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2020-12-23 13:00:58 +05:30 · 2020-12-23 12:50:14 +05:30 · 2020-12-23 12:38:24 +05:30 · 2020-12-23 12:28:11 +05:30 · 2020-11-08 09:58:03 +05:30 · 2020-05-15 16:11:45 +05:30
39 changed files with 3215 additions and 1589 deletions
--- a/.classpath
+++ b/.classpath
@ -1,31 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<classpath>
-	<classpathentry kind="src" output="target/classes" path="src/main/java">
-		<attributes>
-			<attribute name="optional" value="true"/>
-			<attribute name="maven.pomderived" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="src" output="target/test-classes" path="src/test/java">
-		<attributes>
-			<attribute name="optional" value="true"/>
-			<attribute name="maven.pomderived" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry excluding="**" kind="src" output="target/classes" path="src/main/resources">
-		<attributes>
-			<attribute name="maven.pomderived" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.7">
-		<attributes>
-			<attribute name="maven.pomderived" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="con" path="org.eclipse.m2e.MAVEN2_CLASSPATH_CONTAINER">
-		<attributes>
-			<attribute name="maven.pomderived" value="true"/>
-		</attributes>
-	</classpathentry>
-	<classpathentry kind="output" path="target/classes"/>
-</classpath>
--- a/.gitattributes
+++ b/.gitattributes
@ -1,17 +0,0 @@
-# Auto detect text files and perform LF normalization
-* text=auto
-
-# Custom for Visual Studio
-*.cs     diff=csharp
-
-# Standard to msysgit
-*.doc	 diff=astextplain
-*.DOC	 diff=astextplain
-*.docx diff=astextplain
-*.DOCX diff=astextplain
-*.dot  diff=astextplain
-*.DOT  diff=astextplain
-*.pdf  diff=astextplain
-*.PDF	 diff=astextplain
-*.rtf	 diff=astextplain
-*.RTF	 diff=astextplain
--- a/.gitignore
+++ b/.gitignore
@ -21,3 +21,9 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 /target/
+
+# Intellij
+.idea/
+target/
+*.iws
+*.iml
--- a/.project
+++ b/.project
@ -1,29 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<projectDescription>
-	<name>tomcat-cluster-redis-session-manager</name>
-	<comment></comment>
-	<projects>
-	</projects>
-	<buildSpec>
-		<buildCommand>
-			<name>org.eclipse.wst.common.project.facet.core.builder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.jdt.core.javabuilder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-		<buildCommand>
-			<name>org.eclipse.m2e.core.maven2Builder</name>
-			<arguments>
-			</arguments>
-		</buildCommand>
-	</buildSpec>
-	<natures>
-		<nature>org.eclipse.jdt.core.javanature</nature>
-		<nature>org.eclipse.m2e.core.maven2Nature</nature>
-		<nature>org.eclipse.wst.common.project.facet.core.nature</nature>
-	</natures>
-</projectDescription>
--- a/LICENSE.md
+++ b/LICENSE.md
@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
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+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -1,21 +1,43 @@
 # Tomcat Clustering Redis Session Manager

-Redis session manager is pluggable one. It uses to store sessions into Redis for easy distribution of HTTP Requests across a cluster of Tomcat servers. Sessions are implemented as as non-sticky i.e, each request is forwarded to any server in round-robin manner.
+The Redis session manager is pluggable one. It stores session into Redis for easy distribution of HTTP Requests across a cluster of Tomcat servers.

-The HTTP Requests session setAttribute(name, value) method stores the session into Redis (must be Serializable) immediately and the session getAttribute(name) method request directly from Redis. Also, the inactive sessions has been removed based on the session time-out configuration.
+Here the Sessions are implemented as non-sticky (means, each request can able to go to any server in the cluster, unlike the Apache provided Tomcat clustering setup.)

-It supports, both single redis master and redis cluster based on the RedisDataCache.properties configuration.
+Request Sessions will be stored into Redis immediately (Session attributes must be Serializable), for the use of other servers. When tomcat receives a request from the client, Sessions are loaded directly from Redis.

-Going forward, we no need to enable sticky session (JSESSIONID) in Load balancer.
+Supports Redis default, sentinel and cluster mode, based on the configuration.
+
+Going forward, we no need to enable sticky session (JSESSIONID) in Load Balancer.

 ## Supports:
-   * Apache Tomcat 7
-   * Apache Tomcat 8
-   * Apache Tomcat 9
+   - Apache Tomcat 7
+   - Apache Tomcat 8
+   - Apache Tomcat 9
+   - Apache Tomcat 10

-## Downloads:
-   * [latest version (2.0.2)](https://github.com/ran-jit/tomcat-cluster-redis-session-manager/releases/tag/2.0.2)
-   * [older versions](https://github.com/ran-jit/tomcat-cluster-redis-session-manager/wiki)
+## Downloads: [![Total Downloads](https://img.shields.io/github/downloads/ran-jit/tomcat-cluster-redis-session-manager/total.svg)](https://github.com/ran-jit/tomcat-cluster-redis-session-manager/wiki)
+   - [latest version (4.0)](https://github.com/ran-jit/tomcat-cluster-redis-session-manager/releases/tag/4.0)
+   - [older versions](https://github.com/ran-jit/tomcat-cluster-redis-session-manager/wiki)
+
+<p align="center">
+  <a href="https://www.buymeacoffee.com/ranmanic" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-red.png" alt="Buy Me A Coffee" style="height: 60px !important;width: 217px !important;" ></a>
+</p>
+
+## Maven configuration
+```
+<repository>
+  <id>repsy</id>
+  <name>tomcat-cluster-redis-session-manager-repo</name>
+  <url>https://repo.repsy.io/mvn/ranmanic/tomcat-session-manager</url>
+</repository>
+
+<dependency>
+  <groupId>tomcat-session-manager</groupId>
+  <artifactId>redis</artifactId>
+  <version>4.0</version>
+</dependency>
+```

 #### Pre-requisite:
 1. jedis.jar
@ -26,23 +48,53 @@ more details.. https://github.com/ran-jit/tomcat-cluster-redis-session-manager/w
    

 #### Steps to be done,
-1. Move the downloaded jars to tomcat/lib directory
-	* **tomcat/lib/**
+1. Copy the downloaded jars to your tomcat/lib directory.
+```
+tomcat/lib/
+```
 	
-2. Add tomcat system property "catalina.base"
-	* **catalina.base="TOMCAT_LOCATION"**
+2. Add tomcat system property "catalina.base".
+```
+catalina.base="TOMCAT_LOCATION"
+example: env "catalina.base=/opt/tomcat" bash
+```

-3. Extract downloaded package (tomcat-cluster-redis-session-manager.zip) to configure Redis credentials in redis-data-cache.properties file and move the file to tomcat/conf directory
-	* **tomcat/conf/redis-data-cache.properties**
+3. Copy the redis-data-cache.properties file to your tomcat/conf directory and update your Redis server details.
+```
+tomcat/conf/redis-data-cache.properties
+```

-4. Add the below two lines in tomcat/conf/context.xml
-	* **&#60;Valve className="tomcat.request.session.redis.SessionHandlerValve" &#47;&#62;**
-	* **&#60;Manager className="tomcat.request.session.redis.SessionManager" &#47;&#62;**
+4. Add the below two lines in your tomcat/conf/context.xml file.
+```
+<Valve className="tomcat.request.session.redis.SessionHandlerValve" />
+<Manager className="tomcat.request.session.redis.SessionManager" />
+```

-5. Verify the session expiration time in tomcat/conf/web.xml
-	* **&#60;session-config&#62;**
-	* 	**&#60;session-timeout&#62;60&#60;&#47;session-timeout&#62;**
-	* **&#60;&#47;session-config&#62;**
+5. Verify the session expiration time in tomcat/conf/web.xml file.
+```
+<session-config>
+  <session-timeout>60</session-timeout>
+</session-config>
+```

 ### Note:
-  * This supports, both redis stand-alone and multiple node cluster based on the redis-data-cache.properties configuration.
+  - **All your session attribute values must implement java.io.Serializable.**
+
+### Configuration Properties:
+<html>
+<body>
+    <table border="1px" style="width: 80%;margin-left: 10%;margin-right: 10%;line-height: 1.5;">
+        <tr><th style="width: 30%;">Property</th><th style="width: 50%;">Description</th></tr>
+        <tr><td>redis.hosts</td><td>Redis server running instance IP address and port number<br/>- ex: 127.0.0.1:6379, 127.0.0.2:6379, 127.0.0.2:6380, ..<br/>- default: 127.0.0.1:6379</td></tr>
+        <tr><td>redis.password</td><td>Redis protected password</td></tr>
+        <tr><td>redis.database</td><td>Redis database selection. (Numeric value)<br/>- default: 0</td></tr>
+        <tr><td>redis.timeout</td><td>Redis connection timeout<br/>- default: 2000 ms</td></tr>
+        <tr><td>redis.cluster.enabled</td><td>To enable redis cluster mode<br/>- default: false<br>- supported values: true/false</td></tr>
+        <tr><td>redis.sentinel.enabled</td><td>To enable redis sentinel mode<br/>- default: false<br>- supported values: true/false</td></tr>
+        <tr><td>redis.sentinel.master</td><td>Redis sentinel master name<br/>- default: mymaster</td></tr>
+        <tr><td>lb.sticky-session.enabled</td><td>To enable redis and standard session mode<br><br>If enabled,<ol><li>Must be enabled sticky session in your load balancer configuration. Else this manager may not return the updated session values</li><li>Session values are stored in local jvm and redis</li><li>If redis is down/not responding, requests uses jvm stored session values to process user requests. Redis comes back the values will be synced</li></ol>- default: false</td></tr>
+	    <tr><td>session.persistent.policies</td><td>session persistent policies.<br/><br/>- policies - DEFAULT, SAVE_ON_CHANGE, ALWAYS_SAVE_AFTER_REQUEST <br/><ol><li>SAVE_ON_CHANGE: every time session.setAttribute() or session.removeAttribute() is called the session will be saved.</li><li>ALWAYS_SAVE_AFTER_REQUEST: force saving after every request, regardless of whether or not the manager has detected changes to the session.</li></ol>- default: DEFAULT</td></tr>
+	    <tr><td>redis.sso.timeout</td><td>single-sign-on session timeout.<br/>- default: 0 ms (-no expiry)</td></tr>
+    </table>
+</body>
+</html>
--- a/pom.xml
+++ b/pom.xml
@ -1,68 +1,96 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-	<modelVersion>4.0.0</modelVersion>
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

-	<groupId>tomcat-cluster-redis-session-manager</groupId>
-	<artifactId>tomcat-cluster-redis-session-manager</artifactId>
-	<version>2.0.3</version>
-	<packaging>jar</packaging>
+    <modelVersion>4.0.0</modelVersion>
+    <groupId>tomcat-session-manager</groupId>
+    <artifactId>redis</artifactId>
+    <version>4.0</version>
+    <packaging>jar</packaging>

-	<name>tomcat-cluster-redis-session-manager</name>
-	<url>http://maven.apache.org</url>
+    <name>tomcat-cluster-redis-session-manager</name>
+    <url>https://ranmanic.in</url>

-	<properties>
-		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<java.version>1.7</java.version>
-	</properties>
+    <developers>
+        <developer>
+            <id>ranmanic</id>
+            <name>Ranjith Manickam</name>
+            <email>ranjith@ranmanic.in</email>
+        </developer>
+    </developers>

-	<dependencies>
-		<dependency>
-			<groupId>redis.clients</groupId>
-			<artifactId>jedis</artifactId>
-			<version>2.9.0</version>
-		</dependency>
-		<dependency>
-			<groupId>org.apache.commons</groupId>
-			<artifactId>commons-pool2</artifactId>
-			<version>2.4.2</version>
-		</dependency>
-		<dependency>
-			<groupId>commons-logging</groupId>
-			<artifactId>commons-logging</artifactId>
-			<version>1.2</version>
-		</dependency>
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.7</java.version>

-		<!-- For local development -->
-		<!-- <dependency>
-			<groupId>apache-tomcat</groupId>
-			<artifactId>catalina</artifactId>
-			<version>apache-tomcat-8.5.20</version>
-		</dependency>
-		<dependency>
-			<groupId>apache-tomcat</groupId>
-			<artifactId>servlet-api</artifactId>
-			<version>apache-tomcat-8.5.20</version>
-		</dependency>
-		<dependency>
-			<groupId>apache-tomcat</groupId>
-			<artifactId>tomcat-api</artifactId>
-			<version>apache-tomcat-8.5.20</version>
-		</dependency> -->
-		<!-- For local development end.. -->
-	</dependencies>
+        <jedis.version>3.0.1</jedis.version>
+        <commons-pool2.version>2.6.2</commons-pool2.version>
+        <slf4j-api.version>1.7.26</slf4j-api.version>

-	<build>
-		<plugins>
-			<plugin>
-				<groupId>org.apache.maven.plugins</groupId>
-				<artifactId>maven-compiler-plugin</artifactId>
-				<version>3.6.1</version>
-				<configuration>
-					<source>1.7</source>
-					<target>1.7</target>
-				</configuration>
-			</plugin>
-		</plugins>
-	</build>
+        <maven-compiler.version>3.6.1</maven-compiler.version>
+        <source-java.version>1.7</source-java.version>
+        <target-java.version>${source-java.version}</target-java.version>
+
+        <!-- For local development properties begins.. -->
+        <tomcat.version>8.5.32</tomcat.version>
+        <!-- For local development properties end.. -->
+    </properties>
+
+    <distributionManagement>
+        <repository>
+            <id>repsy</id>
+            <name>tomcat-cluster-redis-session-manager-repo</name>
+            <url>https://repo.repsy.io/mvn/ranmanic/tomcat-session-manager</url>
+        </repository>
+    </distributionManagement>
+
+    <dependencies>
+        <dependency>
+            <groupId>redis.clients</groupId>
+            <artifactId>jedis</artifactId>
+            <version>${jedis.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-pool2</artifactId>
+            <version>${commons-pool2.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>${slf4j-api.version}</version>
+        </dependency>
+
+        <!-- For local development dependency begins.. -->
+        <dependency>
+            <groupId>org.apache.tomcat</groupId>
+            <artifactId>tomcat-catalina</artifactId>
+            <version>${tomcat.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.tomcat</groupId>
+            <artifactId>tomcat-servlet-api</artifactId>
+            <version>${tomcat.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.tomcat</groupId>
+            <artifactId>tomcat-api</artifactId>
+            <version>${tomcat.version}</version>
+        </dependency>
+        <!-- For local development dependency end.. -->
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler.version}</version>
+                <configuration>
+                    <source>${source-java.version}</source>
+                    <target>${target-java.version}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
 </project>
--- a/src/main/java/tomcat/request/session/SerializationUtil.java
+++ b/src/main/java/tomcat/request/session/SerializationUtil.java
@ -1,112 +0,0 @@
-package tomcat.request.session;
-
-import java.io.BufferedInputStream;
-import java.io.BufferedOutputStream;
-import java.io.ByteArrayInputStream;
-import java.io.ByteArrayOutputStream;
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.security.MessageDigest;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.Map;
-
-import org.apache.catalina.util.CustomObjectInputStream;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Session serialization utility.
- *
- * @author Ranjith Manickam
- * @since 2.0
- */
-public class SerializationUtil {
-
-	private ClassLoader loader;
-
-	private Log log = LogFactory.getLog(SerializationUtil.class);
-
-	/**
-	 * To set class loader
-	 * 
-	 * @param loader
-	 */
-	public void setClassLoader(ClassLoader loader) {
-		this.loader = loader;
-	}
-
-	/**
-	 * To get session attributes hash code
-	 * 
-	 * @param session
-	 * @return
-	 * @throws IOException
-	 */
-	public byte[] getSessionAttributesHashCode(Session session) throws IOException {
-		byte[] serialized = null;
-		Map<String, Object> attributes = new HashMap<String, Object>();
-
-		for (Enumeration<String> enumerator = session.getAttributeNames(); enumerator.hasMoreElements();) {
-			String key = enumerator.nextElement();
-			attributes.put(key, session.getAttribute(key));
-		}
-
-		try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
-				ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(bos));) {
-			oos.writeUnshared(attributes);
-			oos.flush();
-			serialized = bos.toByteArray();
-		}
-
-		MessageDigest digester = null;
-		try {
-			digester = MessageDigest.getInstance("MD5");
-		} catch (Exception ex) {
-			log.error("Unable to get MessageDigest instance for MD5", ex);
-		}
-		return digester.digest(serialized);
-	}
-
-	/**
-	 * To serialize session object
-	 * 
-	 * @param session
-	 * @param metadata
-	 * @return
-	 * @throws IOException
-	 */
-	public byte[] serializeSessionData(Session session, SessionMetadata metadata) throws IOException {
-		byte[] serialized = null;
-		try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
-				ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(bos));) {
-			oos.writeObject(metadata);
-			session.writeObjectData(oos);
-			oos.flush();
-			serialized = bos.toByteArray();
-		}
-		return serialized;
-	}
-
-	/**
-	 * To de-serialize session object
-	 * 
-	 * @param data
-	 * @param session
-	 * @param metadata
-	 * @throws IOException
-	 * @throws ClassNotFoundException
-	 */
-	public void deserializeSessionData(byte[] data, Session session, SessionMetadata metadata)
-			throws IOException, ClassNotFoundException {
-		try (BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(data));
-				ObjectInputStream ois = new CustomObjectInputStream(bis, this.loader);) {
-			SessionMetadata serializedMetadata = (SessionMetadata) ois.readObject();
-			metadata.copyFieldsFrom(serializedMetadata);
-			session.readObjectData(ois);
-		}
-	}
-}
--- a/src/main/java/tomcat/request/session/Session.java
+++ b/src/main/java/tomcat/request/session/Session.java
@ -1,139 +0,0 @@
-package tomcat.request.session;
-
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.security.Principal;
-import java.util.Enumeration;
-import java.util.HashMap;
-import java.util.Map;
-
-import org.apache.catalina.Manager;
-import org.apache.catalina.session.StandardSession;
-
-import tomcat.request.session.redis.SessionManager;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * This class is uses to store and retrieve the HTTP request session objects.
- *
- * @author Ranjith Manickam
- * @since 2.0
- */
-public class Session extends StandardSession {
-
-	private static final long serialVersionUID = -6056744304016869278L;
-
-	protected Boolean dirty;
-
-	protected Map<String, Object> changedAttributes;
-
-	protected static Boolean manualDirtyTrackingSupportEnabled = false;
-
-	protected static String manualDirtyTrackingAttributeKey = "__changed__";
-
-	public Session(Manager manager) {
-		super(manager);
-		resetDirtyTracking();
-	}
-
-	public void resetDirtyTracking() {
-		this.changedAttributes = new HashMap<>();
-		this.dirty = false;
-	}
-
-	public static void setManualDirtyTrackingSupportEnabled(boolean enabled) {
-		manualDirtyTrackingSupportEnabled = enabled;
-	}
-
-	public static void setManualDirtyTrackingAttributeKey(String key) {
-		manualDirtyTrackingAttributeKey = key;
-	}
-
-	public Boolean isDirty() {
-		return this.dirty || !this.changedAttributes.isEmpty();
-	}
-
-	public Map<String, Object> getChangedAttributes() {
-		return this.changedAttributes;
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void setId(String id) {
-		this.id = id;
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void setAttribute(String key, Object value) {
-		if (manualDirtyTrackingSupportEnabled && manualDirtyTrackingAttributeKey.equals(key)) {
-			this.dirty = true;
-			return;
-		}
-
-		Object oldValue = getAttribute(key);
-		super.setAttribute(key, value);
-
-		if ((value != null || oldValue != null)
-				&& (value == null && oldValue != null || oldValue == null && value != null
-						|| !value.getClass().isInstance(oldValue) || !value.equals(oldValue))) {
-			if (this.manager instanceof SessionManager && ((SessionManager) this.manager).getSaveOnChange()) {
-				((SessionManager) this.manager).save(this, true);
-			} else {
-				this.changedAttributes.put(key, value);
-			}
-		}
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public Object getAttribute(String name) {
-		return super.getAttribute(name);
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public Enumeration<String> getAttributeNames() {
-		return super.getAttributeNames();
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void removeAttribute(String name) {
-		super.removeAttribute(name);
-		if (this.manager instanceof SessionManager && ((SessionManager) this.manager).getSaveOnChange()) {
-			((SessionManager) this.manager).save(this, true);
-		} else {
-			this.dirty = true;
-		}
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void setPrincipal(Principal principal) {
-		super.setPrincipal(principal);
-		this.dirty = true;
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void writeObjectData(ObjectOutputStream out) throws IOException {
-		super.writeObjectData(out);
-		out.writeLong(this.getCreationTime());
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void readObjectData(ObjectInputStream in) throws IOException, ClassNotFoundException {
-		super.readObjectData(in);
-		this.setCreationTime(in.readLong());
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public void invalidate() {
-		super.invalidate();
-	}
-}
--- a/src/main/java/tomcat/request/session/SessionConstants.java
+++ b/src/main/java/tomcat/request/session/SessionConstants.java
@ -1,18 +0,0 @@
-package tomcat.request.session;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Session constants.
- * 
- * @author Ranjith Manickam
- * @since 2.0
- */
-public class SessionConstants {
-
-	public static final byte[] NULL_SESSION = "null".getBytes();
-
-	public static final String CATALINA_BASE = "catalina.base";
-
-	public static final String CONF = "conf";
-}
--- a/src/main/java/tomcat/request/session/SessionContext.java
+++ b/src/main/java/tomcat/request/session/SessionContext.java
@ -1,99 +0,0 @@
-package tomcat.request.session;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Session context uses to manage current session data.
- * 
- * @author Ranjith Manickam
- * @since 2.0
- */
-public class SessionContext {
-
-	private String id;
-
-	private Session session;
-
-	private boolean persisted;
-
-	private SessionMetadata metadata;
-
-	/**
-	 * To get session id
-	 * 
-	 * @return
-	 */
-	public String getId() {
-		return id;
-	}
-
-	/**
-	 * To set session id
-	 * 
-	 * @param id
-	 */
-	public void setId(String id) {
-		this.id = id;
-	}
-
-	/**
-	 * To get session
-	 * 
-	 * @return
-	 */
-	public Session getSession() {
-		return session;
-	}
-
-	/**
-	 * To set session
-	 * 
-	 * @param session
-	 */
-	public void setSession(Session session) {
-		this.session = session;
-	}
-
-	/**
-	 * To check session is persisted
-	 * 
-	 * @return
-	 */
-	public boolean isPersisted() {
-		return persisted;
-	}
-
-	/**
-	 * To set session persisted
-	 * 
-	 * @param persisted
-	 */
-	public void setPersisted(boolean persisted) {
-		this.persisted = persisted;
-	}
-
-	/**
-	 * To get session meta-data
-	 * 
-	 * @return
-	 */
-	public SessionMetadata getMetadata() {
-		return metadata;
-	}
-
-	/**
-	 * To set session meta-data
-	 * 
-	 * @param metadata
-	 */
-	public void setMetadata(SessionMetadata metadata) {
-		this.metadata = metadata;
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public String toString() {
-		return "SessionContext [id=" + id + "]";
-	}
-
-}
--- a/src/main/java/tomcat/request/session/SessionMetadata.java
+++ b/src/main/java/tomcat/request/session/SessionMetadata.java
@ -1,78 +0,0 @@
-package tomcat.request.session;
-
-import java.io.IOException;
-import java.io.ObjectInputStream;
-import java.io.ObjectOutputStream;
-import java.io.Serializable;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * This class is uses to store and retrieve the HTTP request session object
- * meta-data.
- *
- * @author Ranjith Manickam
- * @since 2.0
- */
-public class SessionMetadata implements Serializable {
-
-	private static final long serialVersionUID = 124438185184833546L;
-
-	private byte[] attributesHash;
-
-	public SessionMetadata() {
-		this.attributesHash = new byte[0];
-	}
-
-	/**
-	 * To get session meta-data hash
-	 * 
-	 * @return
-	 */
-	public byte[] getAttributesHash() {
-		return this.attributesHash;
-	}
-
-	/**
-	 * To set session meta-data hash
-	 * 
-	 * @param attributesHash
-	 */
-	public void setAttributesHash(byte[] attributesHash) {
-		this.attributesHash = attributesHash;
-	}
-
-	/**
-	 * To copy session meta-data
-	 * 
-	 * @param metadata
-	 */
-	public void copyFieldsFrom(SessionMetadata metadata) {
-		this.setAttributesHash(metadata.getAttributesHash());
-	}
-
-	/**
-	 * To write session meta-data to output stream
-	 * 
-	 * @param out
-	 * @throws IOException
-	 */
-	private void writeObject(ObjectOutputStream out) throws IOException {
-		out.writeInt(this.attributesHash.length);
-		out.write(this.attributesHash);
-	}
-
-	/**
-	 * To read session meta-data from input stream
-	 * 
-	 * @param in
-	 * @throws IOException
-	 * @throws ClassNotFoundException
-	 */
-	private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
-		int hashLength = in.readInt();
-		byte[] attributesHash = new byte[hashLength];
-		in.read(attributesHash, 0, hashLength);
-		this.attributesHash = attributesHash;
-	}
-}
--- a/src/main/java/tomcat/request/session/annotation/Property.java
+++ b/src/main/java/tomcat/request/session/annotation/Property.java
@ -0,0 +1,24 @@
+package tomcat.request.session.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/** author: Ranjith Manickam @ 5 Feb' 2020 */
+@Target(ElementType.FIELD)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface Property {
+    String name() default "";
+
+    String defaultValue() default "";
+
+    PropertyType type() default PropertyType.STRING;
+
+    enum PropertyType {
+        STRING,
+        BOOLEAN,
+        INTEGER,
+        LONG
+    }
+}
--- a/src/main/java/tomcat/request/session/constant/SessionConstants.java
+++ b/src/main/java/tomcat/request/session/constant/SessionConstants.java
@ -0,0 +1,19 @@
+package tomcat.request.session.constant;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+public interface SessionConstants {
+    byte[] NULL_SESSION = "null".getBytes();
+
+    enum SessionPolicy {
+        DEFAULT, SAVE_ON_CHANGE, ALWAYS_SAVE_AFTER_REQUEST;
+
+        public static SessionPolicy fromName(String name) {
+            for (SessionPolicy policy : SessionPolicy.values()) {
+                if (policy.name().equalsIgnoreCase(name)) {
+                    return policy;
+                }
+            }
+            throw new IllegalArgumentException("Invalid session policy [" + name + "]");
+        }
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/DataCache.java
+++ b/src/main/java/tomcat/request/session/data/cache/DataCache.java
@ -1,58 +1,56 @@
 package tomcat.request.session.data.cache;

-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * API for Data cache.
- *
- * @author Ranjith Manickam
- * @since 2.0
- */
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
 public interface DataCache {

-	/**
-	 * To set value in data-cache
-	 * 
-	 * @param key
-	 * @param value
-	 * @return
-	 */
-	byte[] set(String key, byte[] value);
+    /**
+     * Set value in data-cache.
+     *
+     * @param key   - key with which the specified value is to be associated.
+     * @param value - value to be associated with the specified key.
+     * @return - Returns the value.
+     */
+    byte[] set(String key, byte[] value);

-	/**
-	 * To set value if key not exists in data-cache
-	 * 
-	 * Returns If key exists = 0 else 1
-	 * 
-	 * @param key
-	 * @param value
-	 * @return
-	 */
-	Long setnx(String key, byte[] value);
+    /**
+     * Set value if key not exists in data-cache.
+     *
+     * @param key   - key with which the specified value is to be associated.
+     * @param value - value to be associated with the specified key.
+     * @return - Returns '0' if key already exists else '1'.
+     */
+    Long setnx(String key, byte[] value);

-	/**
-	 * To expire the value based on key in data-cache
-	 * 
-	 * @param key
-	 * @param seconds
-	 * @return
-	 */
-	Long expire(String key, int seconds);
+    /**
+     * Set expiry in data-cache.
+     *
+     * @param key     - key with which the specified value is to be associated.
+     * @param seconds - expiration time in seconds.
+     * @return - Returns the expiration time in seconds.
+     */
+    Long expire(String key, int seconds);

-	/**
-	 * To get the value based on key from data-cache
-	 * 
-	 * @param key
-	 * @return
-	 */
-	byte[] get(String key);
+    /**
+     * Get value from data-cache.
+     *
+     * @param key - key with which the specified value is to be associated.
+     * @return - Returns the value.
+     */
+    byte[] get(String key);

-	/**
-	 * To delete the value based on key from data-cache
-	 * 
-	 * @param key
-	 * @return
-	 */
-	Long delete(String key);
+    /**
+     * Delete value from data-cache.
+     *
+     * @param key - key with which the specified value is to be associated.
+     * @return - Returns the number of keys that were removed.
+     */
+    Long delete(String key);

+    /**
+     * Check the key exists in data-cache.
+     *
+     * @param key - key with which the specified value is to be associated.
+     * @return - Returns true, if the key exists.
+     */
+    Boolean exists(String key);
 }
--- a/src/main/java/tomcat/request/session/data/cache/DataCacheFactory.java
+++ b/src/main/java/tomcat/request/session/data/cache/DataCacheFactory.java
@ -0,0 +1,25 @@
+package tomcat.request.session.data.cache;
+
+import tomcat.request.session.data.cache.impl.StandardDataCache;
+import tomcat.request.session.data.cache.impl.redis.RedisCache;
+import tomcat.request.session.model.Config;
+
+/** author: Ranjith Manickam @ 3 Dec' 2018 */
+public class DataCacheFactory {
+
+    private final Config config;
+    private final int sessionExpiryTime;
+
+    public DataCacheFactory(Config config, int sessionExpiryTime) {
+        this.config = config;
+        this.sessionExpiryTime = sessionExpiryTime;
+    }
+
+    /** To get data cache. */
+    public DataCache getDataCache() {
+        if (this.config.getLbStickySessionEnabled()) {
+            return new StandardDataCache(this.config, this.sessionExpiryTime);
+        }
+        return new RedisCache(this.config);
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/impl/RedisConstants.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/RedisConstants.java
@ -1,45 +0,0 @@
-package tomcat.request.session.data.cache.impl;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Redis data-cache constants.
- * 
- * @author Ranjith Manickam
- * @since 2.0
- */
-interface RedisConstants {
-
-	// redis properties file name
-	final String PROPERTIES_FILE = "redis-data-cache.properties";
-
-	// redis properties
-	final String HOSTS = "redis.hosts";
-	final String CLUSTER_ENABLED = "redis.cluster.enabled";
-
-	final String MAX_ACTIVE = "redis.max.active";
-	final String TEST_ONBORROW = "redis.test.onBorrow";
-	final String TEST_ONRETURN = "redis.test.onReturn";
-	final String MAX_IDLE = "redis.max.idle";
-	final String MIN_IDLE = "redis.min.idle";
-	final String TEST_WHILEIDLE = "redis.test.whileIdle";
-	final String TEST_NUMPEREVICTION = "redis.test.numPerEviction";
-	final String TIME_BETWEENEVICTION = "redis.time.betweenEviction";
-
-	final String PASSWORD = "redis.password";
-	final String DATABASE = "redis.database";
-	final String TIMEOUT = "redis.timeout";
-
-	// redis property default values
-	final String DEFAULT_MAX_ACTIVE_VALUE = "10";
-	final String DEFAULT_TEST_ONBORROW_VALUE = "true";
-	final String DEFAULT_TEST_ONRETURN_VALUE = "true";
-	final String DEFAULT_MAX_IDLE_VALUE = "5";
-	final String DEFAULT_MIN_IDLE_VALUE = "1";
-	final String DEFAULT_TEST_WHILEIDLE_VALUE = "true";
-	final String DEFAULT_TEST_NUMPEREVICTION_VALUE = "10";
-	final String DEFAULT_TIME_BETWEENEVICTION_VALUE = "60000";
-	final String DEFAULT_CLUSTER_ENABLED = "false";
-
-	final String CONN_FAILED_RETRY_MSG = "Jedis connection failed, retrying...";
-}
--- a/src/main/java/tomcat/request/session/data/cache/impl/RedisDataCache.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/RedisDataCache.java
@ -1,493 +0,0 @@
-package tomcat.request.session.data.cache.impl;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.Serializable;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Properties;
-import java.util.Set;
-
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
-import redis.clients.jedis.HostAndPort;
-import redis.clients.jedis.Jedis;
-import redis.clients.jedis.JedisCluster;
-import redis.clients.jedis.JedisPool;
-import redis.clients.jedis.JedisPoolConfig;
-import redis.clients.jedis.Protocol;
-import redis.clients.jedis.exceptions.JedisClusterMaxRedirectionsException;
-import redis.clients.jedis.exceptions.JedisConnectionException;
-import tomcat.request.session.SessionConstants;
-import tomcat.request.session.data.cache.DataCache;
-
-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Redis data-cache implementation to store/retrieve session objects.
- * 
- * @author Ranjith Manickam
- * @since 2.0
- */
-public class RedisDataCache implements DataCache {
-
-	private static DataCache dataCache;
-
-	private Log log = LogFactory.getLog(RedisDataCache.class);
-
-	public RedisDataCache() {
-		initialize();
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public byte[] set(String key, byte[] value) {
-		return dataCache.set(key, value);
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public Long setnx(String key, byte[] value) {
-		return dataCache.setnx(key, value);
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public Long expire(String key, int seconds) {
-		return dataCache.expire(key, seconds);
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public byte[] get(String key) {
-		return (key != null) ? dataCache.get(key) : null;
-	}
-
-	/** {@inheritDoc} */
-	@Override
-	public Long delete(String key) {
-		return dataCache.delete(key);
-	}
-
-	/**
-	 * To parse data-cache key
-	 * 
-	 * @param key
-	 * @return
-	 */
-	public static String parseDataCacheKey(String key) {
-		return key.replaceAll("\\s", "_");
-	}
-
-	/**
-	 * To initialize the data-cache
-	 * 
-	 * @param properties
-	 * @param filePath
-	 */
-	@SuppressWarnings("unchecked")
-	private void initialize() {
-		if (dataCache != null) {
-			return;
-		}
-		Properties properties = loadProperties();
-
-		boolean clusterEnabled = Boolean.valueOf(properties.getProperty(RedisConstants.CLUSTER_ENABLED, RedisConstants.DEFAULT_CLUSTER_ENABLED));
-
-		String hosts = properties.getProperty(RedisConstants.HOSTS, Protocol.DEFAULT_HOST.concat(":").concat(String.valueOf(Protocol.DEFAULT_PORT)));
-		Collection<? extends Serializable> nodes = getJedisNodes(hosts, clusterEnabled);
-
-		String password = properties.getProperty(RedisConstants.PASSWORD);
-		password = (password != null && !password.isEmpty()) ? password : null;
-
-		int database = Integer.parseInt(properties.getProperty(RedisConstants.DATABASE, String.valueOf(Protocol.DEFAULT_DATABASE)));
-
-		int timeout = Integer.parseInt(properties.getProperty(RedisConstants.TIMEOUT, String.valueOf(Protocol.DEFAULT_TIMEOUT)));
-		timeout = (timeout < Protocol.DEFAULT_TIMEOUT) ? Protocol.DEFAULT_TIMEOUT : timeout;
-
-		if (clusterEnabled) {
-			dataCache = new RedisClusterCacheUtil((Set<HostAndPort>) nodes, password, timeout, getPoolConfig(properties));
-		} else {
-			dataCache = new RedisCacheUtil(((List<String>) nodes).get(0),
-					Integer.parseInt(((List<String>) nodes).get(1)), password, database, timeout, getPoolConfig(properties));
-		}
-	}
-
-	/**
-	 * To get jedis pool configuration
-	 * 
-	 * @param properties
-	 * @return
-	 */
-	private JedisPoolConfig getPoolConfig(Properties properties) {
-		JedisPoolConfig poolConfig = new JedisPoolConfig();
-		int maxActive = Integer.parseInt(properties.getProperty(RedisConstants.MAX_ACTIVE, RedisConstants.DEFAULT_MAX_ACTIVE_VALUE));
-		poolConfig.setMaxTotal(maxActive);
-
-		boolean testOnBorrow = Boolean.parseBoolean(properties.getProperty(RedisConstants.TEST_ONBORROW, RedisConstants.DEFAULT_TEST_ONBORROW_VALUE));
-		poolConfig.setTestOnBorrow(testOnBorrow);
-
-		boolean testOnReturn = Boolean.parseBoolean(properties.getProperty(RedisConstants.TEST_ONRETURN, RedisConstants.DEFAULT_TEST_ONRETURN_VALUE));
-		poolConfig.setTestOnReturn(testOnReturn);
-
-		int maxIdle = Integer.parseInt(properties.getProperty(RedisConstants.MAX_ACTIVE, RedisConstants.DEFAULT_MAX_ACTIVE_VALUE));
-		poolConfig.setMaxIdle(maxIdle);
-
-		int minIdle = Integer.parseInt(properties.getProperty(RedisConstants.MIN_IDLE, RedisConstants.DEFAULT_MIN_IDLE_VALUE));
-		poolConfig.setMinIdle(minIdle);
-
-		boolean testWhileIdle = Boolean.parseBoolean(properties.getProperty(RedisConstants.TEST_WHILEIDLE, RedisConstants.DEFAULT_TEST_WHILEIDLE_VALUE));
-		poolConfig.setTestWhileIdle(testWhileIdle);
-
-		int testNumPerEviction = Integer.parseInt(properties.getProperty(RedisConstants.TEST_NUMPEREVICTION, RedisConstants.DEFAULT_TEST_NUMPEREVICTION_VALUE));
-		poolConfig.setNumTestsPerEvictionRun(testNumPerEviction);
-
-		long timeBetweenEviction = Long.parseLong(properties.getProperty(RedisConstants.TIME_BETWEENEVICTION, RedisConstants.DEFAULT_TIME_BETWEENEVICTION_VALUE));
-		poolConfig.setTimeBetweenEvictionRunsMillis(timeBetweenEviction);
-		return poolConfig;
-	}
-
-	/**
-	 * To get jedis nodes
-	 * 
-	 * @param hosts
-	 * @param clusterEnabled
-	 * @return
-	 */
-	private Collection<? extends Serializable> getJedisNodes(String hosts, boolean clusterEnabled) {
-		hosts = hosts.replaceAll("\\s", "");
-		String[] hostPorts = hosts.split(",");
-
-		List<String> node = null;
-		Set<HostAndPort> nodes = null;
-
-		for (String hostPort : hostPorts) {
-			String[] hostPortArr = hostPort.split(":");
-
-			if (clusterEnabled) {
-				nodes = (nodes == null) ? new HashSet<HostAndPort>() : nodes;
-				nodes.add(new HostAndPort(hostPortArr[0], Integer.valueOf(hostPortArr[1])));
-			} else {
-				int port = Integer.valueOf(hostPortArr[1]);
-				if (!hostPortArr[0].isEmpty() && port > 0) {
-					node = (node == null) ? new ArrayList<String>() : node;
-					node.add(hostPortArr[0]);
-					node.add(String.valueOf(port));
-					break;
-				}
-			}
-		}
-		return clusterEnabled ? nodes : node;
-	}
-
-	/**
-	 * To load data-cache properties
-	 * 
-	 * @param filePath
-	 * @return
-	 */
-	private Properties loadProperties() {
-		Properties properties = new Properties();
-		try {
-			String filePath = System.getProperty(SessionConstants.CATALINA_BASE).concat(File.separator)
-					.concat(SessionConstants.CONF).concat(File.separator).concat(RedisConstants.PROPERTIES_FILE);
-
-			InputStream resourceStream = null;
-			try {
-				resourceStream = (filePath != null && !filePath.isEmpty() && new File(filePath).exists())
-						? new FileInputStream(filePath) : null;
-
-				if (resourceStream == null) {
-					ClassLoader loader = Thread.currentThread().getContextClassLoader();
-					resourceStream = loader.getResourceAsStream(RedisConstants.PROPERTIES_FILE);
-				}
-				properties.load(resourceStream);
-			} finally {
-				resourceStream.close();
-			}
-		} catch (IOException ex) {
-			log.error("Error while loading task scheduler properties", ex);
-		}
-		return properties;
-	}
-
-	/**
-	 * Tomcat clustering with Redis data-cache implementation.
-	 * 
-	 * Redis stand-alone mode data-cache implementation.
-	 * 
-	 * @author Ranjith Manickam
-	 * @since 2.0
-	 */
-	private class RedisCacheUtil implements DataCache {
-
-		private JedisPool pool;
-
-		private static final int NUM_RETRIES = 3;
-
-		private Log log = LogFactory.getLog(RedisCacheUtil.class);
-
-		public RedisCacheUtil(String host, int port, String password, int database, int timeout,
-				JedisPoolConfig poolConfig) {
-			pool = new JedisPool(poolConfig, host, port, timeout, password, database);
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public byte[] set(String key, byte[] value) {
-			int tries = 0;
-			boolean sucess = false;
-			String retVal = null;
-			do {
-				tries++;
-				try {
-					Jedis jedis = pool.getResource();
-					retVal = jedis.set(key.getBytes(), value);
-					jedis.close();
-					sucess = true;
-				} catch (JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES)
-						throw ex;
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return (retVal != null) ? retVal.getBytes() : null;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public Long setnx(String key, byte[] value) {
-			int tries = 0;
-			boolean sucess = false;
-			Long retVal = null;
-			do {
-				tries++;
-				try {
-					Jedis jedis = pool.getResource();
-					retVal = jedis.setnx(key.getBytes(), value);
-					jedis.close();
-					sucess = true;
-				} catch (JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES)
-						throw ex;
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public Long expire(String key, int seconds) {
-			int tries = 0;
-			boolean sucess = false;
-			Long retVal = null;
-			do {
-				tries++;
-				try {
-					Jedis jedis = pool.getResource();
-					retVal = jedis.expire(key, seconds);
-					jedis.close();
-					sucess = true;
-				} catch (JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES)
-						throw ex;
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public byte[] get(String key) {
-			int tries = 0;
-			boolean sucess = false;
-			byte[] retVal = null;
-			do {
-				tries++;
-				try {
-					Jedis jedis = pool.getResource();
-					retVal = jedis.get(key.getBytes());
-					jedis.close();
-					sucess = true;
-				} catch (JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES)
-						throw ex;
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public Long delete(String key) {
-			int tries = 0;
-			boolean sucess = false;
-			Long retVal = null;
-			do {
-				tries++;
-				try {
-					Jedis jedis = pool.getResource();
-					retVal = jedis.del(key);
-					jedis.close();
-					sucess = true;
-				} catch (JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES)
-						throw ex;
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-	}
-
-	/**
-	 * Tomcat clustering with Redis data-cache implementation.
-	 * 
-	 * Redis multiple node cluster data-cache implementation.
-	 * 
-	 * @author Ranjith Manickam
-	 * @since 2.0
-	 */
-	private class RedisClusterCacheUtil implements DataCache {
-
-		private JedisCluster cluster;
-
-		private static final int NUM_RETRIES = 30;
-		private static final int DEFAULT_MAX_REDIRECTIONS = 5;
-
-		private Log log = LogFactory.getLog(RedisClusterCacheUtil.class);
-
-		public RedisClusterCacheUtil(Set<HostAndPort> nodes, String password, int timeout, JedisPoolConfig poolConfig) {
-			cluster = new JedisCluster(nodes, timeout, Protocol.DEFAULT_TIMEOUT, DEFAULT_MAX_REDIRECTIONS, password, poolConfig);
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public byte[] set(String key, byte[] value) {
-			int tries = 0;
-			boolean sucess = false;
-			String retVal = null;
-			do {
-				tries++;
-				try {
-					retVal = cluster.set(key.getBytes(), value);
-					sucess = true;
-				} catch (JedisClusterMaxRedirectionsException | JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES) {
-						throw ex;
-					}
-					waitforFailover();
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return (retVal != null) ? retVal.getBytes() : null;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public Long setnx(String key, byte[] value) {
-			int tries = 0;
-			boolean sucess = false;
-			Long retVal = null;
-			do {
-				tries++;
-				try {
-					retVal = cluster.setnx(key.getBytes(), value);
-					sucess = true;
-				} catch (JedisClusterMaxRedirectionsException | JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES) {
-						throw ex;
-					}
-					waitforFailover();
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public Long expire(String key, int seconds) {
-			int tries = 0;
-			boolean sucess = false;
-			Long retVal = null;
-			do {
-				tries++;
-				try {
-					retVal = cluster.expire(key, seconds);
-					sucess = true;
-				} catch (JedisClusterMaxRedirectionsException | JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES) {
-						throw ex;
-					}
-					waitforFailover();
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public byte[] get(String key) {
-			int tries = 0;
-			boolean sucess = false;
-			byte[] retVal = null;
-			do {
-				tries++;
-				try {
-					retVal = cluster.get(key.getBytes());
-					sucess = true;
-				} catch (JedisClusterMaxRedirectionsException | JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES) {
-						throw ex;
-					}
-					waitforFailover();
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/** {@inheritDoc} */
-		@Override
-		public Long delete(String key) {
-			int tries = 0;
-			boolean sucess = false;
-			Long retVal = null;
-			do {
-				tries++;
-				try {
-					retVal = cluster.del(key);
-					sucess = true;
-				} catch (JedisClusterMaxRedirectionsException | JedisConnectionException ex) {
-					log.error(RedisConstants.CONN_FAILED_RETRY_MSG + tries);
-					if (tries == NUM_RETRIES) {
-						throw ex;
-					}
-					waitforFailover();
-				}
-			} while (!sucess && tries <= NUM_RETRIES);
-			return retVal;
-		}
-
-		/**
-		 * To wait for handling redis fail-over
-		 */
-		private void waitforFailover() {
-			try {
-				Thread.sleep(4000);
-			} catch (InterruptedException ex) {
-				Thread.currentThread().interrupt();
-			}
-		}
-	}
-}
--- a/src/main/java/tomcat/request/session/data/cache/impl/StandardDataCache.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/StandardDataCache.java
@ -0,0 +1,229 @@
+package tomcat.request.session.data.cache.impl;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import tomcat.request.session.data.cache.DataCache;
+import tomcat.request.session.data.cache.impl.redis.RedisCache;
+import tomcat.request.session.model.Config;
+
+import java.io.Serializable;
+import java.util.Date;
+import java.util.Map;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executor;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+
+/** author: Ranjith Manickam @ 3 Dec' 2018 */
+public class StandardDataCache extends RedisCache {
+
+    private boolean processDataSync;
+
+    private long expiryJob;
+    private long dataSyncJob;
+
+    private final int sessionExpiryTime;
+    private final long expiryJobTriggerInterval;
+    private final long dataSyncJobTriggerInterval;
+    private final Map<String, SessionData> sessionData;
+
+    private final Executor expiryJobExecutor;
+    private final Executor dataSyncJobExecutor;
+
+    public StandardDataCache(Config config, int sessionExpiryTime) {
+        super(config);
+        this.sessionExpiryTime = sessionExpiryTime;
+        this.sessionData = new ConcurrentHashMap<>();
+        this.expiryJob = new Date().getTime();
+        this.dataSyncJob = new Date().getTime();
+        this.processDataSync = false;
+        this.expiryJobTriggerInterval = TimeUnit.MINUTES.toMillis(config.getRedisSessionExpiryJobInterval());
+        this.dataSyncJobTriggerInterval = TimeUnit.MINUTES.toMillis(config.getRedisSessionDataSyncJobInterval());
+        this.expiryJobExecutor = Executors.newSingleThreadExecutor();
+        this.dataSyncJobExecutor = Executors.newSingleThreadExecutor();
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] set(String key, byte[] value) {
+        this.sessionData.put(key, new SessionData(value));
+        try {
+            return super.set(key, value);
+        } catch (RuntimeException ex) {
+            this.processDataSync = true;
+        }
+        return value;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long setnx(String key, byte[] value) {
+        Long retValue;
+        try {
+            retValue = super.setnx(key, value);
+        } catch (RuntimeException ex) {
+            retValue = this.sessionData.containsKey(key) ? 0L : 1L;
+            this.processDataSync = true;
+        }
+
+        if (retValue == 1L) {
+            this.sessionData.put(key, new SessionData(value));
+        }
+        return retValue;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long expire(String key, int seconds) {
+        try {
+            return super.expire(key, seconds);
+        } catch (RuntimeException ex) {
+            this.processDataSync = true;
+        }
+        return null;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] get(String key) {
+        handleSessionData();
+        if (this.sessionData.containsKey(key)) {
+            return this.sessionData.get(key).getValue();
+        }
+        try {
+            return super.get(key);
+        } catch (RuntimeException ex) {
+            this.processDataSync = true;
+            throw ex;
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long delete(String key) {
+        Object value = this.sessionData.remove(key);
+        try {
+            return super.delete(key);
+        } catch (RuntimeException ex) {
+            this.processDataSync = true;
+        }
+        return (value == null) ? 0L : 1L;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Boolean exists(String key) {
+        return this.sessionData.containsKey(key);
+    }
+
+    /** Session data. */
+    private static class SessionData implements Serializable {
+        private byte[] value;
+        private long lastAccessedOn;
+
+        SessionData(byte[] value) {
+            this.value = value;
+            updatedLastAccessedOn();
+        }
+
+        void updatedLastAccessedOn() {
+            this.lastAccessedOn = new Date().getTime();
+        }
+
+        byte[] getValue() {
+            updatedLastAccessedOn();
+            return this.value;
+        }
+
+        long getLastAccessedOn() {
+            return this.lastAccessedOn;
+        }
+    }
+
+    /** To handle session data. */
+    private synchronized void handleSessionData() {
+        // redis sync
+        long now = new Date().getTime();
+
+        long difference = now - this.dataSyncJob;
+        if (this.processDataSync && difference >= this.dataSyncJobTriggerInterval) {
+            this.dataSyncJobExecutor.execute(new SessionDataSyncThread(this, this.sessionData, this.sessionExpiryTime));
+            this.dataSyncJob = (this.processDataSync) ? new Date().getTime() : this.dataSyncJob;
+            this.processDataSync = false;
+        }
+
+        // session expiry
+        difference = now - this.expiryJob;
+        if (difference >= this.expiryJobTriggerInterval) {
+            this.expiryJobExecutor.execute(new SessionDataExpiryThread(this.sessionData, this.sessionExpiryTime));
+            this.expiryJob = new Date().getTime();
+        }
+    }
+
+    /** Session data redis sync thread. */
+    private static class SessionDataSyncThread implements Runnable {
+
+        private final Logger LOGGER = LoggerFactory.getLogger(SessionDataSyncThread.class);
+
+        private final DataCache dataCache;
+        private final int sessionExpiryTime;
+        private final Map<String, SessionData> sessionData;
+
+        SessionDataSyncThread(DataCache dataCache, Map<String, SessionData> sessionData, int sessionExpiryTime) {
+            this.dataCache = dataCache;
+            this.sessionData = sessionData;
+            this.sessionExpiryTime = sessionExpiryTime;
+        }
+
+        /** {@inheritDoc} */
+        @Override
+        public void run() {
+            try {
+                for (String key : this.sessionData.keySet()) {
+                    SessionData data = this.sessionData.get(key);
+                    if (data == null) {
+                        continue;
+                    }
+                    this.dataCache.set(key, data.getValue());
+                    this.dataCache.expire(key, this.sessionExpiryTime);
+                }
+            } catch (Exception ex) {
+                LOGGER.error("Error processing session data expiry thread", ex);
+            }
+        }
+    }
+
+    /** Session data expiry thread. This will takes care of the session expired data removal. */
+    private static class SessionDataExpiryThread implements Runnable {
+
+        private final Logger LOGGER = LoggerFactory.getLogger(SessionDataExpiryThread.class);
+
+        private final long expiry;
+        private final Map<String, SessionData> sessionData;
+
+        SessionDataExpiryThread(Map<String, SessionData> sessionData, int sessionExpiryTime) {
+            this.sessionData = sessionData;
+            this.expiry = TimeUnit.SECONDS.toMillis(sessionExpiryTime + 60);
+        }
+
+        /** {@inheritDoc} */
+        @Override
+        public void run() {
+            try {
+                for (String key : this.sessionData.keySet()) {
+                    SessionData data = this.sessionData.get(key);
+                    if (data == null) {
+                        continue;
+                    }
+
+                    long difference = new Date().getTime() - data.getLastAccessedOn();
+                    if (difference >= this.expiry) {
+                        this.sessionData.remove(key);
+                    }
+                }
+            } catch (Exception ex) {
+                LOGGER.error("Error processing session data expiry thread", ex);
+            }
+        }
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisCache.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisCache.java
@ -0,0 +1,145 @@
+package tomcat.request.session.data.cache.impl.redis;
+
+import redis.clients.jedis.HostAndPort;
+import redis.clients.jedis.JedisPoolConfig;
+import tomcat.request.session.data.cache.DataCache;
+import tomcat.request.session.model.Config;
+import tomcat.request.session.model.Config.RedisConfigType;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Set;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+public class RedisCache implements DataCache {
+
+    private DataCache dataCache;
+
+    public RedisCache(Config config) {
+        initialize(config);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] set(String key, byte[] value) {
+        return this.dataCache.set(key, value);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long setnx(String key, byte[] value) {
+        return this.dataCache.setnx(key, value);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long expire(String key, int seconds) {
+        return this.dataCache.expire(key, seconds);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] get(String key) {
+        return this.dataCache.get(key);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long delete(String key) {
+        return this.dataCache.delete(key);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Boolean exists(String key) {
+        return this.dataCache.exists(key);
+    }
+
+    private void initialize(Config config) {
+        Collection<?> nodes = getJedisNodes(config.getRedisHosts(), config.getRedisConfigType());
+        JedisPoolConfig poolConfig = getPoolConfig(config);
+        switch (config.getRedisConfigType()) {
+            case CLUSTER:
+                this.dataCache = new RedisClusterManager((Set<HostAndPort>) nodes,
+                        config.getRedisPassword(),
+                        config.getRedisTimeout(),
+                        poolConfig);
+                break;
+            case SENTINEL:
+                this.dataCache = new RedisSentinelManager((Set<String>) nodes,
+                        config.getRedisSentinelMaster(),
+                        config.getRedisPassword(),
+                        config.getRedisDatabase(),
+                        config.getRedisTimeout(),
+                        poolConfig);
+                break;
+            default:
+                this.dataCache = new RedisStandardManager(((List<String>) nodes).get(0),
+                        Integer.parseInt(((List<String>) nodes).get(1)),
+                        config.getRedisPassword(),
+                        config.getRedisDatabase(),
+                        config.getRedisTimeout(),
+                        poolConfig);
+                break;
+        }
+    }
+
+    /**
+     * To get redis pool config.
+     *
+     * @param config - Application config.
+     * @return - Returns the redis pool config.
+     */
+    private JedisPoolConfig getPoolConfig(Config config) {
+        JedisPoolConfig poolConfig = new JedisPoolConfig();
+        poolConfig.setMaxTotal(config.getRedisMaxActive());
+        poolConfig.setTestOnBorrow(config.getRedisTestOnBorrow());
+        poolConfig.setTestOnReturn(config.getRedisTestOnReturn());
+        poolConfig.setMaxIdle(config.getRedisMaxIdle());
+        poolConfig.setMinIdle(config.getRedisMinIdle());
+        poolConfig.setTestWhileIdle(config.getRedisTestWhileIdle());
+        poolConfig.setNumTestsPerEvictionRun(config.getRedisTestNumPerEviction());
+        poolConfig.setTimeBetweenEvictionRunsMillis(config.getRedisTimeBetweenEviction());
+        return poolConfig;
+    }
+
+    /**
+     * To get redis data cache nodes.
+     *
+     * @param hosts      - redis server hosts.
+     * @param configType - redis data config type.
+     * @return - Returns the redis nodes.
+     */
+    private Collection<?> getJedisNodes(String hosts, RedisConfigType configType) {
+        hosts = hosts.replaceAll("\\s", "");
+        String[] hostPorts = hosts.split(",");
+
+        Set<Object> nodes = null;
+
+        for (String hostPort : hostPorts) {
+            String[] hostPortArr = hostPort.split(":");
+
+            switch (configType) {
+                case CLUSTER:
+                    nodes = (nodes == null) ? new HashSet<>() : nodes;
+                    nodes.add(new HostAndPort(hostPortArr[0], Integer.parseInt(hostPortArr[1])));
+                    break;
+                case SENTINEL:
+                    nodes = (nodes == null) ? new HashSet<>() : nodes;
+                    nodes.add(new HostAndPort(hostPortArr[0], Integer.parseInt(hostPortArr[1])).toString());
+                    break;
+                default:
+                    int port = Integer.parseInt(hostPortArr[1]);
+                    if (!hostPortArr[0].isEmpty() && port > 0) {
+                        List<String> node = new ArrayList<>();
+                        node.add(hostPortArr[0]);
+                        node.add(String.valueOf(port));
+                        return node;
+                    }
+            }
+        }
+        return nodes;
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisClusterManager.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisClusterManager.java
@ -0,0 +1,136 @@
+package tomcat.request.session.data.cache.impl.redis;
+
+import redis.clients.jedis.HostAndPort;
+import redis.clients.jedis.JedisCluster;
+import redis.clients.jedis.JedisPoolConfig;
+import redis.clients.jedis.Protocol;
+import redis.clients.jedis.exceptions.JedisConnectionException;
+import redis.clients.jedis.exceptions.JedisRedirectionException;
+
+import java.util.Set;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+class RedisClusterManager extends RedisManager {
+
+    private final JedisCluster cluster;
+
+    private static final int NUM_RETRIES = 30;
+    private static final int DEFAULT_MAX_RE_DIRECTIONS = 5;
+    private static final long FAILURE_WAIT_TIME = 4000L;
+
+    RedisClusterManager(Set<HostAndPort> nodes,
+                        String password,
+                        int timeout,
+                        JedisPoolConfig poolConfig) {
+        super(null, FAILURE_WAIT_TIME);
+        this.cluster = new JedisCluster(nodes, timeout, Protocol.DEFAULT_TIMEOUT, DEFAULT_MAX_RE_DIRECTIONS, password, poolConfig);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] set(String key, byte[] value) {
+        int tries = 0;
+        boolean retry = true;
+        String retVal = null;
+        do {
+            tries++;
+            try {
+                retVal = this.cluster.set(key.getBytes(), value);
+                retry = false;
+            } catch (JedisRedirectionException | JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return (retVal != null) ? retVal.getBytes() : null;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long setnx(String key, byte[] value) {
+        int tries = 0;
+        boolean retry = true;
+        Long retVal = null;
+        do {
+            tries++;
+            try {
+                retVal = this.cluster.setnx(key.getBytes(), value);
+                retry = false;
+            } catch (JedisRedirectionException | JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long expire(String key, int seconds) {
+        int tries = 0;
+        boolean retry = true;
+        Long retVal = null;
+        do {
+            tries++;
+            try {
+                retVal = this.cluster.expire(key, seconds);
+                retry = false;
+            } catch (JedisRedirectionException | JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] get(String key) {
+        int tries = 0;
+        boolean retry = true;
+        byte[] retVal = null;
+        do {
+            tries++;
+            try {
+                retVal = this.cluster.get(key.getBytes());
+                retry = false;
+            } catch (JedisRedirectionException | JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long delete(String key) {
+        int tries = 0;
+        boolean retry = true;
+        Long retVal = null;
+        do {
+            tries++;
+            try {
+                retVal = this.cluster.del(key);
+                retry = false;
+            } catch (JedisRedirectionException | JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Boolean exists(String key) {
+        int tries = 0;
+        boolean retry = true;
+        Boolean retVal = null;
+        do {
+            tries++;
+            try {
+                retVal = this.cluster.exists(key);
+                retry = false;
+            } catch (JedisRedirectionException | JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisManager.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisManager.java
@ -0,0 +1,151 @@
+package tomcat.request.session.data.cache.impl.redis;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import redis.clients.jedis.Jedis;
+import redis.clients.jedis.exceptions.JedisConnectionException;
+import redis.clients.jedis.util.Pool;
+import tomcat.request.session.data.cache.DataCache;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+abstract class RedisManager implements DataCache {
+
+    private static final int NUM_RETRIES = 3;
+    private static final Logger LOGGER = LoggerFactory.getLogger(RedisManager.class);
+
+    private static final String REDIS_CONN_FAILED_RETRY_MSG = "Jedis connection failed, retrying...";
+
+    private final Pool<Jedis> pool;
+    private final long failureWaitTime;
+
+    RedisManager(Pool<Jedis> pool, long failureWaitTime) {
+        this.pool = pool;
+        this.failureWaitTime = failureWaitTime;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] set(String key, byte[] value) {
+        int tries = 0;
+        boolean retry = true;
+        String retVal = null;
+        do {
+            tries++;
+            try (Jedis jedis = this.pool.getResource()) {
+                retVal = jedis.set(key.getBytes(), value);
+                retry = false;
+            } catch (JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return (retVal != null) ? retVal.getBytes() : null;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long setnx(String key, byte[] value) {
+        int tries = 0;
+        boolean retry = true;
+        Long retVal = null;
+        do {
+            tries++;
+            try (Jedis jedis = this.pool.getResource()) {
+                retVal = jedis.setnx(key.getBytes(), value);
+                retry = false;
+            } catch (JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long expire(String key, int seconds) {
+        int tries = 0;
+        boolean retry = true;
+        Long retVal = null;
+        do {
+            tries++;
+            try (Jedis jedis = this.pool.getResource()) {
+                retVal = jedis.expire(key, seconds);
+                retry = false;
+            } catch (JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public byte[] get(String key) {
+        int tries = 0;
+        boolean retry = true;
+        byte[] retVal = null;
+        do {
+            tries++;
+            try (Jedis jedis = this.pool.getResource()) {
+                retVal = jedis.get(key.getBytes());
+                retry = false;
+            } catch (JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Long delete(String key) {
+        int tries = 0;
+        boolean retry = true;
+        Long retVal = null;
+        do {
+            tries++;
+            try (Jedis jedis = this.pool.getResource()) {
+                retVal = jedis.del(key);
+                retry = false;
+            } catch (JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Boolean exists(String key) {
+        int tries = 0;
+        boolean retry = true;
+        Boolean retVal = null;
+        do {
+            tries++;
+            try (Jedis jedis = this.pool.getResource()) {
+                retVal = jedis.exists(key);
+                retry = false;
+            } catch (JedisConnectionException ex) {
+                handleException(tries, ex);
+            }
+        } while (retry && tries <= NUM_RETRIES);
+        return retVal;
+    }
+
+    /**
+     * To handle jedis exception.
+     *
+     * @param tries - exception occurred in tries.
+     * @param ex    - jedis exception.
+     */
+    void handleException(int tries, RuntimeException ex) {
+        LOGGER.error(REDIS_CONN_FAILED_RETRY_MSG + tries);
+        if (tries == NUM_RETRIES) {
+            throw ex;
+        }
+        try {
+            Thread.sleep(this.failureWaitTime);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisSentinelManager.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisSentinelManager.java
@ -0,0 +1,21 @@
+package tomcat.request.session.data.cache.impl.redis;
+
+import redis.clients.jedis.JedisPoolConfig;
+import redis.clients.jedis.JedisSentinelPool;
+
+import java.util.Set;
+
+/** author: Ranjith Manickam @ 3 Dec' 2018 */
+class RedisSentinelManager extends RedisManager {
+
+    private static final long FAILURE_WAIT_TIME = 2000L;
+
+    RedisSentinelManager(Set<String> nodes,
+                         String masterName,
+                         String password,
+                         int database,
+                         int timeout,
+                         JedisPoolConfig poolConfig) {
+        super(new JedisSentinelPool(masterName, nodes, poolConfig, timeout, password, database), FAILURE_WAIT_TIME);
+    }
+}
--- a/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisStandardManager.java
+++ b/src/main/java/tomcat/request/session/data/cache/impl/redis/RedisStandardManager.java
@ -0,0 +1,19 @@
+package tomcat.request.session.data.cache.impl.redis;
+
+import redis.clients.jedis.JedisPool;
+import redis.clients.jedis.JedisPoolConfig;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+class RedisStandardManager extends RedisManager {
+
+    private static final long FAILURE_WAIT_TIME = 2000L;
+
+    RedisStandardManager(String host,
+                         int port,
+                         String password,
+                         int database,
+                         int timeout,
+                         JedisPoolConfig poolConfig) {
+        super(new JedisPool(poolConfig, host, port, timeout, password, database), FAILURE_WAIT_TIME);
+    }
+}
--- a/src/main/java/tomcat/request/session/exception/BackendException.java
+++ b/src/main/java/tomcat/request/session/exception/BackendException.java
@ -0,0 +1,11 @@
+package tomcat.request.session.exception;
+
+/** author: Ranjith Manickam @ 3 Dec' 2018 */
+public class BackendException extends RuntimeException {
+
+    private static final String ERROR_MESSAGE = "For some reason we couldn't process your request. Please contact system administrator for more details.";
+
+    public BackendException() {
+        super(ERROR_MESSAGE, null, false, false);
+    }
+}
--- a/src/main/java/tomcat/request/session/model/Config.java
+++ b/src/main/java/tomcat/request/session/model/Config.java
@ -0,0 +1,266 @@
+package tomcat.request.session.model;
+
+import redis.clients.jedis.Protocol;
+import tomcat.request.session.annotation.Property;
+
+import java.io.Serializable;
+
+import static tomcat.request.session.annotation.Property.PropertyType.BOOLEAN;
+import static tomcat.request.session.annotation.Property.PropertyType.INTEGER;
+
+/** author: Ranjith Manickam @ 5 Feb' 2020 */
+public class Config implements Serializable {
+
+    private static final long serialVersionUID = 3480402257971437776L;
+
+    public static final String APPLICATION_PROPERTIES_FILE = "redis-data-cache.properties";
+
+    /** Redis config type. */
+    public enum RedisConfigType {
+        DEFAULT,
+        SENTINEL,
+        CLUSTER
+    }
+
+    @Property(name = "redis.hosts", defaultValue = "127.0.0.1:6379")
+    private String redisHosts;
+
+    @Property(name = "redis.cluster.enabled", type = BOOLEAN, defaultValue = "false")
+    private Boolean redisClusterEnabled;
+
+    @Property(name = "redis.sentinel.enabled", type = BOOLEAN, defaultValue = "false")
+    private Boolean redisSentinelEnabled;
+
+    @Property(name = "lb.sticky-session.enabled", type = BOOLEAN, defaultValue = "false")
+    private Boolean lbStickySessionEnabled;
+
+    @Property(name = "redis.max.active", type = INTEGER, defaultValue = "10")
+    private Integer redisMaxActive;
+
+    @Property(name = "redis.test.onBorrow", type = BOOLEAN, defaultValue = "true")
+    private Boolean redisTestOnBorrow;
+
+    @Property(name = "redis.test.onReturn", type = BOOLEAN, defaultValue = "true")
+    private Boolean redisTestOnReturn;
+
+    @Property(name = "redis.max.idle", type = INTEGER, defaultValue = "5")
+    private Integer redisMaxIdle;
+
+    @Property(name = "redis.min.idle", type = INTEGER, defaultValue = "1")
+    private Integer redisMinIdle;
+
+    @Property(name = "redis.test.whileIdle", type = BOOLEAN, defaultValue = "true")
+    private Boolean redisTestWhileIdle;
+
+    @Property(name = "redis.test.numPerEviction", type = INTEGER, defaultValue = "10")
+    private Integer redisTestNumPerEviction;
+
+    @Property(name = "redis.time.betweenEviction", type = INTEGER, defaultValue = "60000")
+    private Integer redisTimeBetweenEviction;
+
+    @Property(name = "redis.password")
+    private String redisPassword;
+
+    @Property(name = "redis.database", type = INTEGER, defaultValue = "0")
+    private Integer redisDatabase;
+
+    @Property(name = "redis.timeout", type = INTEGER, defaultValue = "2000")
+    private Integer redisTimeout;
+
+    @Property(name = "redis.sentinel.master", defaultValue = "mymaster")
+    private String redisSentinelMaster;
+
+    @Property(name = "redis.session.expiry.job.interval", type = INTEGER, defaultValue = "60")
+    private Integer redisSessionExpiryJobInterval;
+
+    @Property(name = "redis.session.data-sync.job.interval", type = INTEGER, defaultValue = "10")
+    private Integer redisSessionDataSyncJobInterval;
+
+    @Property(name = "session.persistent.policies", defaultValue = "DEFAULT")
+    private String sessionPersistentPolicies;
+
+    @Property(name = "redis.sso.timeout", type = INTEGER, defaultValue = "0")
+    private Integer redisSSOTimeout;
+
+    public Config() {
+    }
+
+    public Config(String redisHosts,
+                  Boolean redisClusterEnabled,
+                  Boolean redisSentinelEnabled,
+                  Boolean lbStickySessionEnabled,
+                  Integer redisMaxActive,
+                  Boolean redisTestOnBorrow,
+                  Boolean redisTestOnReturn,
+                  Integer redisMaxIdle,
+                  Integer redisMinIdle,
+                  Boolean redisTestWhileIdle,
+                  Integer redisTestNumPerEviction,
+                  Integer redisTimeBetweenEviction,
+                  String redisPassword,
+                  Integer redisDatabase,
+                  Integer redisTimeout,
+                  String redisSentinelMaster,
+                  Integer redisSessionExpiryJobInterval,
+                  Integer redisSessionDataSyncJobInterval,
+                  String sessionPersistentPolicies,
+                  Integer redisSSOTimeout) {
+        this.redisHosts = redisHosts;
+        this.redisClusterEnabled = redisClusterEnabled;
+        this.redisSentinelEnabled = redisSentinelEnabled;
+        this.lbStickySessionEnabled = lbStickySessionEnabled;
+        this.redisMaxActive = redisMaxActive;
+        this.redisTestOnBorrow = redisTestOnBorrow;
+        this.redisTestOnReturn = redisTestOnReturn;
+        this.redisMaxIdle = redisMaxIdle;
+        this.redisMinIdle = redisMinIdle;
+        this.redisTestWhileIdle = redisTestWhileIdle;
+        this.redisTestNumPerEviction = redisTestNumPerEviction;
+        this.redisTimeBetweenEviction = redisTimeBetweenEviction;
+        this.redisPassword = redisPassword;
+        this.redisDatabase = redisDatabase;
+        this.redisTimeout = redisTimeout;
+        this.redisSentinelMaster = redisSentinelMaster;
+        this.redisSessionExpiryJobInterval = redisSessionExpiryJobInterval;
+        this.redisSessionDataSyncJobInterval = redisSessionDataSyncJobInterval;
+        this.sessionPersistentPolicies = sessionPersistentPolicies;
+        this.redisSSOTimeout = redisSSOTimeout;
+    }
+
+    /** To get 'redis.hosts' value. */
+    public String getRedisHosts() {
+        return redisHosts;
+    }
+
+    /** To get 'redis.cluster.enabled' value. */
+    public Boolean getRedisClusterEnabled() {
+        return redisClusterEnabled;
+    }
+
+    /** To get 'redis.sentinel.enabled' value. */
+    public Boolean getRedisSentinelEnabled() {
+        return redisSentinelEnabled;
+    }
+
+    /** To get 'lb.sticky-session.enabled' value. */
+    public Boolean getLbStickySessionEnabled() {
+        return lbStickySessionEnabled;
+    }
+
+    /** To get 'redis.max.active' value. */
+    public Integer getRedisMaxActive() {
+        return redisMaxActive;
+    }
+
+    /** To get 'redis.test.onBorrow' value. */
+    public Boolean getRedisTestOnBorrow() {
+        return redisTestOnBorrow;
+    }
+
+    /** To get 'redis.test.onReturn' value. */
+    public Boolean getRedisTestOnReturn() {
+        return redisTestOnReturn;
+    }
+
+    /** To get 'redis.max.idle' value. */
+    public Integer getRedisMaxIdle() {
+        return redisMaxIdle;
+    }
+
+    /** To get 'redis.min.idle' value. */
+    public Integer getRedisMinIdle() {
+        return redisMinIdle;
+    }
+
+    /** To get 'redis.test.whileIdle' value. */
+    public Boolean getRedisTestWhileIdle() {
+        return redisTestWhileIdle;
+    }
+
+    /** To get 'redis.test.numPerEviction' value. */
+    public Integer getRedisTestNumPerEviction() {
+        return redisTestNumPerEviction;
+    }
+
+    /** To get 'redis.time.betweenEviction' value. */
+    public Integer getRedisTimeBetweenEviction() {
+        return redisTimeBetweenEviction;
+    }
+
+    /** To get 'redis.password' value. */
+    public String getRedisPassword() {
+        return (redisPassword == null || redisPassword.isEmpty()) ? null : redisPassword;
+    }
+
+    /** To get 'redis.database' value. */
+    public Integer getRedisDatabase() {
+        return redisDatabase;
+    }
+
+    /** To get 'redis.timeout' value. */
+    public Integer getRedisTimeout() {
+        return Math.max(redisTimeout, Protocol.DEFAULT_TIMEOUT);
+    }
+
+    /** To get 'redis.sentinel.master' value. */
+    public String getRedisSentinelMaster() {
+        return redisSentinelMaster;
+    }
+
+    /** To get 'redis.session.expiry.job.interval' value. */
+    public Integer getRedisSessionExpiryJobInterval() {
+        return redisSessionExpiryJobInterval;
+    }
+
+    /** To get 'redis.session.data-sync.job.interval' value. */
+    public Integer getRedisSessionDataSyncJobInterval() {
+        return redisSessionDataSyncJobInterval;
+    }
+
+    /** To get 'session.persistent.policies' value */
+    public String getSessionPersistentPolicies() {
+        return sessionPersistentPolicies;
+    }
+
+    /** To get 'redis.sso.timeout' value */
+    public Integer getRedisSSOTimeout() {
+        return redisSSOTimeout;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        return "Config{" +
+                "redisHosts='" + redisHosts + '\'' +
+                ", redisClusterEnabled=" + redisClusterEnabled +
+                ", redisSentinelEnabled=" + redisSentinelEnabled +
+                ", lbStickySessionEnabled=" + lbStickySessionEnabled +
+                ", redisMaxActive=" + redisMaxActive +
+                ", redisTestOnBorrow=" + redisTestOnBorrow +
+                ", redisTestOnReturn=" + redisTestOnReturn +
+                ", redisMaxIdle=" + redisMaxIdle +
+                ", redisMinIdle=" + redisMinIdle +
+                ", redisTestWhileIdle=" + redisTestWhileIdle +
+                ", redisTestNumPerEviction=" + redisTestNumPerEviction +
+                ", redisTimeBetweenEviction=" + redisTimeBetweenEviction +
+                ", redisPassword='" + redisPassword + '\'' +
+                ", redisDatabase=" + redisDatabase +
+                ", redisTimeout=" + redisTimeout +
+                ", redisSentinelMaster='" + redisSentinelMaster + '\'' +
+                ", redisSessionExpiryJobInterval=" + redisSessionExpiryJobInterval +
+                ", redisSessionDataSyncJobInterval=" + redisSessionDataSyncJobInterval +
+                ", sessionPersistentPolicies='" + sessionPersistentPolicies + '\'' +
+                ", redisSSOTimeout='" + redisSSOTimeout + '\'' +
+                '}';
+    }
+
+    /** To get redis config type. */
+    public RedisConfigType getRedisConfigType() {
+        if (this.getRedisClusterEnabled()) {
+            return RedisConfigType.CLUSTER;
+        } else if (this.getRedisSentinelEnabled()) {
+            return RedisConfigType.SENTINEL;
+        }
+        return RedisConfigType.DEFAULT;
+    }
+}
--- a/src/main/java/tomcat/request/session/model/Session.java
+++ b/src/main/java/tomcat/request/session/model/Session.java
@ -0,0 +1,133 @@
+package tomcat.request.session.model;
+
+import org.apache.catalina.Manager;
+import org.apache.catalina.session.StandardSession;
+import tomcat.request.session.redis.SessionManager;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.security.Principal;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+public class Session extends StandardSession {
+
+    private static final long serialVersionUID = -6056744304016869278L;
+
+    private Boolean dirty;
+    private Map<String, Object> changedAttributes;
+
+    private static Boolean manualDirtyTrackingSupportEnabled = false;
+    private static String manualDirtyTrackingAttributeKey = "__changed__";
+
+    public Session(Manager manager) {
+        super(manager);
+        resetDirtyTracking();
+    }
+
+    /** To reset dirty tracking. */
+    public void resetDirtyTracking() {
+        this.changedAttributes = new HashMap<>();
+        this.dirty = false;
+    }
+
+    /** To set manual dirty tracking support enabled. */
+    public static void setManualDirtyTrackingSupportEnabled(boolean enabled) {
+        manualDirtyTrackingSupportEnabled = enabled;
+    }
+
+    /** To set manual dirty tracking attribute key. */
+    public static void setManualDirtyTrackingAttributeKey(String key) {
+        manualDirtyTrackingAttributeKey = key;
+    }
+
+    /** Returns dirty check. */
+    public Boolean isDirty() {
+        return this.dirty || !this.changedAttributes.isEmpty();
+    }
+
+    /** To get changed attributes. */
+    public Map<String, Object> getChangedAttributes() {
+        return this.changedAttributes;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void setAttribute(String key, Object value) {
+        if (manualDirtyTrackingSupportEnabled && manualDirtyTrackingAttributeKey.equals(key)) {
+            this.dirty = true;
+            return;
+        }
+
+        Object oldValue = getAttribute(key);
+        super.setAttribute(key, value);
+
+        if ((value != null || oldValue != null)
+                && (value == null && oldValue != null || oldValue == null && value != null || !value.getClass().isInstance(oldValue) || !value.equals(oldValue))) {
+            if (this.manager instanceof SessionManager && ((SessionManager) this.manager).getSaveOnChange()) {
+                ((SessionManager) this.manager).save(this, true);
+            } else {
+                this.changedAttributes.put(key, value);
+            }
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Object getAttribute(String name) {
+        return super.getAttribute(name);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public Enumeration<String> getAttributeNames() {
+        return super.getAttributeNames();
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void removeAttribute(String name) {
+        super.removeAttribute(name);
+        if (this.manager instanceof SessionManager && ((SessionManager) this.manager).getSaveOnChange()) {
+            ((SessionManager) this.manager).save(this, true);
+        } else {
+            this.dirty = true;
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void setPrincipal(Principal principal) {
+        super.setPrincipal(principal);
+        this.dirty = true;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void writeObjectData(ObjectOutputStream out) throws IOException {
+        super.writeObjectData(out);
+        out.writeLong(this.getCreationTime());
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void readObjectData(ObjectInputStream in) throws IOException, ClassNotFoundException {
+        super.readObjectData(in);
+        this.setCreationTime(in.readLong());
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void invalidate() {
+        super.invalidate();
+    }
+}
--- a/src/main/java/tomcat/request/session/model/SessionContext.java
+++ b/src/main/java/tomcat/request/session/model/SessionContext.java
@ -0,0 +1,56 @@
+package tomcat.request.session.model;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+public class SessionContext {
+
+    private String id;
+    private Session session;
+    private boolean persisted;
+    private SessionMetadata metadata;
+
+    /** To get session id. */
+    public String getId() {
+        return id;
+    }
+
+    /** To set session id. */
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    /** To get session. */
+    public Session getSession() {
+        return session;
+    }
+
+    /** To set session. */
+    public void setSession(Session session) {
+        this.session = session;
+    }
+
+    /** To check session is persisted. */
+    public boolean isPersisted() {
+        return persisted;
+    }
+
+    /** To set session persisted. */
+    public void setPersisted(boolean persisted) {
+        this.persisted = persisted;
+    }
+
+    /** To get session meta-data. */
+    public SessionMetadata getMetadata() {
+        return metadata;
+    }
+
+    /** To set session meta-data. */
+    public void setMetadata(SessionMetadata metadata) {
+        this.metadata = metadata;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public String toString() {
+        return "SessionContext [id=" + id + "]";
+    }
+}
--- a/src/main/java/tomcat/request/session/model/SessionMetadata.java
+++ b/src/main/java/tomcat/request/session/model/SessionMetadata.java
@ -0,0 +1,47 @@
+package tomcat.request.session.model;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+public class SessionMetadata implements Serializable {
+
+    private static final long serialVersionUID = 124438185184833546L;
+
+    private byte[] attributesHash;
+
+    public SessionMetadata() {
+        this.attributesHash = new byte[0];
+    }
+
+    /** To get session meta-data hash. */
+    public byte[] getAttributesHash() {
+        return this.attributesHash;
+    }
+
+    /** To set session meta-data hash. */
+    public void setAttributesHash(byte[] attributesHash) {
+        this.attributesHash = attributesHash;
+    }
+
+    /** To copy session meta-data. */
+    public void copyFieldsFrom(SessionMetadata metadata) {
+        this.setAttributesHash(metadata.getAttributesHash());
+    }
+
+    /** To write session meta-data to output stream. */
+    private void writeObject(ObjectOutputStream out) throws IOException {
+        out.writeInt(this.attributesHash.length);
+        out.write(this.attributesHash);
+    }
+
+    /** To read session meta-data from input stream. */
+    private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
+        int hashLength = in.readInt();
+        byte[] attributesHash = new byte[hashLength];
+        in.read(attributesHash, 0, hashLength);
+        this.attributesHash = attributesHash;
+    }
+}
--- a/src/main/java/tomcat/request/session/model/SingleSignOnEntry.java
+++ b/src/main/java/tomcat/request/session/model/SingleSignOnEntry.java
@ -0,0 +1,100 @@
+package tomcat.request.session.model;
+
+import org.apache.catalina.Session;
+import org.apache.catalina.authenticator.SingleSignOnListener;
+import org.apache.catalina.authenticator.SingleSignOnSessionKey;
+
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
+import java.security.Principal;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.ConcurrentMap;
+
+/** author: Ranjith Manickam @ 20 Mar' 2020 */
+public class SingleSignOnEntry implements Serializable {
+
+    private static final long serialVersionUID = 4590485271396917062L;
+
+    private String authType;
+    private String password;
+    private Principal principal;
+    private String username;
+    private boolean canReauthenticate = false;
+    private final ConcurrentMap<SingleSignOnSessionKey, SingleSignOnSessionKey> sessionKeys;
+
+    public SingleSignOnEntry() {
+        this.sessionKeys = new ConcurrentHashMap<>();
+    }
+
+    public SingleSignOnEntry(Principal principal, String authType, String username, String password) {
+        this.sessionKeys = new ConcurrentHashMap<>();
+        this.updateCredentials(principal, authType, username, password);
+    }
+
+    public void addSession(String ssoId, Session session) {
+        SingleSignOnSessionKey key = new SingleSignOnSessionKey(session);
+        SingleSignOnSessionKey currentKey = this.sessionKeys.putIfAbsent(key, key);
+        if (currentKey == null) {
+            session.addSessionListener(new SingleSignOnListener(ssoId));
+        }
+    }
+
+    public void removeSession(Session session) {
+        SingleSignOnSessionKey key = new SingleSignOnSessionKey(session);
+        this.sessionKeys.remove(key);
+    }
+
+    public Set<SingleSignOnSessionKey> findSessions() {
+        return this.sessionKeys.keySet();
+    }
+
+    public String getAuthType() {
+        return this.authType;
+    }
+
+    public boolean getCanReauthenticate() {
+        return this.canReauthenticate;
+    }
+
+    public String getPassword() {
+        return this.password;
+    }
+
+    public Principal getPrincipal() {
+        return this.principal;
+    }
+
+    public String getUsername() {
+        return this.username;
+    }
+
+    public synchronized void updateCredentials(Principal principal, String authType, String username, String password) {
+        this.principal = principal;
+        this.authType = authType;
+        this.username = username;
+        this.password = password;
+        this.canReauthenticate = "BASIC".equals(authType) || "FORM".equals(authType);
+    }
+
+    public void writeObjectData(ObjectOutputStream out) throws IOException {
+        try (ObjectOutputStream outputStream = new ObjectOutputStream(out)) {
+            outputStream.writeObject(this);
+            outputStream.flush();
+        }
+    }
+
+    public void readObjectData(ObjectInputStream in) throws IOException, ClassNotFoundException {
+        try (ObjectInputStream inputStream = new ObjectInputStream(in)) {
+            SingleSignOnEntry entry = (SingleSignOnEntry) inputStream.readObject();
+            this.authType = entry.authType;
+            this.password = entry.password;
+            this.principal = entry.principal;
+            this.username = entry.username;
+            this.canReauthenticate = entry.canReauthenticate;
+            this.sessionKeys.putAll(entry.sessionKeys);
+        }
+    }
+}
--- a/src/main/java/tomcat/request/session/redis/SessionHandlerValve.java
+++ b/src/main/java/tomcat/request/session/redis/SessionHandlerValve.java
@ -1,42 +1,39 @@
 package tomcat.request.session.redis;

-import java.io.IOException;
-
-import javax.servlet.ServletException;
-
 import org.apache.catalina.connector.Request;
 import org.apache.catalina.connector.Response;
 import org.apache.catalina.valves.ValveBase;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import tomcat.request.session.exception.BackendException;

-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Valve that implements per-request session persistence. It is intended to be
- * used with non-sticky load-balancers.
- *
- * @author Ranjith Manickam
- * @since 2.0
- */
+import javax.servlet.ServletException;
+import java.io.IOException;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
 public class SessionHandlerValve extends ValveBase {

-	private SessionManager manager;
+    private static final Logger LOGGER = LoggerFactory.getLogger(SessionHandlerValve.class);

-	/**
-	 * To set session manager
-	 * 
-	 * @param manager
-	 */
-	public void setSessionManager(SessionManager manager) {
-		this.manager = manager;
-	}
+    private SessionManager manager;

-	/** {@inheritDoc} */
-	@Override
-	public void invoke(Request request, Response response) throws IOException, ServletException {
-		try {
-			getNext().invoke(request, response);
-		} finally {
-			manager.afterRequest(request);
-		}
-	}
+    /** To set session manager */
+    void setSessionManager(SessionManager manager) {
+        this.manager = manager;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void invoke(Request request, Response response) throws BackendException {
+        try {
+            getNext().invoke(request, response);
+        } catch (IOException | ServletException | RuntimeException ex) {
+            LOGGER.error("Error processing request", ex);
+            throw new BackendException();
+        } finally {
+            if (this.manager != null) {
+                this.manager.afterRequest();
+            }
+        }
+    }
 }
--- a/src/main/java/tomcat/request/session/redis/SessionManager.java
+++ b/src/main/java/tomcat/request/session/redis/SessionManager.java
@ -1,407 +1,384 @@
 package tomcat.request.session.redis;

-import java.io.IOException;
-import java.lang.reflect.Method;
-import java.util.Arrays;
-import java.util.EnumSet;
-import java.util.Set;
-
 import org.apache.catalina.Context;
 import org.apache.catalina.Lifecycle;
 import org.apache.catalina.LifecycleException;
 import org.apache.catalina.LifecycleListener;
 import org.apache.catalina.LifecycleState;
 import org.apache.catalina.Valve;
-import org.apache.catalina.connector.Request;
 import org.apache.catalina.session.ManagerBase;
-import org.apache.commons.logging.Log;
-import org.apache.commons.logging.LogFactory;
-
-import tomcat.request.session.SerializationUtil;
-import tomcat.request.session.Session;
-import tomcat.request.session.SessionConstants;
-import tomcat.request.session.SessionContext;
-import tomcat.request.session.SessionMetadata;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import tomcat.request.session.constant.SessionConstants;
+import tomcat.request.session.constant.SessionConstants.SessionPolicy;
 import tomcat.request.session.data.cache.DataCache;
-import tomcat.request.session.data.cache.impl.RedisDataCache;
+import tomcat.request.session.data.cache.DataCacheFactory;
+import tomcat.request.session.model.Config;
+import tomcat.request.session.model.Session;
+import tomcat.request.session.model.SessionContext;
+import tomcat.request.session.model.SessionMetadata;
+import tomcat.request.session.model.SingleSignOnEntry;
+import tomcat.request.session.util.ConfigUtil;
+import tomcat.request.session.util.SerializationUtil;

-/**
- * Tomcat clustering with Redis data-cache implementation.
- * 
- * Manager that implements per-request session persistence. It is intended to be
- * used with non-sticky load-balancers.
- *
- * @author Ranjith Manickam
- * @since 2.0
- */
+import java.io.IOException;
+import java.lang.reflect.Method;
+import java.util.Arrays;
+import java.util.EnumSet;
+import java.util.Set;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
 public class SessionManager extends ManagerBase implements Lifecycle {

-	private DataCache dataCache;
+    private static final Logger LOGGER = LoggerFactory.getLogger(SessionManager.class);

-	protected SerializationUtil serializer;
+    private Integer ssoTimeout;
+    private DataCache dataCache;
+    private SerializationUtil serializer;
+    private final ThreadLocal<SessionContext> sessionContext = new ThreadLocal<>();
+    private final Set<SessionPolicy> sessionPolicy = EnumSet.of(SessionPolicy.DEFAULT);

-	protected ThreadLocal<SessionContext> sessionContext = new ThreadLocal<>();
+    public boolean getSaveOnChange() {
+        return this.sessionPolicy.contains(SessionPolicy.SAVE_ON_CHANGE);
+    }

-	protected SessionHandlerValve handlerValve;
+    private boolean getAlwaysSaveAfterRequest() {
+        return this.sessionPolicy.contains(SessionPolicy.ALWAYS_SAVE_AFTER_REQUEST);
+    }

-	protected Set<SessionPolicy> sessionPolicy = EnumSet.of(SessionPolicy.DEFAULT);
+    /** {@inheritDoc} */
+    @Override
+    public void addLifecycleListener(LifecycleListener listener) {
+        super.addLifecycleListener(listener);
+    }

-	private Log log = LogFactory.getLog(SessionManager.class);
+    /** {@inheritDoc} */
+    @Override
+    public LifecycleListener[] findLifecycleListeners() {
+        return super.findLifecycleListeners();
+    }

-	enum SessionPolicy {
-		DEFAULT, SAVE_ON_CHANGE, ALWAYS_SAVE_AFTER_REQUEST;
+    /** {@inheritDoc} */
+    @Override
+    public void removeLifecycleListener(LifecycleListener listener) {
+        super.removeLifecycleListener(listener);
+    }

-		static SessionPolicy fromName(String name) {
-			for (SessionPolicy policy : SessionPolicy.values()) {
-				if (policy.name().equalsIgnoreCase(name)) {
-					return policy;
-				}
-			}
-			throw new IllegalArgumentException("Invalid session policy [" + name + "]");
-		}
-	}
+    /** {@inheritDoc} */
+    @Override
+    protected synchronized void startInternal() throws LifecycleException {
+        super.startInternal();
+        super.setState(LifecycleState.STARTING);

-	/**
-	 * To get session persist policies
-	 * 
-	 * @return
-	 */
-	public String getSessionPersistPolicies() {
-		String policyStr = null;
-		for (SessionPolicy policy : this.sessionPolicy) {
-			policyStr = (policyStr == null) ? policy.name() : policyStr.concat(",").concat(policy.name());
-		}
-		return policyStr;
-	}
+        boolean initializedValve = false;
+        Context context = getContextIns();
+        for (Valve valve : context.getPipeline().getValves()) {
+            if (valve instanceof SessionHandlerValve) {
+                SessionHandlerValve handlerValve = (SessionHandlerValve) valve;
+                handlerValve.setSessionManager(this);
+                initializedValve = true;
+                break;
+            }
+        }

-	/**
-	 * To set session persist policies
-	 * 
-	 * @param policyStr
-	 */
-	public void setSessionPersistPolicies(String policyStr) {
-		Set<SessionPolicy> policySet = EnumSet.of(SessionPolicy.DEFAULT);
-		String[] policyArray = policyStr.split(",");
+        if (!initializedValve) {
+            throw new LifecycleException("Session handling valve is not initialized..");
+        }
+        initialize();
+        LOGGER.info("The sessions will expire after " + (getSessionTimeout(null)) + " seconds.");
+        context.setDistributable(true);
+    }

-		for (String policy : policyArray) {
-			policySet.add(SessionPolicy.fromName(policy));
-		}
-		this.sessionPolicy = policySet;
-	}
+    /** {@inheritDoc} */
+    @Override
+    protected synchronized void stopInternal() throws LifecycleException {
+        super.setState(LifecycleState.STOPPING);
+        super.stopInternal();
+    }

-	/**
-	 * @return
-	 */
-	public boolean getSaveOnChange() {
-		return this.sessionPolicy.contains(SessionPolicy.SAVE_ON_CHANGE);
-	}
+    /** {@inheritDoc} */
+    @Override
+    public Session createSession(String sessionId) {
+        if (sessionId != null) {
+            sessionId = (this.dataCache.setnx(sessionId, SessionConstants.NULL_SESSION) == 0L) ? null : sessionId;
+        } else {
+            do {
+                sessionId = generateSessionId();
+            } while (this.dataCache.setnx(sessionId, SessionConstants.NULL_SESSION) == 0L);
+        }

-	/**
-	 * @return
-	 */
-	public boolean getAlwaysSaveAfterRequest() {
-		return this.sessionPolicy.contains(SessionPolicy.ALWAYS_SAVE_AFTER_REQUEST);
-	}
+        Session session = (sessionId != null) ? createEmptySession() : null;
+        if (session != null) {
+            session.setId(sessionId);
+            session.setNew(true);
+            session.setValid(true);
+            session.setCreationTime(System.currentTimeMillis());
+            session.setMaxInactiveInterval(getSessionTimeout(session));
+            session.tellNew();
+        }
+        setValues(sessionId, session, false, new SessionMetadata());

-	/** {@inheritDoc} */
-	@Override
-	public void addLifecycleListener(LifecycleListener listener) {
-		super.addLifecycleListener(listener);
-	}
+        if (session != null) {
+            try {
+                save(session, true);
+            } catch (Exception ex) {
+                LOGGER.error("Error occurred while creating session..", ex);
+                setValues(null, null);
+                session = null;
+            }
+        }
+        return session;
+    }

-	/** {@inheritDoc} */
-	@Override
-	public LifecycleListener[] findLifecycleListeners() {
-		return super.findLifecycleListeners();
-	}
+    /** {@inheritDoc} */
+    @Override
+    public Session createEmptySession() {
+        return new Session(this);
+    }

-	/** {@inheritDoc} */
-	@Override
-	public void removeLifecycleListener(LifecycleListener listener) {
-		super.removeLifecycleListener(listener);
-	}
+    /** {@inheritDoc} */
+    @Override
+    public void add(org.apache.catalina.Session session) {
+        save(session, false);
+    }

-	/** {@inheritDoc} */
-	@Override
-	protected synchronized void startInternal() throws LifecycleException {
-		super.startInternal();
-		super.setState(LifecycleState.STARTING);
+    /** {@inheritDoc} */
+    @Override
+    public Session findSession(String sessionId) throws IOException {
+        if (sessionId != null && this.sessionContext.get() != null && sessionId.equals(this.sessionContext.get().getId())) {
+            return this.sessionContext.get().getSession();
+        }

-		boolean initializedValve = false;
-		Context context = getContextIns();
-		for (Valve valve : context.getPipeline().getValves()) {
-			if (valve instanceof SessionHandlerValve) {
-				this.handlerValve = (SessionHandlerValve) valve;
-				this.handlerValve.setSessionManager(this);
-				initializedValve = true;
-				break;
-			}
-		}
+        Session session = null;
+        boolean isPersisted = false;
+        SessionMetadata metadata = null;

-		if (!initializedValve)
-			throw new LifecycleException("Session handling valve is not initialized..");
+        byte[] data = this.dataCache.get(sessionId);
+        if (data == null) {
+            sessionId = null;
+            isPersisted = false;
+        } else {
+            if (Arrays.equals(SessionConstants.NULL_SESSION, data)) {
+                throw new IOException("NULL session data");
+            }
+            try {
+                metadata = new SessionMetadata();
+                Session newSession = createEmptySession();
+                this.serializer.deserializeSessionData(data, newSession, metadata);

-		initialize();
+                newSession.setId(sessionId);
+                newSession.access();
+                newSession.setNew(false);
+                newSession.setValid(true);
+                newSession.resetDirtyTracking();
+                newSession.setMaxInactiveInterval(getSessionTimeout(newSession));

-		log.info("The sessions will expire after " + (getSessionTimeout(null)) + " seconds.");
-		context.setDistributable(true);
-	}
+                session = newSession;
+                isPersisted = true;
+            } catch (Exception ex) {
+                LOGGER.error("Error occurred while de-serializing the session object..", ex);
+            }
+        }
+        setValues(sessionId, session, isPersisted, metadata);
+        return session;
+    }

-	/** {@inheritDoc} */
-	@Override
-	protected synchronized void stopInternal() throws LifecycleException {
-		super.setState(LifecycleState.STOPPING);
-		super.stopInternal();
-	}
+    /** {@inheritDoc} */
+    @Override
+    public void remove(org.apache.catalina.Session session) {
+        remove(session, false);
+    }

-	/** {@inheritDoc} */
-	@Override
-	public Session createSession(String sessionId) {
-		if (sessionId != null) {
-			sessionId = (this.dataCache.setnx(sessionId, SessionConstants.NULL_SESSION) == 0L) ? null : sessionId;
-		} else {
-			do {
-				sessionId = generateSessionId();
-			} while (this.dataCache.setnx(sessionId, SessionConstants.NULL_SESSION) == 0L);
-		}
+    /** {@inheritDoc} */
+    @Override
+    public void remove(org.apache.catalina.Session session, boolean update) {
+        this.dataCache.delete(session.getId());
+    }

-		Session session = (sessionId != null) ? (Session) createEmptySession() : null;
-		if (session != null) {
-			session.setId(sessionId);
-			session.setNew(true);
-			session.setValid(true);
-			session.setCreationTime(System.currentTimeMillis());
-			session.setMaxInactiveInterval(getSessionTimeout(session));
-			session.tellNew();
-		}
-		setValues(sessionId, session, false, new SessionMetadata());
+    /** {@inheritDoc} */
+    @Override
+    public void load() {
+        // Auto-generated method stub
+    }

-		if (session != null) {
-			try {
-				save(session, true);
-			} catch (Exception ex) {
-				log.error("Error occured while creating session..", ex);
-				setValues(null, null);
-				session = null;
-			}
-		}
-		return session;
-	}
+    /** {@inheritDoc} */
+    @Override
+    public void unload() {
+        // Auto-generated method stub
+    }

-	/** {@inheritDoc} */
-	@Override
-	public Session createEmptySession() {
-		return new Session(this);
-	}
+    /** To initialize the session manager. */
+    private void initialize() {
+        try {
+            Config config = ConfigUtil.getConfig();
+            this.ssoTimeout = config.getRedisSSOTimeout();
+            this.dataCache = new DataCacheFactory(config, getSessionTimeout(null)).getDataCache();
+            this.serializer = new SerializationUtil();

-	/** {@inheritDoc} */
-	@Override
-	public void add(org.apache.catalina.Session session) {
-		save(session, false);
-	}
+            Context context = getContextIns();
+            ClassLoader loader = (context != null && context.getLoader() != null) ? context.getLoader().getClassLoader() : null;
+            this.serializer.setClassLoader(loader);

-	/** {@inheritDoc} */
-	@Override
-	public Session findSession(String sessionId) throws IOException {
-		Session session = null;
-		if (sessionId != null && this.sessionContext.get() != null && sessionId.equals(this.sessionContext.get().getId())) {
-			session = this.sessionContext.get().getSession();
-		} else {
-			byte[] data = this.dataCache.get(sessionId);
+            setSessionPersistentPolicies(config);
+        } catch (Exception ex) {
+            LOGGER.error("Error occurred while initializing the session manager..", ex);
+            throw ex;
+        }
+    }

-			boolean isPersisted = false;
-			SessionMetadata metadata = null;
-			if (data == null) {
-				session = null;
-				metadata = null;
-				sessionId = null;
-				isPersisted = false;
-			} else {
-				if (Arrays.equals(SessionConstants.NULL_SESSION, data)) {
-					throw new IOException("NULL session data");
-				}
-				try {
-					metadata = new SessionMetadata();
-					Session newSession = (Session) createEmptySession();
-					this.serializer.deserializeSessionData(data, newSession, metadata);
+    /** To save session object to data cache. */
+    public void save(org.apache.catalina.Session session, boolean forceSave) {
+        try {
+            Boolean isPersisted;
+            Session newSession = (Session) session;
+            byte[] hash = (this.sessionContext.get() != null && this.sessionContext.get().getMetadata() != null)
+                    ? this.sessionContext.get().getMetadata().getAttributesHash() : null;
+            byte[] currentHash = this.serializer.getSessionAttributesHashCode(newSession);

-					newSession.setId(sessionId);
-					newSession.access();
-					newSession.setNew(false);
-					newSession.setValid(true);
-					newSession.resetDirtyTracking();
-					newSession.setMaxInactiveInterval(getSessionTimeout(newSession));
+            if (forceSave
+                    || newSession.isDirty()
+                    || (isPersisted = (this.sessionContext.get() != null) ? this.sessionContext.get().isPersisted() : null) == null
+                    || !isPersisted || !Arrays.equals(hash, currentHash)) {

-					session = newSession;
-					isPersisted = true;
-				} catch (Exception ex) {
-					log.error("Error occured while de-serializing the session object..", ex);
-				}
-			}
-			setValues(sessionId, session, isPersisted, metadata);
-		}
-		return session;
-	}
+                SessionMetadata metadata = new SessionMetadata();
+                metadata.setAttributesHash(currentHash);

-	/** {@inheritDoc} */
-	@Override
-	public void remove(org.apache.catalina.Session session) {
-		remove(session, false);
-	}
+                this.dataCache.set(newSession.getId(), this.serializer.serializeSessionData(newSession, metadata));
+                newSession.resetDirtyTracking();
+                setValues(true, metadata);
+            }

-	/** {@inheritDoc} */
-	@Override
-	public void remove(org.apache.catalina.Session session, boolean update) {
-		this.dataCache.expire(session.getId(), 10);
-	}
+            int timeout = getSessionTimeout(newSession);
+            this.dataCache.expire(newSession.getId(), timeout);
+            LOGGER.debug("Session [" + newSession.getId() + "] expire in [" + timeout + "] seconds.");

-	/** {@inheritDoc} */
-	@Override
-	public void load() throws ClassNotFoundException, IOException {
-		// Auto-generated method stub
-	}
+        } catch (IOException ex) {
+            LOGGER.error("Error occurred while saving the session object in data cache..", ex);
+        }
+    }

-	/** {@inheritDoc} */
-	@Override
-	public void unload() throws IOException {
-		// Auto-generated method stub
-	}
+    /** To process post request process. */
+    void afterRequest() {
+        Session session = null;
+        try {
+            session = (this.sessionContext.get() != null) ? this.sessionContext.get().getSession() : null;
+            if (session != null) {
+                if (session.isValid()) {
+                    save(session, getAlwaysSaveAfterRequest());
+                } else {
+                    remove(session);
+                }
+                LOGGER.debug("Session object " + (session.isValid() ? "saved: " : "removed: ") + session.getId());
+            }
+        } catch (Exception ex) {
+            LOGGER.error("Error occurred while processing post request process..", ex);
+        } finally {
+            this.sessionContext.remove();
+            LOGGER.debug("Session removed from ThreadLocal:" + ((session != null) ? session.getIdInternal() : ""));
+        }
+    }

-	/**
-	 * To initialize the session manager
-	 */
-	private void initialize() {
-		try {
-			this.dataCache = new RedisDataCache();
+    /** To get session timeout. */
+    private int getSessionTimeout(Session session) {
+        int timeout = getContextIns().getSessionTimeout() * 60;
+        int sessionTimeout = (session == null) ? 0 : session.getMaxInactiveInterval();
+        return (sessionTimeout < timeout) ? (Math.max(timeout, 1800)) : sessionTimeout;
+    }

-			this.serializer = new SerializationUtil();
-			Context context = getContextIns();
-			ClassLoader loader = (context != null && context.getLoader() != null) ? context.getLoader().getClassLoader() : null;
-			this.serializer.setClassLoader(loader);
-		} catch (Exception ex) {
-			log.error("Error occured while initializing the session manager..", ex);
-			throw ex;
-		}
-	}
+    /** To set values to session context. */
+    private void setValues(String sessionId, Session session) {
+        if (this.sessionContext.get() == null) {
+            this.sessionContext.set(new SessionContext());
+        }
+        this.sessionContext.get().setId(sessionId);
+        this.sessionContext.get().setSession(session);
+    }

-	/**
-	 * To save session object to data-cache
-	 * 
-	 * @param session
-	 * @param forceSave
-	 */
-	public void save(org.apache.catalina.Session session, boolean forceSave) {
-		try {
-			Boolean isPersisted;
-			Session newSession = (Session) session;
-			byte[] hash = (this.sessionContext.get() != null && this.sessionContext.get().getMetadata() != null)
-					? this.sessionContext.get().getMetadata().getAttributesHash() : null;
-			byte[] currentHash = serializer.getSessionAttributesHashCode(newSession);
+    /** To set values to session context. */
+    private void setValues(boolean isPersisted, SessionMetadata metadata) {
+        if (this.sessionContext.get() == null) {
+            this.sessionContext.set(new SessionContext());
+        }
+        this.sessionContext.get().setMetadata(metadata);
+        this.sessionContext.get().setPersisted(isPersisted);
+    }

-			if (forceSave || newSession.isDirty()
-					|| (isPersisted = (this.sessionContext.get() != null) ? this.sessionContext.get().isPersisted() : null) == null
-					|| !isPersisted || !Arrays.equals(hash, currentHash)) {
+    /** To set values to session context. */
+    private void setValues(String sessionId, Session session, boolean isPersisted, SessionMetadata metadata) {
+        setValues(sessionId, session);
+        setValues(isPersisted, metadata);
+    }

-				SessionMetadata metadata = new SessionMetadata();
-				metadata.setAttributesHash(currentHash);
+    /** To get catalina context instance. */
+    private Context getContextIns() {
+        try {
+            Method method = this.getClass().getSuperclass().getDeclaredMethod("getContext");
+            return (Context) method.invoke(this);
+        } catch (Exception ex) {
+            try {
+                Method method = this.getClass().getSuperclass().getDeclaredMethod("getContainer");
+                return (Context) method.invoke(this);
+            } catch (Exception ex2) {
+                // skip
+            }
+        }
+        throw new RuntimeException("Error occurred while creating container instance");
+    }

-				this.dataCache.set(newSession.getId(), serializer.serializeSessionData(newSession, metadata));
-				newSession.resetDirtyTracking();
-				setValues(true, metadata);
-			}
+    /** To set session persistent policies */
+    private void setSessionPersistentPolicies(Config config) {
+        String sessionPolicies = config.getSessionPersistentPolicies();
+        if (sessionPolicies == null || sessionPolicies.isEmpty()) {
+            return;
+        }

-			int timeout = getSessionTimeout(newSession);
-			this.dataCache.expire(newSession.getId(), timeout);
-			log.trace("Session [" + newSession.getId() + "] expire in [" + timeout + "] seconds.");
+        sessionPolicies = sessionPolicies.replaceAll("\\s", "");
+        String[] sessionPolicyNames = sessionPolicies.split(",");
+        for (String sessionPolicyName : sessionPolicyNames) {
+            this.sessionPolicy.add(SessionPolicy.fromName(sessionPolicyName));
+        }
+    }

-		} catch (IOException ex) {
-			log.error("Error occured while saving the session object in data cache..", ex);
-		}
-	}
+    /** To set single-sign-on entry to cache. */
+    void setSingleSignOnEntry(String ssoId, SingleSignOnEntry entry) {
+        if (entry == null) {
+            return;
+        }
+        try {
+            byte[] data = this.serializer.serializeSingleSignOnEntry(entry);
+            this.dataCache.set(ssoId, data);
+            if (this.ssoTimeout > 0) {
+                this.dataCache.expire(ssoId, this.ssoTimeout);
+            }
+        } catch (IOException ex) {
+            LOGGER.error("Error occurred while serializing the single-sign-on entry..", ex);
+        }
+    }

-	/**
-	 * To process post request process
-	 * 
-	 * @param request
-	 */
-	public void afterRequest(Request request) {
-		Session session = null;
-		try {
-			session = (this.sessionContext.get() != null) ? this.sessionContext.get().getSession() : null;
-			if (session != null) {
-				if (session.isValid())
-					save(session, getAlwaysSaveAfterRequest());
-				else
-					remove(session);
-				log.trace("Session object " + (session.isValid() ? "saved: " : "removed: ") + session.getId());
-			}
-		} catch (Exception ex) {
-			log.error("Error occured while processing post request process..", ex);
-		} finally {
-			this.sessionContext.remove();
-			log.trace("Session removed from ThreadLocal:" + ((session != null) ? session.getIdInternal() : ""));
-		}
-	}
+    /** To get single-sign-on entry from cache. */
+    SingleSignOnEntry getSingleSignOnEntry(String ssoId) {
+        byte[] data = this.dataCache.get(ssoId);
+        if (data == null) {
+            return null;
+        }

-	/**
-	 * @return
-	 */
-	private int getSessionTimeout(Session session) {
-		int timeout = getContextIns().getSessionTimeout();
-		int sessionTimeout = (session == null) ? 0 : session.getMaxInactiveInterval();
-		return (sessionTimeout < timeout) ? ((timeout < 1800) ? 1800 : timeout) : sessionTimeout;
-	}
+        SingleSignOnEntry entry = new SingleSignOnEntry();
+        try {
+            this.serializer.deserializeSingleSignOnEntry(data, entry);
+        } catch (IOException | ClassNotFoundException ex) {
+            LOGGER.error("Error occurred while de-serializing the single-sign-on entry..", ex);
+            return null;
+        }
+        return entry;
+    }

-	/**
-	 * @param sessionId
-	 * @param session
-	 */
-	private void setValues(String sessionId, Session session) {
-		if (this.sessionContext.get() == null) {
-			this.sessionContext.set(new SessionContext());
-		}
-		this.sessionContext.get().setId(sessionId);
-		this.sessionContext.get().setSession(session);
-	}
+    /** To check single-sign-on entry exists from cache. */
+    Boolean singleSignOnEntryExists(String ssoId) {
+        return this.dataCache.exists(ssoId);
+    }

-	/**
-	 * @param isPersisted
-	 * @param metadata
-	 */
-	private void setValues(boolean isPersisted, SessionMetadata metadata) {
-		if (this.sessionContext.get() == null) {
-			this.sessionContext.set(new SessionContext());
-		}
-		this.sessionContext.get().setMetadata(metadata);
-		this.sessionContext.get().setPersisted(isPersisted);
-	}
-
-	/**
-	 * @param sessionId
-	 * @param session
-	 * @param isPersisted
-	 * @param metadata
-	 */
-	private void setValues(String sessionId, Session session, boolean isPersisted, SessionMetadata metadata) {
-		setValues(sessionId, session);
-		setValues(isPersisted, metadata);
-	}
-
-	/**
-	 * @return
-	 */
-	private Context getContextIns() {
-		try {
-			Method method = this.getClass().getSuperclass().getDeclaredMethod("getContext");
-			return (Context) method.invoke(this);
-		} catch (Exception ex) {
-			try {
-				Method method = this.getClass().getSuperclass().getDeclaredMethod("getContainer");
-				return (Context) method.invoke(this);
-			} catch (Exception ex2) {
-				log.error("Error in getContext", ex2);
-			}
-		}
-		return null;
-	}
+    /** To delete single-sign-on entry from cache. */
+    void deleteSingleSignOnEntry(String ssoId) {
+        this.dataCache.delete(ssoId);
+    }
 }
--- a/src/main/java/tomcat/request/session/redis/SingleSignOnValve.java
+++ b/src/main/java/tomcat/request/session/redis/SingleSignOnValve.java
@ -0,0 +1,263 @@
+package tomcat.request.session.redis;
+
+import org.apache.catalina.Container;
+import org.apache.catalina.Context;
+import org.apache.catalina.Engine;
+import org.apache.catalina.LifecycleException;
+import org.apache.catalina.Manager;
+import org.apache.catalina.Realm;
+import org.apache.catalina.Session;
+import org.apache.catalina.authenticator.Constants;
+import org.apache.catalina.authenticator.SingleSignOn;
+import org.apache.catalina.authenticator.SingleSignOnSessionKey;
+import org.apache.catalina.connector.Request;
+import org.apache.catalina.connector.Response;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import tomcat.request.session.exception.BackendException;
+import tomcat.request.session.model.SingleSignOnEntry;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.Cookie;
+import java.io.IOException;
+import java.security.Principal;
+import java.util.Set;
+
+/** author: Ranjith Manickam @ 20 Mar' 2020 */
+public class SingleSignOnValve extends SingleSignOn {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(SingleSignOnValve.class);
+
+    private Engine engine;
+    private SessionManager manager;
+
+    /** {@inheritDoc} */
+    @Override
+    protected synchronized void startInternal() throws LifecycleException {
+        Container c;
+        for (c = this.getContainer(); c != null && !(c instanceof Engine); c = c.getParent()) {
+        }
+
+        if (c instanceof Engine) {
+            this.engine = (Engine) c;
+        }
+
+        super.startInternal();
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void invoke(Request request, Response response) throws BackendException {
+        try {
+            this.setSessionManager(request.getContext().getManager());
+
+            request.removeNote("org.apache.catalina.request.SSOID");
+            LOGGER.debug("singleSignOn.debug.invoke, requestURI: {}", request.getRequestURI());
+
+            if (request.getUserPrincipal() == null) {
+                LOGGER.debug("singleSignOn.debug.cookieCheck");
+                Cookie cookie = null;
+                Cookie[] cookies = request.getCookies();
+                if (cookies != null) {
+                    for (Cookie value : cookies) {
+                        if (Constants.SINGLE_SIGN_ON_COOKIE.equals(value.getName())) {
+                            cookie = value;
+                            break;
+                        }
+                    }
+                }
+
+                if (cookie == null) {
+                    LOGGER.debug("singleSignOn.debug.cookieNotFound");
+                } else {
+                    LOGGER.debug("singleSignOn.debug.principalCheck, ssoId: {}", cookie.getValue());
+
+                    SingleSignOnEntry entry = this.manager.getSingleSignOnEntry(cookie.getValue());
+                    if (entry == null) {
+                        LOGGER.debug("singleSignOn.debug.principalNotFound, ssoId: {}", cookie.getValue());
+                        cookie.setValue("REMOVE");
+                        cookie.setMaxAge(0);
+                        cookie.setPath("/");
+                        String domain = this.getCookieDomain();
+                        if (domain != null) {
+                            cookie.setDomain(domain);
+                        }
+
+                        cookie.setSecure(request.isSecure());
+                        if (request.getServletContext().getSessionCookieConfig().isHttpOnly() || request.getContext().getUseHttpOnly()) {
+                            cookie.setHttpOnly(true);
+                        }
+                        response.addCookie(cookie);
+                    } else {
+                        LOGGER.debug("singleSignOn.debug.principalFound, principal: {}, authType: {}", (entry.getPrincipal() != null ? entry.getPrincipal().getName() : ""), entry.getAuthType());
+                        request.setNote("org.apache.catalina.request.SSOID", cookie.getValue());
+                        if (!this.getRequireReauthentication()) {
+                            request.setAuthType(entry.getAuthType());
+                            request.setUserPrincipal(entry.getPrincipal());
+                        }
+                    }
+                }
+            } else {
+                LOGGER.debug("singleSignOn.debug.hasPrincipal, principal: {}", request.getUserPrincipal().getName());
+            }
+            this.getNext().invoke(request, response);
+
+        } catch (IOException | ServletException | RuntimeException ex) {
+            LOGGER.error("Error processing request", ex);
+            throw new BackendException();
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    public void sessionDestroyed(String ssoId, Session session) {
+        if (this.getState().isAvailable()) {
+            if ((session.getMaxInactiveInterval() <= 0 ||
+                    session.getIdleTimeInternal() < (long) (session.getMaxInactiveInterval() * 1000))
+                    && session.getManager().getContext().getState().isAvailable()) {
+
+                LOGGER.debug("singleSignOn.debug.sessionLogout, session: {}", session);
+                this.removeSession(ssoId, session);
+                if (this.manager.singleSignOnEntryExists(ssoId)) {
+                    this.deregister(ssoId);
+                }
+                return;
+            }
+
+            LOGGER.debug("singleSignOn.debug.sessionTimeout, ssoId: {}, session: {}", ssoId, session);
+            this.removeSession(ssoId, session);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected boolean associate(String ssoId, Session session) {
+        SingleSignOnEntry entry = this.manager.getSingleSignOnEntry(ssoId);
+        if (entry == null) {
+            LOGGER.debug("singleSignOn.debug.associateFail, ssoId: {}, session: {}", ssoId, session);
+            return false;
+        }
+
+        LOGGER.debug("singleSignOn.debug.associate, ssoId: {}, session: {}", ssoId, session);
+        entry.addSession(ssoId, session);
+        this.manager.setSingleSignOnEntry(ssoId, entry);
+        return true;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected void deregister(String ssoId) {
+        SingleSignOnEntry entry = this.manager.getSingleSignOnEntry(ssoId);
+        this.manager.deleteSingleSignOnEntry(ssoId);
+        if (entry == null) {
+            LOGGER.debug("singleSignOn.debug.deregisterFail, ssoId: {}", ssoId);
+            return;
+        }
+
+        Set<SingleSignOnSessionKey> ssoKeys = entry.findSessions();
+        if (ssoKeys.isEmpty()) {
+            LOGGER.debug("singleSignOn.debug.deregisterNone, ssoId: {}", ssoId);
+        }
+
+        for (SingleSignOnSessionKey ssoKey : ssoKeys) {
+            this.expire(ssoKey);
+            LOGGER.debug("singleSignOn.debug.deregister, ssoKey: {}, ssoId: {}", ssoKey, ssoId);
+        }
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected boolean reauthenticate(String ssoId, Realm realm, Request request) {
+        if (ssoId == null || realm == null) {
+            return false;
+        }
+
+        boolean reAuthenticated = false;
+        SingleSignOnEntry entry = this.manager.getSingleSignOnEntry(ssoId);
+        if (entry != null && entry.getCanReauthenticate()) {
+            String username = entry.getUsername();
+            if (username != null) {
+                Principal reAuthPrincipal = realm.authenticate(username, entry.getPassword());
+                if (reAuthPrincipal != null) {
+                    reAuthenticated = true;
+                    request.setAuthType(entry.getAuthType());
+                    request.setUserPrincipal(reAuthPrincipal);
+                }
+            }
+        }
+        return reAuthenticated;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected void register(String ssoId, Principal principal, String authType, String username, String password) {
+        LOGGER.debug("singleSignOn.debug.register, ssoId: {}, principal: {}, authType: {}", ssoId, (principal != null ? principal.getName() : ""), authType);
+        SingleSignOnEntry entry = new SingleSignOnEntry(principal, authType, username, password);
+        this.manager.setSingleSignOnEntry(ssoId, entry);
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected boolean update(String ssoId, Principal principal, String authType, String username, String password) {
+        SingleSignOnEntry entry = this.manager.getSingleSignOnEntry(ssoId);
+        if (entry == null || !entry.getCanReauthenticate()) {
+            return false;
+        }
+
+        LOGGER.debug("singleSignOn.debug.update, ssoId: {}, authType: {}", ssoId, authType);
+        entry.updateCredentials(principal, authType, username, password);
+        this.manager.setSingleSignOnEntry(ssoId, entry);
+        return true;
+    }
+
+    /** {@inheritDoc} */
+    @Override
+    protected void removeSession(String ssoId, Session session) {
+        LOGGER.debug("singleSignOn.debug.removeSession, ssoId: {}, session: {}", ssoId, session);
+        SingleSignOnEntry entry = this.manager.getSingleSignOnEntry(ssoId);
+        if (entry != null) {
+            entry.removeSession(session);
+            if (entry.findSessions().size() == 0) {
+                this.deregister(ssoId);
+            }
+        }
+    }
+
+    /** To set session manager. */
+    void setSessionManager(Manager manager) {
+        if (manager != null) {
+            this.manager = (SessionManager) manager;
+        }
+    }
+
+    /** To expire session. */
+    private void expire(SingleSignOnSessionKey key) {
+        if (this.engine == null) {
+            LOGGER.warn("singleSignOn.sessionExpire.engineNull, key: {}", key);
+        } else {
+            Container host = this.engine.findChild(key.getHostName());
+            if (host == null) {
+                LOGGER.warn("singleSignOn.sessionExpire.hostNotFound, key: {}", key);
+            } else {
+                Context context = (Context) host.findChild(key.getContextName());
+                if (context == null) {
+                    LOGGER.warn("singleSignOn.sessionExpire.contextNotFound, key: {}", key);
+                } else {
+                    Session session;
+                    try {
+                        session = this.manager.findSession(key.getSessionId());
+                    } catch (IOException ex) {
+                        LOGGER.warn("singleSignOn.sessionExpire.managerError, key: {}, exception: {}", key, ex);
+                        return;
+                    }
+
+                    if (session == null) {
+                        LOGGER.warn("singleSignOn.sessionExpire.sessionNotFound, key: {}", key);
+                    } else {
+                        session.expire();
+                    }
+                }
+            }
+        }
+    }
+}
--- a/src/main/java/tomcat/request/session/util/ConfigUtil.java
+++ b/src/main/java/tomcat/request/session/util/ConfigUtil.java
@ -0,0 +1,154 @@
+package tomcat.request.session.util;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import tomcat.request.session.annotation.Property;
+import tomcat.request.session.model.Config;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.lang.reflect.Field;
+import java.util.Properties;
+
+/** author: Ranjith Manickam @ 5 Feb' 2020 */
+public class ConfigUtil {
+
+    private static final Logger LOGGER = LoggerFactory.getLogger(ConfigUtil.class);
+
+    private static final String CONF = "conf";
+    private static final String CATALINA_BASE = "catalina.base";
+
+    /** To get application config. */
+    public static Config getConfig() {
+        Properties properties = getApplicationProperties();
+        Config config = new Config();
+
+        for (Field field : Config.class.getDeclaredFields()) {
+            Property property = field.getAnnotation(Property.class);
+            if (property == null) {
+                continue;
+            }
+
+            String propertyName = property.name();
+            Property.PropertyType propertyType = property.type();
+
+            if (propertyName.isEmpty()) {
+                continue;
+            }
+
+            String value = properties.getProperty(propertyName);
+            if (isSystemProperty(value)) {
+                value = getSystemProperty(value);
+            }
+
+            if (value == null || value.isEmpty()) {
+                value = property.defaultValue();
+
+                if (value.isEmpty()) {
+                    continue;
+                }
+            }
+
+            field.setAccessible(true);
+            try {
+                switch (propertyType) {
+                    case BOOLEAN:
+                        field.set(config, Boolean.parseBoolean(value));
+                        break;
+                    case INTEGER:
+                        field.set(config, Integer.parseInt(value));
+                        break;
+                    case LONG:
+                        field.set(config, Long.parseLong(value));
+                        break;
+                    case STRING:
+                    default:
+                        field.set(config, value);
+                        break;
+                }
+            } catch (Exception ex) {
+                LOGGER.error("Error while initializing application properties", ex);
+            }
+        }
+
+        return config;
+    }
+
+    /** To get redis data cache properties. */
+    private static Properties getApplicationProperties() {
+        Properties properties = new Properties();
+        try {
+            String filePath = System.getProperty(CATALINA_BASE)
+                    .concat(File.separator)
+                    .concat(CONF).concat(File.separator)
+                    .concat(Config.APPLICATION_PROPERTIES_FILE);
+
+            InputStream resourceStream = null;
+            try {
+                resourceStream = (!filePath.isEmpty() && new File(filePath).exists()) ? new FileInputStream(filePath) : null;
+                if (resourceStream == null) {
+                    LOGGER.info("Initializing tomcat redis session manager with default properties");
+                    ClassLoader loader = Thread.currentThread().getContextClassLoader();
+                    resourceStream = loader.getResourceAsStream(Config.APPLICATION_PROPERTIES_FILE);
+                }
+                properties.load(resourceStream);
+            } finally {
+                if (resourceStream != null) {
+                    resourceStream.close();
+                }
+            }
+        } catch (IOException ex) {
+            LOGGER.error("Error while retrieving application properties", ex);
+        }
+        return properties;
+    }
+
+    /**
+     * To get property with the specified key from system property.
+     *
+     * @param key - search key.
+     * @return - Returns the system property value.
+     */
+    private static String getSystemProperty(String key) {
+        int fromIndex = 0;
+
+        while (true) {
+            int beginIndex = key.indexOf("${", fromIndex);
+            int endIndex = key.indexOf("}", fromIndex);
+
+            if (beginIndex < 0 || endIndex < 0) {
+                break;
+            }
+
+            String expression = key.substring(beginIndex + 2, endIndex);
+            String value = System.getProperty(expression);
+
+            if (value == null || value.isEmpty()) {
+                fromIndex = endIndex + 1;
+                continue;
+            }
+
+            key = key.replace(String.format("${%s}", expression), value);
+        }
+
+        return key;
+    }
+
+    /**
+     * To check if the value is from system property.
+     *
+     * @param key - search key.
+     * @return - Returns true if the key start with '${' and ends with '}'.
+     */
+    private static boolean isSystemProperty(String key) {
+        if (key == null || key.isEmpty()) {
+            return false;
+        }
+
+        int beginIndex = key.indexOf("${");
+        int endIndex = key.indexOf("}");
+        return beginIndex >= 0 && endIndex >= 0 && beginIndex < endIndex;
+    }
+}
--- a/src/main/java/tomcat/request/session/util/SerializationUtil.java
+++ b/src/main/java/tomcat/request/session/util/SerializationUtil.java
@ -0,0 +1,101 @@
+package tomcat.request.session.util;
+
+import org.apache.catalina.util.CustomObjectInputStream;
+import tomcat.request.session.model.Session;
+import tomcat.request.session.model.SessionMetadata;
+import tomcat.request.session.model.SingleSignOnEntry;
+
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.security.MessageDigest;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Map;
+
+/** author: Ranjith Manickam @ 12 Jul' 2018 */
+public class SerializationUtil {
+
+    private ClassLoader loader;
+
+    /** To set class loader. */
+    public void setClassLoader(ClassLoader loader) {
+        this.loader = loader;
+    }
+
+    /** To get session attributes hash code. */
+    public byte[] getSessionAttributesHashCode(Session session) throws IOException {
+        byte[] serialized;
+        Map<String, Object> attributes = new HashMap<>();
+
+        for (Enumeration<String> enumerator = session.getAttributeNames();
+             enumerator.hasMoreElements(); ) {
+            String key = enumerator.nextElement();
+            attributes.put(key, session.getAttribute(key));
+        }
+
+        try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
+             ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(bos))) {
+            oos.writeUnshared(attributes);
+            oos.flush();
+            serialized = bos.toByteArray();
+        }
+
+        MessageDigest digester;
+        try {
+            digester = MessageDigest.getInstance("MD5");
+        } catch (Exception ex) {
+            throw new RuntimeException("Unable to get MessageDigest instance for MD5", ex);
+        }
+        return digester.digest(serialized);
+    }
+
+    /** To serialize session object. */
+    public byte[] serializeSessionData(Session session, SessionMetadata metadata) throws IOException {
+        byte[] serialized;
+        try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
+             ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(bos))) {
+            oos.writeObject(metadata);
+            session.writeObjectData(oos);
+            oos.flush();
+            serialized = bos.toByteArray();
+        }
+        return serialized;
+    }
+
+    /** To de-serialize session object. */
+    public void deserializeSessionData(byte[] data, Session session, SessionMetadata metadata)
+            throws IOException, ClassNotFoundException {
+        try (BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(data));
+             ObjectInputStream ois = new CustomObjectInputStream(bis, this.loader)) {
+            SessionMetadata serializedMetadata = (SessionMetadata) ois.readObject();
+            metadata.copyFieldsFrom(serializedMetadata);
+            session.readObjectData(ois);
+        }
+    }
+
+    /** To serialize single-sign-on entry. */
+    public byte[] serializeSingleSignOnEntry(SingleSignOnEntry entry) throws IOException {
+        byte[] serialized;
+        try (ByteArrayOutputStream bos = new ByteArrayOutputStream();
+             ObjectOutputStream oos = new ObjectOutputStream(new BufferedOutputStream(bos))) {
+            entry.writeObjectData(oos);
+            oos.flush();
+            serialized = bos.toByteArray();
+        }
+        return serialized;
+    }
+
+    /** To de-serialize single-sign-on entry. */
+    public void deserializeSingleSignOnEntry(byte[] data, SingleSignOnEntry entry)
+            throws IOException, ClassNotFoundException {
+        try (BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(data));
+             ObjectInputStream ois = new CustomObjectInputStream(bis, this.loader)) {
+            entry.readObjectData(ois);
+        }
+    }
+}
--- a/src/main/resources/donate.png
+++ b/src/main/resources/donate.png
--- a/src/main/resources/download_summary.html
+++ b/src/main/resources/download_summary.html
@ -0,0 +1,33 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
+    </head>
+    <body>
+        <div id="download_summary"></div>
+        <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script>
+        <script>
+            $( document ).ready(function() {
+                $.ajax({ 
+                    type: "GET",
+                    dataType: "jsonp",
+                    url: "https://api.github.com/repos/ran-jit/tomcat-cluster-redis-session-manager/releases",
+                    success: function(data){
+                        let content = "<table border='1px' style='width: 80%;margin-left: 10%;margin-right: 10%;line-height: 1.5;'><tr><th style='width: 30%;'>tag</th><th>asset name & download count</th></tr>";
+                        for(let i=0; i< data.data.length; i++) {
+                            const tag = data.data[i];
+                            for(var j=0; j< tag.assets.length; j++) {
+                                const asset = tag.assets[j];
+
+                                content = content + "<tr><td style='width: 10%;'>"+ tag.tag_name + "</td>";    
+                                content = content + "<td>" + asset.name + "<div style='text-align:right;'>" + asset.download_count + "</div></td></tr>";
+                            }
+                        }
+                        content = content + "</table>";
+                        document.getElementById("download_summary").innerHTML=content;
+                    }
+                });
+            });
+        </script>
+    </body>
+</html>
--- a/src/main/resources/readMe.txt
+++ b/src/main/resources/readMe.txt
@ -1,15 +1,13 @@
 /**
 * Tomcat clustering with Redis data-cache implementation.
 *
- * Tomcat clustering with Redis is the plugable one. It uses to store session objects to Redis data cache.
- *
- * @author Ranjith Manickam
- * @since 2.0
+ * author: Ranjith Manickam @ 12 Jul' 2018
 */

 Supports:
-   * Apache Tomcat 7
-   * Apache Tomcat 8
+   - Apache Tomcat 7
+   - Apache Tomcat 8
+   - Apache Tomcat 9

 Pre-requisite:
 	1. jedis.jar
@ -20,13 +18,13 @@ more details.. https://github.com/ran-jit/tomcat-cluster-redis-session-manager/w

 Steps to be done,
 	1. Move the downloaded jars to tomcat/lib directory
-		* tomcat/lib/
+		- tomcat/lib/

 	2. Add tomcat system property "catalina.base"
-		* catalina.base="TOMCAT_LOCATION"
+		- catalina.base="TOMCAT_LOCATION"

 	3. Extract downloaded package (tomcat-cluster-redis-session-manager.zip) to configure Redis credentials in redis-data-cache.properties file and move the file to tomcat/conf directory
-		* tomcat/conf/redis-data-cache.properties
+		- tomcat/conf/redis-data-cache.properties

 	4. Add the below two lines in tomcat/conf/context.xml
 		<Valve className="tomcat.request.session.redis.SessionHandlerValve" />
@ -38,4 +36,5 @@ Steps to be done,
 		<session-config>

 Note:
-  * This supports, both redis stand-alone and multiple node cluster based on the redis-data-cache.properties configuration.
+  - All your session attribute values must implement java.io.Serializable.
+  - Supports redis default, sentinel and cluster based on the redis-data-cache.properties configuration.
--- a/src/main/resources/redis-data-cache.properties
+++ b/src/main/resources/redis-data-cache.properties
@ -1,16 +1,39 @@
 #-- Redis data-cache configuration

-#- redis hosts ex: 127.0.0.1:6379, 127.0.0.2:6379, 127.0.0.2:6380, ....
+# - ${ENV_VARIABLE_NAME}
+
+#- redis hosts. ex: 127.0.0.1:6379, 127.0.0.2:6379, 127.0.0.2:6380, ....
 redis.hosts=127.0.0.1:6379

-#- redis password (for stand-alone mode)
+#- redis password.
 #redis.password=

-#- set true to enable redis cluster mode
+#- set true to enable redis cluster mode. (default value: false)
 redis.cluster.enabled=false

-#- redis database (default 0)
+#- set true to enable redis sentinel mode. (default value: false)
+redis.sentinel.enabled=false
+# redis sentinel master name. (default value: mymaster)
+redis.sentinel.master=mymaster
+
+#- redis database. (default value: 0)
 #redis.database=0

-#- redis connection timeout (default 2000)
+#- redis connection timeout. (default value: 2000 ms)
 #redis.timeout=2000
+
+#- enable redis and standard session mode. (default value: false)
+# If enabled,
+#   1. Must be enabled sticky session in your load balancer configuration. Else this manager may not return the updated session values.
+#   2. Session values are stored in local jvm and redis.
+#   3. If redis is down/not responding, requests uses jvm stored session values to process user requests. Redis comes back the values will be synced.
+lb.sticky-session.enabled=false
+
+#- session persistent policies. (default value: DEFAULT) ex: DEFAULT, SAVE_ON_CHANGE
+# policies - DEFAULT, SAVE_ON_CHANGE, ALWAYS_SAVE_AFTER_REQUEST
+#   1. SAVE_ON_CHANGE: every time session.setAttribute() or session.removeAttribute() is called the session will be saved.
+#   2. ALWAYS_SAVE_AFTER_REQUEST: force saving after every request, regardless of whether or not the manager has detected changes to the session.
+session.persistent.policies=DEFAULT
+
+#- single-sign-on session timeout. (default value: 0 ms (-no expiry))
+redis.sso.timeout=0
Author	SHA1	Message	Date
Ranjith Manickam	d0de8bb6e2	Update README.md	2020-12-23 13:00:58 +05:30
Ranjith Manickam	8593f88243	update downloads badge	2020-12-23 12:50:14 +05:30
Ranjith Manickam	9da24f2328	Add maven repo	2020-12-23 12:38:24 +05:30
Ranjith Manickam	e31ea59636	Add maven repo	2020-12-23 12:28:11 +05:30
Ranjith Manickam	45b0b98725	Update README.md	2020-11-08 09:58:03 +05:30
Ranjith Manickam	2e505deee1	Update README.md	2020-05-15 16:11:45 +05:30
Ranjith Manickam	df80fa0da3	Update README.md	2020-05-13 11:10:57 +05:30
Ranjith Manickam	f4c6322793	Update pom.xml	2020-05-13 11:08:04 +05:30
Ranjith Manickam	a0eab9407e	version update	2020-05-13 11:03:04 +05:30
Ranjith Manickam	1f6e57c164	Fix for - NPE in SessionHandlerValve.java accessing Tomcat's /manager app	2020-05-13 11:02:21 +05:30
Ranjith Manickam	5d0c7aa7a1	Update README.md	2020-05-02 14:53:18 +05:30
Ranjith Manickam	3916e217a5	Update pom.xml	2020-05-02 14:45:13 +05:30
Ranjith Manickam	39df08832a	changes to support single-sign-on (sso)	2020-05-02 14:39:17 +05:30
Ranjith Manickam	372332e8dc	changes to support single-sign-on (sso)	2020-04-10 07:23:00 +05:30
Ranjith Manickam	7ace9f2b7b	changes to support single-sign-on (sso)	2020-04-08 20:59:24 +05:30
Ranjith Manickam	0ecdfc2661	changes to support single-sign-on (sso)	2020-04-08 20:57:07 +05:30
Ranjith Manickam	80acc01418	changes to support single-sign-on (sso)	2020-04-02 12:44:40 +05:30
Ranjith Manickam	ab04189b93	Update pom.xml	2020-03-22 00:27:41 +05:30
Ranjith Manickam	246b64def9	Merge pull request #52 from ran-jit/sso changes to support single-sign-on (sso)	2020-03-22 00:25:18 +05:30
Ranjith Manickam	2b13fdadc9	changes to support single-sign-on (sso)	2020-03-20 23:51:51 +05:30
Ranjith Manickam	16fffca534	updated download summary	2020-02-09 16:23:54 +05:30
Ranjith Manickam	b1d33afd0a	update	2020-02-09 16:20:57 +05:30
Ranjith Manickam	920662654e	Update README.md	2020-02-09 16:17:36 +05:30
Ranjith Manickam	905ae577c5	Update README.md	2020-02-08 19:13:06 +05:30
Ranjith Manickam	45b1c5a9b0	Update README.md	2020-02-08 19:10:26 +05:30
Ranjith Manickam	9a409e43a4	Update README.md	2020-02-06 10:28:09 +05:30
Ranjith Manickam	113933975c	application config system property support changes	2020-02-05 19:37:31 +05:30
Ranjith Manickam	f45e1b23a9	application config system property support changes	2020-02-05 17:29:47 +05:30
Ranjith Manickam	b73c1b78c2	Update README.md	2019-10-03 12:42:21 +05:30
Ranjith Manickam	094f612138	Update README.md	2019-09-04 22:03:25 +05:30
Ranjith Manickam	3d5afda53e	Update README.md	2019-08-15 13:14:55 +05:30
Ranjith Manickam	8902534782	Update README.md	2019-08-12 19:41:01 +05:30
Ranjith Manickam	7ea845ebca	tomcat session persistent policy update	2019-08-12 19:29:32 +05:30
Ranjith Manickam	4eb0e433b1	Update README.md	2019-07-04 02:42:00 +05:30
Ranjith Manickam	df14798b1c	Update README.md	2019-07-04 02:28:23 +05:30
Ranjith Manickam	a0c0a81332	update..	2019-07-04 02:23:30 +05:30
Ranjith Manickam	43816ec3c7	Update README.md	2019-06-04 22:43:28 +05:30
Ranjith Manickam	8dcdb983fa	Update pom.xml	2019-05-25 01:40:11 +05:30
Ranjith Manickam	068967a773	Update pom.xml	2019-05-20 04:28:19 +05:30
Ranjith Manickam	bbb4023689	Jedis version upgradation fixes.	2019-05-20 03:23:33 +05:30
Ranjith Manickam	82fb1baa19	version update.	2019-05-20 01:49:58 +05:30
Ranjith Manickam	b2b2da64f2	version update	2019-05-20 01:49:13 +05:30
Ranjith Manickam	180240b5bb	Jedis version updated from 2.9.0 to 3.0.1 for solving redis cluster fixes	2019-05-20 01:36:38 +05:30
Ranjith Manickam	b895652ed0	Update README.md	2019-04-27 17:53:12 +05:30
Ranjith Manickam	02004d5bd0	Update README.md	2019-04-27 17:50:15 +05:30
Ranjith Manickam	11e7525e32	Update pom.xml	2019-04-11 00:10:49 +05:30
Ranjith Manickam	b3bdf8308c	Session remove fixes..	2019-04-09 18:06:07 +05:30
Ranjith Manickam	e631a027ff	Merge pull request #27 from ran-jit/add-license-1 Added LICENSE.md	2019-01-08 21:31:06 +05:30
Ranjith Manickam	8b31223ba6	Create LICENSE.md	2019-01-08 21:30:37 +05:30
Ranjith Manickam	785b629f28	Updated configuration properties.	2018-12-05 02:40:45 +05:30
Ranjith Manickam	40fca0c65f	Updated configuration properties.	2018-12-05 02:38:01 +05:30
Ranjith Manickam	35787c2708	Updated configuration properties.	2018-12-05 02:31:53 +05:30
Ranjith Manickam	aa52190ed1	Updated configuration properties.	2018-12-05 02:30:20 +05:30
Ranjith Manickam	b89e5df0ef	Bug fixes and added redis sentinel supportability changes.	2018-12-05 01:57:32 +05:30
Ranjith Manickam	4abfa4b37a	Bug fixes and added redis sentinel supportability changes.	2018-12-05 01:56:23 +05:30
Ranjith Manickam	de63bca985	Bug fixes and added redis sentinel supportability changes.	2018-12-05 00:30:13 +05:30
Ranjith Manickam	aac6ee85f9	Bug fixes and added redis sentinel supportability changes.	2018-12-04 03:17:42 +05:30
Ranjith Manickam	ecca5a5794	Bug fixes and added redis sentinel supportability changes.	2018-12-04 03:11:58 +05:30
Ranjith Manickam	551a855675	Bug fixes and added redis sentinel supportability changes.	2018-12-04 03:05:05 +05:30
Ranjith Manickam	8aa5359453	Bug fixes and added redis sentinel supportability changes.	2018-12-04 02:43:03 +05:30
Ranjith Manickam	c41cfedd77	Bug fixes and added redis sentinel supportability changes.	2018-12-04 01:39:28 +05:30
Ranjith Manickam	2b09e15466	Bug fixes and added redis sentinel supportability changes.	2018-12-04 01:14:16 +05:30
Ranjith Manickam	c4f205cb51	Bug fixes and added redis sentinel supportability changes.	2018-12-04 01:12:08 +05:30
Ranjith Manickam	f48861ad95	Bug fixes and added redis sentinel supportability changes.	2018-12-03 00:40:45 +05:30
Ranjith Manickam	6d58ee6d44	Bug fixes and added redis sentinel supportability changes.	2018-12-03 00:15:39 +05:30
Ranjith Manickam	9238d1ee9d	Bug fixes and added redis sentinel supportability changes.	2018-12-03 00:06:37 +05:30
Ranjith Manickam	d4a2a68a8a	Bug fixes and added redis sentinel supportability changes.	2018-12-02 23:47:55 +05:30
Ranjith Manickam	92adf755ba	Bug fixes and added redis sentinel supportability changes.	2018-12-02 23:43:37 +05:30
Ranjith Manickam	a95d5d9f5c	Updated readme for sentinel supportability..	2018-12-02 23:29:49 +05:30
Ranjith Manickam	8941013e6f	Updated readme for sentinel supportability..	2018-12-02 23:28:15 +05:30
Ranjith Manickam	99813fecc0	removed unused files.	2018-12-02 23:20:30 +05:30
Ranjith Manickam	d562a03d63	Bug fixes and added redis sentinel supportability changes.	2018-12-02 23:18:28 +05:30
Ranjith Manickam	9069315d96	Update readMe.txt	2018-11-30 17:23:21 +05:30
Ranjith Manickam	7a0e0cd63a	Update README.md	2018-11-30 17:19:45 +05:30
Ranjith Manickam	fbff128b98	Update README.md	2018-11-30 17:19:04 +05:30
Ranjith Manickam	18819ce619	Update README.md	2018-10-13 03:05:36 +05:30
Ranjith Manickam	aca60da9df	Update README.md	2018-10-13 03:05:01 +05:30
Ranjith Manickam	628f7b406a	Updated intellij files.	2018-08-18 20:21:23 +05:30
Ranjith Manickam	3e7d764356	Update..	2018-07-12 15:39:01 +05:30
Ranjith Manickam	a5dbb89e0d	version changes..	2018-07-09 18:20:11 +05:30
Ranjith Manickam	3164b1e59b	Merge pull request #15 from ran-jit/ranjith/2.0.5 Ranjith/2.0.5	2018-07-09 18:15:29 +05:30
Ranjith Manickam	6aff279fbd	Code cleanup	2018-07-09 18:12:27 +05:30
Ranjith Manickam	6a65b99e24	Redis cache changes.	2018-07-05 19:03:13 +05:30
Ranjith Manickam	e904a8a2c8	Update README.md	2018-04-28 20:55:57 +05:30
Keerthana	b745ce003c	version upgrade..	2018-04-28 20:50:03 +05:30
Keerthana	05c9b7adc9	session expire timeout issue fixes..	2018-04-28 20:46:55 +05:30
Ranjith Manickam	ac38594ff7	version update..	2018-04-20 13:21:03 +05:30