[jboss-jira] [JBoss JIRA] (WFLY-12032) java.rmi is not visible from wildfly.extension.io module

[David Lloyd (Jira)]

    [ https://issues.jboss.org/browse/WFLY-12032?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13727754#comment-13727754 ] 

David Lloyd commented on WFLY-12032:
------------------------------------

Sure, it is related to class loading, but that's a very broad area with impacts in many systems and doesn't always mean it's a problem with JBoss Modules.  In particular JBoss Modules is not sensitive to time delays, as its class loading algorithm is generally deterministic.  In this case I'd look at how RMI is maintaining its resolution cache; perhaps the cache is not updated until after the entire message is deserialized.

> java.rmi is not visible from wildfly.extension.io module
> --------------------------------------------------------
>
>                 Key: WFLY-12032
>                 URL: https://issues.jboss.org/browse/WFLY-12032
>             Project: WildFly
>          Issue Type: Bug
>    Affects Versions: 16.0.0.Final
>            Reporter: Tomas Hofman
>            Priority: Major
>
> This is follow up issue for JBEAP-16725, which was resolved with a workaround - javax.rmi was added as a dependency of wildfly.extension.io module.
> The root cause is probably inside jboss-modules.
> The issue is following:
> * a standalone EJB client invokes remote EJB, and passes an object as an argument;
> * server (trying to use the remote object) fails with "java.lang.ClassNotFoundException: java.rmi.dgc.Lease" (stacktrace bellow).
> If a short delay ({{Thread.sleep(100)}}) is introduced on the server side, before manipulating the remote object, the invocation succeeds.
> {code}
> java.lang.ClassNotFoundException: java.rmi.dgc.Lease from [Module "org.wildfly.extension.io" version 6.0.12.Final-redhat-00001 from local module loader @6a024a67 (finder: local module finder @7921b0a2 (roots: /tmp/jboss-eap-7.2/modules,/tmp/jboss-eap-7.2/modules/system/layers/base))] (no security manager: RMI class loader disabled)
> (default task-2) java.lang.ClassNotFoundException.<init>(ClassNotFoundException.java:97)
> (default task-2) sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:396)
> (default task-2) sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:186)
> (default task-2) java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:637)
> (default task-2) java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:264)
> (default task-2) sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:219)
> (default task-2) java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1868)
> (default task-2) java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1751)
> (default task-2) java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2042)
> (default task-2) java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1573)
> (default task-2) java.io.ObjectInputStream.readObject(ObjectInputStream.java:431)
> (default task-2) sun.rmi.transport.DGCImpl_Stub.dirty(DGCImpl_Stub.java:125)
> (default task-2) sun.rmi.transport.DGCClient$EndpointEntry.makeDirtyCall(DGCClient.java:382)
> (default task-2) sun.rmi.transport.DGCClient$EndpointEntry.registerRefs(DGCClient.java:324)
> (default task-2) sun.rmi.transport.DGCClient.registerRefs(DGCClient.java:160)
> (default task-2) sun.rmi.transport.LiveRef.read(LiveRef.java:312)
> (default task-2) sun.rmi.server.UnicastRef.readExternal(UnicastRef.java:489)
> (default task-2) java.rmi.server.RemoteObject.readObject(RemoteObject.java:455)
> (default task-2) sun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
> (default task-2) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
> (default task-2) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> (default task-2) java.lang.reflect.Method.invoke(Method.java:498)
> (default task-2) org.jboss.marshalling.reflect.JDKSpecific$SerMethods.callReadObject(JDKSpecific.java:179)
> (default task-2) org.jboss.marshalling.reflect.SerializableClass.callReadObject(SerializableClass.java:212)
> (default task-2) org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1746)
> (default task-2) org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1715)
> (default task-2) org.jboss.marshalling.river.RiverUnmarshaller.doInitSerializable(RiverUnmarshaller.java:1715)
> (default task-2) org.jboss.marshalling.river.RiverUnmarshaller.doReadNewObject(RiverUnmarshaller.java:1395)
> (default task-2) org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:272)
> (default task-2) org.jboss.marshalling.river.RiverUnmarshaller.doReadObject(RiverUnmarshaller.java:205)
> (default task-2) org.jboss.marshalling.AbstractObjectInput.readObject(AbstractObjectInput.java:41)
> (default task-2) org.jboss.ejb.protocol.remote.EJBServerChannel$RemotingInvocationRequest.getRequestContent(EJBServerChannel.java:813)
> (default task-2) org.jboss.as.ejb3.remote.AssociationImpl.receiveInvocationRequest(AssociationImpl.java:130)
> (default task-2) org.jboss.ejb.protocol.remote.EJBServerChannel$ReceiverImpl.handleInvocationRequest(EJBServerChannel.java:451)
> (default task-2) org.jboss.ejb.protocol.remote.EJBServerChannel$ReceiverImpl.handleMessage(EJBServerChannel.java:189)
> (default task-2) org.jboss.remoting3.remote.RemoteConnectionChannel.lambda$handleMessageData$3(RemoteConnectionChannel.java:430)
> (default task-2) org.jboss.remoting3.EndpointImpl$TrackingExecutor.lambda$execute$0(EndpointImpl.java:949)
> (default task-2) org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
> (default task-2) org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:1985)
> (default task-2) org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1487)
> (default task-2) org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1378)
> (default task-2) java.lang.Thread.run(Thread.java:748)
> {code}



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