[jboss-dev-forums] [JBoss AS7 Development] - Re: Issues with modular classloading

[Brian Stansberry]

Brian Stansberry [http://community.jboss.org/people/bstansberry%40jboss.com] created the discussion

"Re: Issues with modular classloading"

To view the discussion, visit: http://community.jboss.org/message/565928#565928

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Another issue I'm seeing is deployment processor failures processing managed bean jars:

> 14:11:52,800 INFO  [stdout] @javax.annotation.Resource(shareable=true, mappedName=, description=, name=, type=class java.lang.Object, authenticationType=CONTAINER) null
> 14:11:52,800 INFO  [stdout] interface javax.annotation.Resource ClassLoader for Module "module:javax.annotation.api:main"
> 14:11:52,801 ERROR [deployment] Caught exception handling update (param is f91250dd-121a-4c01-9407-1c91cb53e5cd): java.lang.NullPointerException
>     at org.jboss.as.deployment.managedbean.processors.ManagedBeanAnnotationProcessor.processFieldResource(ManagedBeanAnnotationProcessor.java:295)
>     at org.jboss.as.deployment.managedbean.processors.ManagedBeanAnnotationProcessor.processResources(ManagedBeanAnnotationProcessor.java:261)
>     at org.jboss.as.deployment.managedbean.processors.ManagedBeanAnnotationProcessor.processDeployment(ManagedBeanAnnotationProcessor.java:125)
>     at org.jboss.as.deployment.chain.DeploymentChainImpl.processDeployment(DeploymentChainImpl.java:60)
>     at org.jboss.as.model.ServerDeploymentStartStopHandler.activate(ServerDeploymentStartStopHandler.java:191)
>     at org.jboss.as.model.ServerDeploymentStartStopHandler.deploy(ServerDeploymentStartStopHandler.java:87)
>     at org.jboss.as.model.ServerDeploymentStartStopHandler.deploy(ServerDeploymentStartStopHandler.java:71)
>     at org.jboss.as.model.ServerDeploymentStartStopHandler.redeploy(ServerDeploymentStartStopHandler.java:117)
>     at org.jboss.as.model.ServerModelDeploymentFullReplaceUpdate.applyUpdate(ServerModelDeploymentFullReplaceUpdate.java:75)
>     at org.jboss.as.server.mgmt.ServerUpdateController$ServerModelUpdateTuple.applyUpdate(ServerUpdateController.java:387)
>     at org.jboss.as.server.mgmt.ServerUpdateController$ServerModelUpdateTuple.access$200(ServerUpdateController.java:357)
>     at org.jboss.as.server.mgmt.ServerUpdateController.applyUpdates(ServerUpdateController.java:182)
>     at org.jboss.as.server.mgmt.ServerUpdateController.executeUpdates(ServerUpdateController.java:139)
>     at org.jboss.as.server.mgmt.deployment.ServerDeploymentManagerImpl$2.run(ServerDeploymentManagerImpl.java:218)
>     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) [:1.6.0_20]
>     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) [:1.6.0_20]
>     at java.lang.Thread.run(Thread.java:637) [:1.6.0_20]
> 

The NPE happens because a lookup in a Map<Class, Annotation> is unexpectedly returning null. It returns null because the Resource.class passed to the lookup is loaded from a different CL from the Resource.class that's a key in the map.  The first couple lines of logging above are some debug output I threw in; the first line shows the map key was loaded from the system CL while the param was loaded from a module.

I think the problem here is the javax.annotation.api module includes classes that are in the 'system' module.
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