Deploying Sonar to JBoss AS7
Sonar does not officially support the JBoss AS7 application server / servlet container (or any JBoss version). By default, JBoss's JPA modules notice the persistence.xml file in sonar-core-2.13.1.jar!/META-INF/persistence.xml and attempt to setup JPA (Hibernate). This fails (because Sonar isn't expecting JBoss to be doing anything in the way of setting up Hibernate). One solution is to remove the JPA module from JBoss.
I am using JBoss AS7 with the standalone/configuration/standalone.xml. I commented out the two sections:
...
<extensions>
...
<!-- <extension module="org.jboss.as.jpa"/> -->
...
<extensions>
...
<!--
<subsystem xmlns="urn:jboss:domain:jpa:1.0">
<jpa default-datasource=""/>
</subsystem>
-->
...
After this, I was able to follow the Sonar Installation Instructions.
Obviously, this solution will not work if you were using JBoss's JPA module for other deployed applications. I'm not sure if there is a way to disable it on a per-application basis.
Others have had problems deploying Sonar to JBoss. This led me to the same problem with another application (jbpm5 and JBoss AS7) which clued me in to the solution.