Is that all you seen in the error logs? Those logs don't show the exact error. If there's anything more that's logged on the console, please post that too. Does this error occur when you run the server from the command prompt instead of the IDE? By the way, if possible, please post in english :) Many here may not know Polish language. I had to use google translator to figure out which language you had posted in :) View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4267028#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...