This might be due to a JRE version mismatch (the one you're using, the one used to
compile that library, etc)
View the original post :
http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4161476#...
Reply to the post :
http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...