This week's book giveaway is in the OCMJEA forum. We're giving away four copies of OCM Java EE 6 Enterprise Architect Exam Guide and have Paul Allen & Joseph Bambara on-line! See this thread for details.
I havent really read your code because am in a hurry but i thought a quick answer might help you. I was experiencing the same problem while deploying in tomcat 6. The problem was being caused by catalina.jar in the war file.
Try cleaning up the war (remove jars files from the war's lib folder that are present in tomcat's lib folder) they deploy.