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From "Simon Godik (JIRA)" <j...@apache.org>
Subject [jira] Created: (GERONIMO-5256) in special cases wadi clustering thread fails to load web application classes
Date Fri, 16 Apr 2010 06:33:25 GMT
in special cases wadi clustering thread fails to load web application classes
-----------------------------------------------------------------------------

                 Key: GERONIMO-5256
                 URL: https://issues.apache.org/jira/browse/GERONIMO-5256
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
    Affects Versions: 2.1.4
         Environment: redhat 5.4, suse 11.2
            Reporter: Simon Godik


If object placed in a http session implements java.io.Externalizable and is loading web-app
specific classes from the readExternal() method with the thread context classloader (which
is org.apache.geronimo.configs/wadi-clustering/2.1.4/car classloader) class loading fails.
This happens on the receiving side when session is replicated from the owning cluster member
to the peer cluster member over wadi transport and is consumed by the wadi thread.

This came about because some web frameworks load classes from the readExternal() method with
TC classloader.

I have a fix for this but it is not generic, so I'm not submitting it.

Not sure how to attach files, so code and logs below:

Code and log below.
	public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
		this.state = (String) in.readObject();
		
		try {
			Class<?> clazz = Thread.currentThread().getContextClassLoader().loadClass("org.bpma.cluster.VerySpecial");

			this.verySpecial = (VerySpecial) clazz.newInstance();
			this.verySpecial.setHello("hello, very special!!!");
			
			System.out.println("VERY-SPECIAL LOADED FROM THE TC-CL");
			System.out.flush();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
	}


Caused by: org.codehaus.wadi.core.WADIRuntimeException: java.lang.ClassNotFoundException:
org.bpma.cluster.VerySpecial in classloader org.apache.geronimo.configs/wadi-clustering/2.1.4/car
        at org.codehaus.wadi.replication.manager.basic.SessionStateHandler.resto
reFromFullState(SessionStateHandler.java:78)
        at org.codehaus.wadi.replication.storage.memory.SyncMemoryReplicaStorage
.mergeCreate(SyncMemoryReplicaStorage.java:83)
        ... 20 more
Caused by: java.lang.ClassNotFoundException: org.bpma.cluster.VerySpecial in cla
ssloader org.apache.geronimo.configs/wadi-clustering/2.1.4/car
        at org.apache.geronimo.kernel.config.MultiParentClassLoader.loadOptimize
dClass(MultiParentClassLoader.java:438)
        at org.apache.geronimo.kernel.config.MultiParentClassLoader.loadClass(Mu
ltiParentClassLoader.java:280)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at org.bpma.cluster.TcLoading.readExternal(TcLoading.java:35)
        at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:179
2)
        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
751)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:19
47)
        at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)

        at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1
753)
        at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
        at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
        at org.codehaus.wadi.core.session.DistributableAttributesMemento.readExt
ernal(DistributableAttributesMemento.java:36)
        at org.codehaus.wadi.core.session.DistributableSessionMemento.readExtern
al(DistributableSessionMemento.java:31)
        at org.codehaus.wadi.core.eviction.SimpleEvictable.readExternal(SimpleEv
ictable.java:91)
        at org.codehaus.wadi.core.util.Utils.setContent(Utils.java:78)
        at org.codehaus.wadi.replication.manager.basic.SessionStateHandler.resto
reFromFullState(SessionStateHandler.java:76)
        ... 21 more



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