Here's the answer http://wiki.jboss.org/wiki/Wiki.jsp?page=ClassNotFoundJava.lang.StringInJDK6 View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4048480#4048480 Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&p=4048480