I can't test my project right now, but I tested JBoss Booking Example. And it crash AS 4.2 GA. Just change application.xml with: | <module> | <java>jboss-el-api.jar</java> | </module> | and add this jar in ear. Start JBoss and this will take 100% of CPU ou core forever (in fact, I don't wait too much). Note: it's not necessary cut off jboss-el.jar /el-ri.jar Thank you!!! I think you catch it!!! View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4048087#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...