[jboss-dev-forums] [Design of POJO Server] - JBAS-5376: leak of webapp classloader when deployed in ear

[bstansberry@jboss.com]

Discussion of http://jira.jboss.com/jira/browse/JBAS-5376.

I've walked through the deploy/undeploy of an ear with an embedded war, and here's what I see. During deployment of the nested war:

AbstractLevelClassLoaderSystemDeployer.createClassLoader(DeploymentUnit) -->
VFSDeploymentClassLoaderPolicyModule.registerClassLoaderPolicy(ClassLoaderSystem system, ClassLoader parent) -->
DefaultClassLoaderSystem.registerClassLoaderPolicy(String domainName, ParentPolicy parentPolicy, Loader parent, ClassLoaderPolicy policy) -->
ClassLoaderSystem.createAndRegisterDomain(String name, ParentPolicy parentPolicy, Loader parent)

Here we create a domain for the war and assign param "Loader parent" to the new domain as it's parent.  "Loader parent" has a ref to the ear classloader. We then register the new domain with the classloader system.  This sets up the chain of references shown in the JIRA description.

During undeploy:

AbstractLevelClassLoaderSystemDeployer.removeClassLoader(DeploymentUnit unit) -->
BaseClassLoaderSystem.unregisterClassLoader(ClassLoader classLoader) -->
BaseClassLoaderSystem.unregisterClassLoaderPolicy(ClassLoaderPolicy policy)

that removes the ref to the *war's* poliyc/classloader from the war's domain, But the war domain itself is never unregistered from the ClassLoaderSystem. So the ref to the parent is leaked.

In an eclipse I don't see any calls at all to ClassLoaderSystem.unregisterDomain(ClassLoaderDomain domain) anywhere. ClassLoaderSystem.shutdown() removes all domains, but that doesn't help here.



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