Bug fixes and added redis sentinel supportability changes.

src/main/java/tomcat/request/session/data/cache/impl/redis/AbstractRedisUtil.java

@@ -7,7 +7,7 @@ import redis.clients.jedis.exceptions.JedisConnectionException;
 import redis.clients.util.Pool;
 import tomcat.request.session.data.cache.DataCache;
 
-/** author: Ranjith Manickam @ 12 Jul' 2018 */
+/** author: Ranjith Manickam @ 3 Dec' 2018 */
 public abstract class AbstractRedisUtil implements DataCache {
 
     private static final int NUM_RETRIES = 3;

src/main/java/tomcat/request/session/data/cache/impl/redis/RedisSentinelUtil.java

@@ -5,7 +5,7 @@ import redis.clients.jedis.JedisSentinelPool;
 
 import java.util.Set;
 
-/** author: Ranjith Manickam @ 12 Jul' 2018 */
+/** author: Ranjith Manickam @ 3 Dec' 2018 */
 class RedisSentinelUtil extends AbstractRedisUtil {
 
     private static final long FAILIURE_WAIT_TIME = 2000L;

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 could process your request. Please contact system administrator for more details.";
+
+    public BackendException() {
+        super(ERROR_MESSAGE, null, false, false);
+    }
+}

src/main/java/tomcat/request/session/redis/SessionHandlerValve.java

@@ -1,16 +1,20 @@
 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.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import tomcat.request.session.exception.BackendException;
+
+import javax.servlet.ServletException;
+import java.io.IOException;
 
 /** author: Ranjith Manickam @ 12 Jul' 2018 */
 public class SessionHandlerValve extends ValveBase {
 
+    private static final Log LOGGER = LogFactory.getLog(SessionHandlerValve.class);
+
     private SessionManager manager;
 
     /** To set session manager */
@@ -23,6 +27,9 @@ public class SessionHandlerValve extends ValveBase {
     public void invoke(Request request, Response response) throws IOException, ServletException {
         try {
             getNext().invoke(request, response);
+        } catch (IOException | ServletException | RuntimeException ex) {
+            LOGGER.error("Error processing request", ex);
+            new BackendException();
         } finally {
             manager.afterRequest(request);
         }

src/main/resources/redis-data-cache.properties

@@ -3,7 +3,7 @@
 #- 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 (used for default and sentinel mode)
+#- redis password
 #redis.password=
 
 #- set true to enable redis cluster mode