I am not sure this is a bug in AS. Do you by any chance package any jboss specific jars files in the application? Or any jar files contain jnp.* packages? If yes, try removing them. If none of this applies, please post the entire exception stacktrace and also the appropriate contents of the EAR, which you can get using: jar -tf myapp.ear While posting logs or xml content or code, please remember to wrap it in a code block by using the Code button in the message editor window. Please use the Preview button to ensure that your post is correctly formatted. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4261819#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...