It's the exception stack trace in the console log. Finally i have got a solution, problem comes with libraries for GWT 1.5 gwt-user.jar gwt-servet.jar In ENV1 there was and there is no problem at all. In ENV2 with JBossAS5.GA solution is not deploying gwt-user.jar. I have read that there has been some changes in ClassLoader so i suppose that ENV 1 runs because of some kind of bug, maybe. Anyway, thank you very much sergi View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4204272#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...