Websphere session persistence gets "protocol violation" using oracle jdbc driver

Hi,

We use oracle (8.1.7) as the session persistence database for our websphere 3.5.4 application server. After 15 min of running a stress test, we get the foll. exception. Any idea whats going wrong?

thanks,

Chinmay

                                 java.sql.SQLException: Protocol
violation
	at java.lang.Throwable.fillInStackTrace(Native Method)
	at java.lang.Throwable.<init>(Throwable.java:94)
	at java.lang.Exception.<init>(Exception.java:42)
	at java.sql.SQLException.<init>(SQLException.java:43)
	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:114)
	at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:156)
	at oracle.jdbc.dbaccess.DBError.check_error(DBError.java:803)
	at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:549)
	at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1311)
	at oracle.jdbc.ttc7.TTC7Protocol.executeFetch(TTC7Protocol.java:661)
	at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:1320)
	at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1232)
	at oracle.jdbc.driver.OracleStatement.doExecuteWithBatch(OracleStatement.java:1353)
	at oracle.jdbc.driver.OracleStatement.doExecute(OracleStatement.java:1760)
	at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1805)
	at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:320)
	at com.ibm.ejs.cm.cache.CachedStatement.executeUpdate(CachedStatement.java:314)
	at com.ibm.ejs.cm.proxy.PreparedStatementProxy.executeUpdate(PreparedStatementProxy.java:235)
	at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.ejbStore(BackedHashtable.java:2564)
	at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.storeSession(BackedHashtable.java:2272)
	at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.put(BackedHashtable.java:2958)
	at com.ibm.servlet.personalization.sessiontracking.DatabaseSessionContext.sync(DatabaseSessionContext.java:112)
	at com.ibm.servlet.personalization.sessiontracking.SessionData.releaseSession(SessionData.java:260)
	at com.ibm.servlet.engine.srt.SRTSessionAPISupport.finish(SRTSessionAPISupport.java:190)
	at com.ibm.servlet.engine.srt.SRTConnectionContext.finishConnection(SRTConnectionContext.java:103)
	at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:102)
	at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67)
	at com.ibm.servlet.engine.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:106)
	at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:160)
	at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:300)

We also get another exception below the above one in the trace log:

StatementProx E Exception closing statement                                 

com.ibm.ejs.cm.exception.IllegalConnectionUseException: Error: Connection is being used in a way that violates the architecture

	at java.lang.Throwable.fillInStackTrace(Native Method)
	at java.lang.Throwable.<init>(Throwable.java:94)
	at java.lang.Exception.<init>(Exception.java:42)
	at java.sql.SQLException.<init>(SQLException.java:82)
	at com.ibm.ejs.cm.portability.PortableSQLException.<init>(PortableSQLException.java:35)
	at com.ibm.ejs.cm.exception.IllegalConnectionUseException.<init>(IllegalConnectionUseException.java:26)
	at com.ibm.ejs.cm.proxy.Proxy.close(Proxy.java:154)
	at com.ibm.ejs.cm.proxy.StatementProxy.__close(StatementProxy.java:61)
	at com.ibm.ejs.cm.proxy.StatementProxy.close(StatementProxy.java:216)
	at com.ibm.ejs.cm.proxy.Proxy.close(Proxy.java:76)
	at com.ibm.ejs.cm.proxy.ConnectionProxy.close(ConnectionProxy.java:645)
	at com.ibm.ejs.cm.proxy.ConnectionProxy.connectionDestroyed(ConnectionProxy.java:97)
	at com.ibm.ejs.cm.pool.ConnectO.fireConnectionDestroyed(ConnectO.java:1500)
	at com.ibm.ejs.cm.pool.ConnectO.destroy(ConnectO.java:741)
	at com.ibm.ejs.cm.pool.ConnectO.translateException(ConnectO.java:1134)
	at com.ibm.ejs.cm.proxy.ConnectionProxy.translateException(ConnectionProxy.java:177)
	at com.ibm.ejs.cm.proxy.PreparedStatementProxy.translateException(PreparedStatementProxy.java:484)
	at com.ibm.ejs.cm.proxy.PreparedStatementProxy.executeUpdate(PreparedStatementProxy.java:238)
	at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.ejbStore(BackedHashtable.java:2564)
	at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.storeSession(BackedHashtable.java:2272)
	at com.ibm.servlet.personalization.sessiontracking.BackedHashtable.put(BackedHashtable.java:2958)
	at com.ibm.servlet.personalization.sessiontracking.DatabaseSessionContext.sync(DatabaseSessionContext.java:112)
	at com.ibm.servlet.personalization.sessiontracking.SessionData.releaseSession(SessionData.java:260)
	at com.ibm.servlet.engine.srt.SRTSessionAPISupport.finish(SRTSessionAPISupport.java:190)
	at com.ibm.servlet.engine.srt.SRTConnectionContext.finishConnection(SRTConnectionContext.java:103)
	at com.ibm.servlet.engine.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:102)
	at com.ibm.servlet.engine.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:67)
	at com.ibm.servlet.engine.invocation.CacheableInvocationContext.invoke(CacheableInvocationContext.java:106)
	at com.ibm.servlet.engine.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:160)
	at com.ibm.servlet.engine.oselistener.OSEListenerDispatcher.service(OSEListener.java:300)