JBoss application classloaders leak because of unclosed EJBReceiverContexts and EJBClientContexts

Environment

• JBoss Enterprise Application Platform (EAP) 6.x

Issue

• Classloaders for our application leak across redeploys leading to a PermGen OOME when the application defines a client context in its jboss-ejb-client.xml:

    <client-context>
        <ejb-receivers>
            <remoting-ejb-receiver outbound-connection-ref="remote-ejb-connection" />
        </ejb-receivers>        
    </client-context>

Resolution

• Await a forthcoming fix in a later release

Diagnostic Steps

• Identify any application classloaders in your heap dump with the below Eclipse MAT OQL and check if they are persisted by EJB receiver and client contexts:

SELECT module.identifier.name.value.toString() FROM org.jboss.modules.ModuleClassLoader WHERE (module.identifier.name.value.toString() LIKE "deployment.*")

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