This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
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As for the exception:
19:26:53,761 ERROR [WebModule] Could not create JSR-77 WebModule: web.xml: javax.management.InstanceAlreadyExistsException: jboss.management.local:j2eeType=WebModule,J2EEServer=Local,J2EEApplication=null,name=web.xml already registered.
It looks like you are deploying an application which is already deployed. The name of that application "web.xml" looks suspicious though. Can you provide more details about your application including what it is and how it is packaged?