getCause(Throwable): Perform a softer check on the return type of the

argument's getCause() method, doing isAssignableFrom() instead of a
hard memory address comparison.


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@136962 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/commons/lang/exception/ExceptionUtils.java

@@ -124,7 +124,8 @@ public class ExceptionUtils
             {
             }
 
-            if (getCause != null && getCause.getReturnType() == Throwable.class)
+            if (getCause != null &&
+                Throwable.class.isAssignableFrom(getCause.getReturnType()))
             {
                 try
                 {