4:50 p.m.
ClassCastExceptions arising from Unmarsharller/Classloader caching in
MicroRemoteClientInvoker
----------------------------------------------------------------------------------------------
Key: JBREM-1127
URL: https://jira.jboss.org/jira/browse/JBREM-1127
Project: JBoss Remoting
Issue Type: Bug
Security Level: Public (Everyone can see)
Affects Versions: 2.2.2.SP11, 2.2.2.SP10, 2.2.2.SP9, 2.2.2.SP8, 2.2.2.SP7, 2.2.2.SP5,
2.2.2.SP4, 2.2.2.GA_CP03, 2.2.2.GA_CP02, 2.2.2.SP2, 2.2.2.SP1, 2.2.2.GA_CP01, 2.2.2.GA,
2.2.1.GA, 2.2.0.SP4, 2.2.0.SP3, 2.2.0.SP2, 2.2.0.SP1, 2.2.0.GA (Bluto)
Reporter: Galder Zamarreño
Priority: Critical
Classloading when accessing a remote bean from within 2 separate isolated EARs in AS is
broken.
Let's say you have a bean, A, deployed in node2 and this bean is accessed from two
isolated EARs in node1 and this bean returns a instance of Foo. If you run paralell
requests to these two separate EARs, you'll randomly get ClassCastExceptions. This is
due to these two isolated EARs could potentially be using the same
MicroRemoteClientInvoker instance, and hence the same unmarshaller. So, you could easily
get this situation:
1. Invocation for bean A is proxied through isolated EAR-1 in node1. A new client invoker
is created.
2009-05-04 16:31:04,489 31905 DEBUG
[org.jboss.remoting.transport.socket.MicroSocketClientInvoker]
(WorkerThread#0[127.0.0.2:50932]:) SocketClientInvoker[5e5f92, socket://lo3:3873]
constructed
... // new logged line below
server.log:12767:2009-05-04 16:31:04,489 31905 TRACE
[org.jboss.remoting.MicroRemoteClientInvoker] (WorkerThread#0[127.0.0.2:50932]:) New
unmarshaller set to
org.jboss.remoting.marshal.serializable.SerializableUnMarshaller@2606b8 with classloader
org.jboss.remoting.loading.RemotingClassLoader@10f3801
2. Loads Foo (or in this case ResponseMsg from EAR-1):
2009-05-04 16:31:04,534 31950 TRACE
[org.jboss.remoting.loading.ObjectInputStreamWithClassLoader]
(WorkerThread#0[127.0.0.2:50932]:) Calling
Class.forName(classcastexceptiontest.process.ResponseMsg, false,
org.jboss.remoting.loading.RemotingClassLoader@10f3801)
2009-05-04 16:31:04,535 31951 TRACE
[org.jboss.remoting.loading.ObjectInputStreamWithClassLoader]
(WorkerThread#0[127.0.0.2:50932]:) Resolved class
classcastexceptiontest.process.ResponseMsg.ClassLoader=org.jboss.mx.loading.UnifiedClassLoader3@1d4f279{
url=file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/server/290590_1/tmp/deploy/tmp4913079009040294654processinvoker1.ear
,addedOrder=37}
..org.jboss.mx.loading.UnifiedClassLoader3@1d4f279{
url=file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/server/290590_1/tmp/deploy/tmp4913079009040294654processinvoker1.ear
,addedOrder=37}
..org.jboss.mx.loading.HeirarchicalLoaderRepository3$NoParentClassLoader@1178281
..org.jboss.system.server.NoAnnotationURLClassLoader@1e4457d
..sun.misc.Launcher$AppClassLoader@17182c1
....file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/bin/run.jar
....file:/usr/java/jdk1.6.0_12/lib/tools.jar
..sun.misc.Launcher$ExtClassLoader@13f5d07
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/dnsns.jar
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/sunjce_provider.jar
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/localedata.jar
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/sunpkcs11.jar
++++CodeSource:
(file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/server/290590_1/tmp/deploy/tmp4913079009040294654processinvoker1.ear-contents/process-intf.jar
<no signer certificates>)
Implemented Interfaces:
++interface java.io.Serializable
++++ClassLoader: null
++++Null CodeSource
2. Invocation for bean B is proxied through isolated EAR-2 in node1. A cached invoker is
used:
2009-05-04 16:31:04,516 31932 TRACE [org.jboss.remoting.InvokerRegistry]
(WorkerThread#1[127.0.0.2:50931]:) Found and returning cached client invoker
(SocketClientInvoker[5e5f92, socket://lo3:3873])
And the unrmarshaller is already set with the wrong classloader!!:
2009-05-04 16:31:04,516 31932 TRACE [org.jboss.remoting.MicroRemoteClientInvoker]
(WorkerThread#1[127.0.0.2:50931]:) Unmarshaller is already set to
org.jboss.remoting.marshal.serializable.SerializableUnMarshaller@2606b8
3. So, with the wrong classloader, it loads Foo (or ResponseMsg) from EAR-1 again when it
should have loaded it from EAR-2:
2009-05-04 16:31:04,524 31940 TRACE
[org.jboss.remoting.loading.ObjectInputStreamWithClassLoader]
(WorkerThread#1[127.0.0.2:50931]:) Resolved class
classcastexceptiontest.process.ResponseMsg.ClassLoader=org.jboss.mx.loading.UnifiedClassLoader3@1d4f279{
url=file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/server/290590_1/tmp/deploy/tmp4913079009040294654processinvoker1.ear
,addedOrder=37}
..org.jboss.mx.loading.UnifiedClassLoader3@1d4f279{
url=file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/server/290590_1/tmp/deploy/tmp4913079009040294654processinvoker1.ear
,addedOrder=37}
..org.jboss.mx.loading.HeirarchicalLoaderRepository3$NoParentClassLoader@1178281
..org.jboss.system.server.NoAnnotationURLClassLoader@1e4457d
..sun.misc.Launcher$AppClassLoader@17182c1
....file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/bin/run.jar
....file:/usr/java/jdk1.6.0_12/lib/tools.jar
..sun.misc.Launcher$ExtClassLoader@13f5d07
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/dnsns.jar
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/sunjce_provider.jar
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/localedata.jar
....file:/usr/java/jdk1.6.0_12/jre/lib/ext/sunpkcs11.jar
++++CodeSource:
(file:/home/galder/jboss/code/eap/4.3.0.ga.cp04/build/output/jboss-4.3.0.GA_CP04/server/290590_1/tmp/deploy/tmp4913079009040294654processinvoker1.ear-contents/process-intf.jar
<no signer certificates>)
Implemented Interfaces:
++interface java.io.Serializable
++++ClassLoader: null
++++Null CodeSource
4. Result is a CCE:
2009-05-04 16:31:04,525 31941 ERROR
[classcastexceptiontest.processinvoker.ProcessInvoker2] (WorkerThread#1[127.0.0.2:50931]:)
Caught exception
java.lang.ClassCastException: classcastexceptiontest.process.ResponseMsg cannot be cast to
classcastexceptiontest.process.ResponseMsg
at $Proxy74.doProcess(Unknown Source)
at
classcastexceptiontest.processinvoker.ProcessInvoker2.invokeProcess(ProcessInvoker2.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
at
org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
at
org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor.java:63)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.ejb3.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:57)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedEntityManagerInterceptor.java:54)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.ejb3.AllowedOperationsInterceptor.invoke(AllowedOperationsInterceptor.java:47)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.aspects.tx.TxPolicy.invokeInOurTx(TxPolicy.java:79)
at org.jboss.aspects.tx.TxInterceptor$Required.invoke(TxInterceptor.java:191)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.aspects.tx.TxPropagationInterceptor.invoke(TxPropagationInterceptor.java:94)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.ejb3.stateless.StatelessInstanceInterceptor.invoke(StatelessInstanceInterceptor.java:70)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.aspects.security.AuthenticationInterceptor.invoke(AuthenticationInterceptor.java:77)
at
org.jboss.ejb3.security.Ejb3AuthenticationInterceptor.invoke(Ejb3AuthenticationInterceptor.java:108)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at org.jboss.ejb3.ENCPropagationInterceptor.invoke(ENCPropagationInterceptor.java:46)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.ejb3.asynchronous.AsynchronousInterceptor.invoke(AsynchronousInterceptor.java:106)
at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
at
org.jboss.ejb3.stateless.StatelessContainer.dynamicInvoke(StatelessContainer.java:280)
at org.jboss.aop.Dispatcher.invoke(Dispatcher.java:106)
at
org.jboss.aspects.remoting.AOPRemotingInvocationHandler.invoke(AOPRemotingInvocationHandler.java:82)
at org.jboss.remoting.ServerInvoker.invoke(ServerInvoker.java:866)
at
org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:608)
at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:406)
at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:173)
How to resolve this?
At first glance, the most trivial thing to do is to have an unmarshaller that simply uses
whatever Thread.currentThread().getContextClassLoader() is set to, rather than being
caching unmarshaller and classloaders.
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