https://issues.apache.org/bugzilla/show_bug.cgi?id=51306
Bug #: 51306
Summary: NPE in
DeltaRequest.writeExternal(DeltaRequest.java:267) when
handling remote session expiration
Product: Tomcat 6
Version: 6.0.32
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Cluster
AssignedTo: dev@tomcat.apache.org
ReportedBy: mikhailov.dmi...@gmail.com
Classification: Unclassified
Occasionally we got errors like following:
======
2011-05-30 03:40:17,697 ERROR [pool-1-thread-2]
(org.apache.catalina.ha.session.DeltaManager) Manager [localhost#]: Unable to
receive message through TCP channel
java.lang.NullPointerException
at
java.io.ObjectOutputStream$BlockDataOutputStream.getUTFLength(ObjectOutputStream.java:2106)
at
java.io.ObjectOutputStream$BlockDataOutputStream.writeUTF(ObjectOutputStream.java:1977)
at java.io.ObjectOutputStream.writeUTF(ObjectOutputStream.java:849)
at
org.apache.catalina.ha.session.DeltaRequest.writeExternal(DeltaRequest.java:267)
at org.apache.catalina.ha.session.DeltaRequest.serialize(DeltaRequest.java:287)
at
org.apache.catalina.ha.session.DeltaManager.serializeDeltaRequest(DeltaManager.java:716)
at
org.apache.catalina.ha.session.DeltaManager.requestCompleted(DeltaManager.java:1224)
at org.apache.catalina.ha.session.DeltaSession.expire(DeltaSession.java:403)
at
org.apache.catalina.ha.session.DeltaManager.handleSESSION_EXPIRED(DeltaManager.java:1546)
at
org.apache.catalina.ha.session.DeltaManager.messageReceived(DeltaManager.java:1452)
at
org.apache.catalina.ha.session.DeltaManager.messageDataReceived(DeltaManager.java:1173)
at
org.apache.catalina.ha.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:92)
at
org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:901)
at
org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:882)
at
org.apache.catalina.tribes.group.GroupChannel.messageReceived(GroupChannel.java:269)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
at
org.apache.catalina.tribes.group.interceptors.TcpFailureDetector.messageReceived(TcpFailureDetector.java:110)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
at
org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:79)
at
org.apache.catalina.tribes.group.ChannelCoordinator.messageReceived(ChannelCoordinator.java:241)
at
org.apache.catalina.tribes.transport.ReceiverBase.messageDataReceived(ReceiverBase.java:225)
at
org.apache.catalina.tribes.transport.nio.NioReplicationTask.drainChannel(NioReplicationTask.java:188)
at
org.apache.catalina.tribes.transport.nio.NioReplicationTask.run(NioReplicationTask.java:91)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
It looks like the functionality of Tomcat is not affected by this.
The NPE comes from trying to write null sessionId, but why does Tomcat try to
send something from handling received authoritative SESSION_EXPIRED message?
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