Index: common/common-util/src/main/java/com/sun/enterprise/loader/ASURLClassLoader.java =================================================================== --- common/common-util/src/main/java/com/sun/enterprise/loader/ASURLClassLoader.java (revision 39992) +++ common/common-util/src/main/java/com/sun/enterprise/loader/ASURLClassLoader.java (working copy) @@ -563,7 +563,8 @@ _logger.log(Level.WARNING, "loader.asurlclassloader_done_already_called", new Object[] { name, doneSnapshot }); - return null; + // return an empty enumeration instead of null. See issue #13096 + return Collections.enumeration(Collections.EMPTY_LIST); } List resourcesList = new ArrayList();