Fixing Sonar issues.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/proxy/branches/version-2.0-work@1508298 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/stub/src/main/java/org/apache/commons/proxy2/stub/TrainingContext.java b/stub/src/main/java/org/apache/commons/proxy2/stub/TrainingContext.java
index ee4700a..6ab2ec2 100644
--- a/stub/src/main/java/org/apache/commons/proxy2/stub/TrainingContext.java
+++ b/stub/src/main/java/org/apache/commons/proxy2/stub/TrainingContext.java
@@ -30,7 +30,7 @@
 import java.util.LinkedList;
 import java.util.List;
 
-public class TrainingContext
+public final class TrainingContext
 {
 //----------------------------------------------------------------------------------------------------------------------
 // Fields