Error writing from flushModified

Friends,
Lately I am seeing this exception so often on my server. We are using BMP for
our entity beans. WL is 8.1Sp2.
I would much appreciate if any one can share his/her opinion/solution for the
issue.
Regards,
-Janiz
EJB Exception: ; nested exception is:
javax.ejb.TransactionRolledbackLocalException: Error writing from flushModified:
weblogic.ejb20.InternalException: Error writing from flushModified
     at weblogic.ejb20.manager.BeanManagedPersistenceManager.scalarFinder(BeanManagedPersistenceManager.java:77)
     at weblogic.ejb20.manager.BaseEntityManager.scalarFinder(BaseEntityManager.java:1580)
     at weblogic.ejb20.manager.BaseEntityManager.localScalarFinder(BaseEntityManager.java:1524)
     at weblogic.ejb20.internal.EntityEJBLocalHome.finder(EntityEJBLocalHome.java:463)
     at com.abc.ejb.Profile_pxe7qb_LocalHomeImpl.findByUserId(Profile_pxe7qb_LocalHomeImpl.java:122)
     at com.abc.ejb.MyEJB.getContactInfo(Unknown Source)
     at com.abc.ejb.MyEJB.getUser(Unknown Source)
     at com.abc.ejb.CustomerFacade_u478p9_EOImpl.getUser(CustomerFacade_u478p9_EOImpl.java:812)
     at com.abc.ejb.CustomerFacade_u478p9_EOImpl_WLSkel.invoke(Unknown Source)
     at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:477)
     at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerRef.java:108)
     at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:420)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:353)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:144)
     at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.java:415)
     at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest.java:30)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:197)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)

My experience with this exception is that, the ejbStore() runs sql update statement unnecessarily and that cause very high chance of deadlocking on a given db table or db row. In the Oracle db, it actually dump 2 trace files and the datetime is very close to the weblogic server log exception (if both servers got the time sync-ed).
We can simply run the ejbsession method involved with the same value in a finite tight loop(100 loops?) from 2~3 jsp pages submissions, we should be able to reproduce the problem easily.
The solution would be using lazy update inside relevant BMP ejbbeans' ejbStore(). This means using a boolean variable to keep track bean fields changed. if nothing changed, the flag will make ejbStore() running like noop, for eg,
if(!isDirty) return;
so far, this solution works well and greatly reduce the chances of running unnecessarily sql update inside ejbStore().
To Oracle, any deadlock will cause 1 of the db connection corrupted or closed silently. This seems not able to be detected by testOnReserve on jdbc connection pool.
Hope this help. Also hope more detailed reply can clarify doubts.
My weblogic is version 8.1SP2 and Oracle 9.2.

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=====
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=====
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Stack Trace lools like this below:
30328 [Thread-5] ERROR pl.computerland.snu.repo.remote.external.RemoteRepoFactoryWrapper - operation():
pl.computerland.snu.repo.remote.RemoteRepoException: java.rmi.RemoteException: SOAP Fault:javax.xml.rpc.soap.SOAPFaultException: EJB Exception: ; nested exception is:
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<detail>
EJB Exception: ; nested exception is:
     javax.ejb.TransactionRolledbackLocalException: Exception during remove.; nested exception is: javax.ejb.EJBException: nested exception is: java.lang.Exception: SQLException on insert: java.sql.SQLException: Transaction BEA1-00042F6B457BAFFD2C3E not active anymore. tx status = Marked rollback. [Reason=weblogic.transaction.internal.AppSetRollbackOnlyException] </detail>; nested exception is:
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     javax.ejb.TransactionRolledbackLocalException: Exception during remove.; nested exception is: javax.ejb.EJBException: nested exception is: java.lang.Exception: SQLException on insert: java.sql.SQLException: Transaction BEA1-00042F6B457BAFFD2C3E not active anymore. tx status = Marked rollback. [Reason=weblogic.transaction.internal.AppSetRollbackOnlyException]
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<detail>
EJB Exception: ; nested exception is:
     javax.ejb.TransactionRolledbackLocalException: Exception during remove.; nested exception is: javax.ejb.EJBException: nested exception is: java.lang.Exception: SQLException on insert: java.sql.SQLException: Transaction BEA1-00042F6B457BAFFD2C3E not active anymore. tx status = Marked rollback. [Reason=weblogic.transaction.internal.AppSetRollbackOnlyException] </detail>; nested exception is:
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