This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
Please post the full stack trace for the error. Make sure you post only the first exception stack trace from the console log. Do not post the "Deployments in Error" report as that it usually useless in identifying the root cause of problems. Also post the version of JBoss AS, OS and JVM.
Alternately, you could attach the server.log and boot.log files.