[jboss-user] [Clustering/JBoss] - In jboss-4.2.3.GA Clusting failure

[javang]

HI, all
        I use jboss-4.2.3.GA Clusting My-application, in the case one Object implements Serializable and the object set in HttpSession(eg.httpSession.setAttribute("hello",object) ), when running the server, fellow trace:
        <log4j:event logger="org.jboss.web.tomcat.service.session.JBossCacheService" timestamp="1226584029953" level="ERROR" thread="ajp-127.0.0.1-8009-2">
<log4j:message><![CDATA[externalizeSession(): exception occurred externalizing session SessionBasedClusteredSession[id: w48muvJV7KDcQiuAtBzuYg**.sa lastAccessedTime: 1226584029921 version: 20 lastOutdated: 0]]]></log4j:message>
<log4j:throwable><![CDATA[java.io.NotSerializableException: org.apache.catalina.session.StandardSessionFacade
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.defaultWriteFields(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at java.util.concurrent.ConcurrentHashMap.writeObject(Unknown Source)
	at sun.reflect.GeneratedMethodAccessor112.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at java.io.ObjectStreamClass.invokeWriteObject(Unknown Source)
	at java.io.ObjectOutputStream.writeSerialData(Unknown Source)
	at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
	at java.io.ObjectOutputStream.writeObject0(Unknown Source)
	at java.io.ObjectOutputStream.writeObject(Unknown Source)
	at org.jboss.web.tomcat.service.session.SessionBasedClusteredSession.writeExternal(SessionBasedClusteredSession.java:175)
	at org.jboss.web.tomcat.service.session.JBossCacheService.externalizeSession(JBossCacheService.java:1033)
	at org.jboss.web.tomcat.service.session.JBossCacheService.putSession(JBossCacheService.java:322)
	at org.jboss.web.tomcat.service.session.JBossCacheClusteredSession.processSessionRepl(JBossCacheClusteredSession.java:123)
	at org.jboss.web.tomcat.service.session.JBossCacheManager.processSessionRepl(JBossCacheManager.java:1127)
	at org.jboss.web.tomcat.service.session.JBossCacheManager.storeSession(JBossCacheManager.java:682)
	at org.jboss.web.tomcat.service.session.InstantSnapshotManager.snapshot(InstantSnapshotManager.java:49)
	at org.jboss.web.tomcat.service.session.ClusteredSessionValve.invoke(ClusteredSessionValve.java:108)
	at org.jboss.web.tomcat.service.session.JvmRouteValve.invoke(JvmRouteValve.java:84)
	at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:157)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:262)
	at org.apache.coyote.ajp.AjpProcessor.process(AjpProcessor.java:437)
	at org.apache.coyote.ajp.AjpProtocol$AjpConnectionHandler.process(AjpProtocol.java:366)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:446)
	at java.lang.Thread.run(Unknown Source)
]]></log4j:throwable>
</log4j:event>
      Need help!
      thks

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