Troubleshooting
Problem
You notice NullPointerExceptions after upgrading WebSphere® Application Server after startup. You have a clustered environment where only some of the servers have been upgraded.
Symptom
After starting the WebSphere Application Server, you might see a similar message in the SystemOut.log file:
[1/1/09 1:08:03:274 EST] 0000000a WsServerImpl A WSVR0001I: Server server1 open for e-business [1/1/09 1:08:03:304 EST] 00000019 SystemOut O Caused by: java.lang.NullPointerException at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1845) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1744) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1330) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:364) at com.ibm.ws.wsgroup.bb.BBPostingMsg.readExternal(BBPostingMsg.java:213) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1780) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1742) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1330) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:364) at com.ibm.ws.wsgroup.WsGroupUtil.byteArrayToObject(WsGroupUtil.java:113) at com.ibm.ws.wsgroup.bb.CoreGroup$BroadcastTopic.handleMessage(CoreGroup.java:252) at com.ibm.ws.wsgroup.bb.CoreGroup$BroadcastTopic.postingAdded(CoreGroup.java:235) at com.ibm.ws.wsgroup.bb.BBTopic.updated(BBTopic.java:157) at com.ibm.ws.hamanager.bboard.LocalBulletinBoardStateManager$ BBoardUserCallback.doCallback(LocalBulletinBoardStateManager.java:2784) at com.ibm.ws.hamanager.impl.Worker.run(UserCallbacks.java:288) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473) |
Cause
This is due to having a clustered environment where you have upgraded only one of the WebSphere Application Server installations, but not the others. The Core Group method calls also contain a version identifier, which may report different versions if upgrades are not applied to all the servers.
Resolving The Problem
Apply the upgrades on all systems so they are at the same version level. For more information concerning Core Groups, HAManager and related communications, see the following links:
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Document Information
Modified date:
15 June 2018
UID
swg21368046