Remove redundant modifiers like static on enums.
diff --git a/src/test/java/org/apache/commons/configuration2/SynchronizerTestImpl.java b/src/test/java/org/apache/commons/configuration2/SynchronizerTestImpl.java
index 4c2d9eb..76e1f2f 100644
--- a/src/test/java/org/apache/commons/configuration2/SynchronizerTestImpl.java
+++ b/src/test/java/org/apache/commons/configuration2/SynchronizerTestImpl.java
@@ -152,7 +152,7 @@
     /**
      * An enumeration with the methods of the Synchronizer which can be called.
      */
-    public static enum Methods
+    public enum Methods
     {
         BEGIN_READ, END_READ, BEGIN_WRITE, END_WRITE
     }