You have to give us more details about your setup and the error that you are seeing. Which version of JBoss and Java do you use? How do you start JBoss and what exception do you see when you start it. Please post the entire exception stacktrace and also the console log.
While posting the logs or code or xml content, remember to wrap it in a code block using the Code button in the message editor window and please hit the Preview button to make sure your post is correctly formatted