Session Management in Websphere 3.5

[Smruti Mohapatra]

Hello,
I have WAS 3.5 on AIX.
I am getting the following error on my logs.
Can anyone help ?
Exception occurred
Session Object Internals:
id : ZVM4R4A415K1JGZDZUZ13UQ
hashCode : 1735145819
create time : Mon Feb 24 00:40:25 MST 2003
last access : Mon Feb 24 00:49:36 MST 2003
max inactive interval : 28800
user name : anonymous
valid session : true
new session : false
session active : true
overflowed : false
session application parameters : com.ibm.servlet.personalization.sessiontracking.SessionApplicationParameters@236c394a
session tracking epm app data : com.ibm.servlet.personalization.sessiontracking.SessionTrackingEPMApplicationData@3f97b94a
enable epm : true
non-serializable app specific session data : {}
serializable app specific session data : {currentOrg=pcs.data.OrgData@4c00b95b, currentUser=pcs.data.AppUser@7ffdb95b, OrderDisplayBean=pcs.beans.emea.OrderDisp
layBean@9f44b95b, Logon=pcs.beans.emea.LoginBean@79ee395b, OrderDisplay=pcs.beans.emea.OrderDisplayBean@74ab395b}

app data changes : {Thread[Worker#103,5,Servlet Request Worker Threads]={OrderDisplayBean=pcs.beans.emea.OrderDisplayBean@9f44b95b}}
app data removals : null
user write hit : false
max inact write hit : false
listener count hit : false
update : update sessions set
listener count : 0
buflen : 0
cached : true
cacheId : 0005
cacheIdUpdated : false
syncFromServlet : false
lockId : null
app namepcs61EMEAWebAppClone
java.io.UTFDataFormatException at java.io.DataOutputStream.writeUTF(DataOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeUTF(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputString(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.checkSubstitutableSpecialClasses(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java(Compiled Code))
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java(Compiled Code))
at com.ibm.servlet.personalization.sessiontracking.BackedHashtableMR.handlePropertyHits(BackedHashtableMR.java(Compiled Code))
at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.ejbStore(BackedHashtable.java(Compiled Code))
at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.storeSession(BackedHashtable.java(Compiled Code))
at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.put(BackedHashtable.java(Compiled Code))
at com.ibm.servlet.personalization.sessiontracking.DatabaseSessionContext.sync(DatabaseSessionContext.java(Compiled Code))
at com.ibm.servlet.personalization.sessiontracking.SessionData.releaseSession(SessionData.java(Compiled Code))
at com.ibm.servlet.engine.srt.SRTSessionAPISupport.finish(SRTSessionAPISupport.java(Compiled Code))
at com.ibm.servlet.engine.srt.SRTConnectionContext.finishConnection(SRTConnectionContext.java(Compiled Code))
at com.ibm.servlet.engine.srt.WebAppInvoker.doForward(WebAppInvoker.java(Compiled Code))
at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java(Compiled Code))
at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java(Compiled Code))
at com.ibm.servlet.engine.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java(Compiled Code))
at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java(Compiled Code))
at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java(Compiled Code))
at com.ibm.servlet.engine.oselistener.SQEventListenerImp$ServiceRunnable.run(SQEventListenerImp.java(Compiled Code))
at com.ibm.servlet.engine.oselistener.SQEventListenerImp.notifySQEvent(SQEventListenerImp.java(Compiled Code))
at com.ibm.servlet.engine.oselistener.serverqueue.SQEventSource.notifyEvent(SQEventSource.java(Compiled Code))
at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.notifyService(SQWrapperEventSource.java(Compiled Code))
at com.ibm.servlet.engine.oselistener.serverqueue.SQWrapperEventSource$SelectRunnable.run(SQWrapperEventSource.java:221)
at com.ibm.servlet.engine.oselistener.outofproc.OutOfProcThread$CtlRunnable.run(OutOfProcThread.java:248)
at java.lang.Thread.run(Thread.java:481)
Thanks in advance !!!
Smruti..

[Kyle Brown]

My first guess is that you're trying to write something non-serializable (like an EJB reference maybe?) into the Session.
Kyle

[Smruti Mohapatra]

Well as you have made an assumption, I would like to give you a scenario.
Say I am using a class B which is derived from A. Now A is implementing java.io.serializable interface. But B does not. Does that make B Non-serializable ?

[Kyle Brown]

No, B would be Serializable as it still implements the interface (through inheriting it).
Kyle