Bugs item #696381, was opened at 2003-03-03 06:59
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Category: JBossWeb
Group: v3.2
>Status: Open
Resolution: Fixed
Priority: 5
Submitted By: Scott M Stark (starksm)
Assigned to: Jules Gosnell (jules_gosnell)
Summary: JGStore not setup to use correct class loader
Initial Comment:
When a value is placed into the http session that
corresponds to a class only available in the war, the
following CNFE exception occurs:
20:35:14,653 ERROR [JGStore] could not demarshal
incoming update
java.lang.ClassNotFoundException: No ClassLoaders found
for: org.jboss.chap9.ex1.SessionValue
at
org.jboss.mx.loading.LoadMgr.beginLoadTask(LoadMgr.java:155)
at
org.jboss.mx.loading.UnifiedClassLoader3.loadClass(UnifiedClassLoader3.java:161)
at
java.lang.ClassLoader.loadClass(ClassLoader.java:255)
at
java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:217)
at
org.mortbay.j2ee.session.MarshallingInterceptor$ObjectInputStream.resolveClass(MarshallingInterceptor.java:70)
at
java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1513)
at
java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at
java.io.ObjectInputStream.readArray(ObjectInputStream.java:1603)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1271)
at
java.io.ObjectInputStream.readArray(ObjectInputStream.java:1603)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1271)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at
org.javagroups.blocks.MethodCall.readExternal(MethodCall.java:432)
at
java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1686)
at
java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1644)
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
at
org.mortbay.j2ee.session.MarshallingInterceptor.demarshal(MarshallingInterceptor.java:108)
at
org.mortbay.j2ee.session.JGStore$1.objectFromByteBuffer(JGStore.java:166)
at
org.javagroups.blocks.RpcDispatcher.handle(RpcDispatcher.java:249)
at
org.javagroups.blocks.RequestCorrelator.handleRequest(RequestCorrelator.java:531)
at
org.javagroups.blocks.RequestCorrelator.access$100(RequestCorrelator.java:37)
at
org.javagroups.blocks.RequestCorrelator$Request.run(RequestCorrelator.java:747)
at
org.javagroups.util.ReusableThread.run(ReusableThread.java:208)
at java.lang.Thread.run(Thread.java:536)
This is due to the wrong class loader being used by the
store. The web application context class loader needs
to be used. I have put a fix into the 3.2 branch for
this, but this only works if the store is an instance
of AbstractReplicatedStore since the Store interface
does not support setLoader. Look at the following code
block in the Jetty class to see how this should be
generatlized to all Stores.
Line 334 of org.jboss.jetty.Jetty.java:
// The web context class loader is needed for
loading the war state objects
Manager mgr =
app.getDistributableSessionManager();
Store store = mgr.getStore();
if( store instanceof AbstractReplicatedStore )
{
AbstractReplicatedStore ars =
(AbstractReplicatedStore) store;
ars.setLoader(app.getClassLoader());
}
----------------------------------------------------------------------
>Comment By: Jules Gosnell (jules_gosnell)
Date: 2003-03-05 10:10
Message:
Logged In: YES
user_id=49106
I've taken your patch as the basis for a fix that I put into
3.0 and 3.2 last night.
I shall be doing some refactoring on the Store classes as
soon as I have the time. I shall probably move the
ClassLoader attribute up the class hierarchy then, so that
is available to other stores.
I'll leave closing the bug to you, if you are happy with the
solution.
Cheers,
Jules
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