diff --git a/config/checkstyle/checkstyle.xml b/config/checkstyle/checkstyle.xml
index 47422c615..6915dd0d1 100644
--- a/config/checkstyle/checkstyle.xml
+++ b/config/checkstyle/checkstyle.xml
@@ -12,8 +12,8 @@
     <module name="FileTabCharacter"/>
 
     <module name="RegexpSingleline">
-        <property name="format" value="System\.out"/>
-        <property name="message" value="Prohibit invoking System.out in source code !"/>
+        <property name="format" value="^.*System\.(out|err).*$"/>
+        <property name="message" value="Don't use System.out/err, use SLF4J instead."/>
     </module>
 
     <module name="FileLength">
@@ -21,7 +21,11 @@
     </module>
 
     <module name="TreeWalker">
-
+        <module name="SuppressionCommentFilter">
+            <property name="offCommentFormat" value="CS:OFF:BEGIN"/>
+            <property name="onCommentFormat" value="CS:OFF:END"/>
+            <property name="checkFormat" value=".*"/>
+        </module>
         <module name="UnusedImports">
             <property name="processJavadoc" value="true"/>
         </module>
@@ -83,7 +87,6 @@
         <module name="MethodParamPad"/>
         <module name="ParenPad"/>
         <module name="TypecastParenPad"/>
-        <module name="TypecastParenPad"/>
 
     </module>
 
diff --git a/src/main/java/run/halo/app/Application.java b/src/main/java/run/halo/app/Application.java
index bcb0a9e63..3b171a1e6 100755
--- a/src/main/java/run/halo/app/Application.java
+++ b/src/main/java/run/halo/app/Application.java
@@ -29,7 +29,6 @@ public class Application extends SpringBootServletInitializer {
 
         // Run application
         CONTEXT = SpringApplication.run(Application.class, args);
-
     }
 
     /**