in special cases wadi clustering thread fails to load web application classes
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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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