LANG-744 StringUtils throws java.security.AccessControlException on Google App Engine

Display both Java6 and Sun exceptions when neither is available for stripAccents

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/lang/trunk@1166786 13f79535-47bb-0310-9956-ffa450edef68

src/main/java/org/apache/commons/lang3/StringUtils.java

@@ -636,8 +636,9 @@ public class StringUtils {
                 result = removeAccentsSUN(input);
             } else {
                 throw new UnsupportedOperationException(
-                    "The stripAccents(CharSequence) method requires at least Java 1.6 or a Sun JVM",
-                    new UnsupportedOperationException(java6Exception));
+                    "The stripAccents(CharSequence) method requires at least"
+                        +" Java6, but got: "+java6Exception
+                        +"; or a Sun JVM: "+sunException);
             }
             // Note that none of the above methods correctly remove ligatures...
             return result;