This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori 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?