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From Jury Levykin <altc...@list.ru>
Subject Replication problem
Date Wed, 01 Dec 2004 10:40:09 GMT
I use tomcat 5.0.27 at SLES 8.1
Tomcat instances installed to two host and join to cluster.

Session replication good working after server startup,
but after 2 - 3 days I get problem with tomcat.

In catalina.out have following lines:
---------------------------------------
Nov 30, 2004 6:34:59 PM org.apache.catalina.cluster.tcp.SimpleTcpCluster memberAdded
INFO: Replication member added:org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.1.2:4001,192.
168.1.2,4001, alive=628535]
Nov 30, 2004 6:35:11 PM org.apache.catalina.cluster.tcp.SimpleTcpCluster memberDisappeared
INFO: Received member disappeared:org.apache.catalina.cluster.mcast.McastMember[tcp://192.168.1.2:4001,1
92.168.1.2,4001, alive=637441]
---------------------------------------------------------------------

These lines writeing into endless loop
and second server will be crash via some time.

In catalina.out write following lines:
----------------------
Nov 30, 2004 3:32:20 PM org.apache.catalina.cluster.tcp.ReplicationValve invoke
SEVERE: Unable to perform replication request.
java.lang.NullPointerException
        at org.apache.catalina.cluster.session.DeltaRequest.writeExternal(DeltaRequest.java:217)
        at org.apache.catalina.cluster.session.DeltaManager.unloadDeltaRequest(DeltaManager.java:393)
        at org.apache.catalina.cluster.session.DeltaManager.requestCompleted(DeltaManager.java:782)
        at org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:203)
        at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
 . . .

--------------------------------------

or following:
--------------------------------------
Nov 30, 2004 2:33:04 PM org.apache.catalina.cluster.tcp.ReplicationValve invoke
SEVERE: Unable to perform replication request.
java.util.NoSuchElementException
        at java.util.LinkedList.remove(LinkedList.java:579)
        at java.util.LinkedList.removeFirst(LinkedList.java:131)
        at org.apache.catalina.cluster.session.DeltaRequest.reset(DeltaRequest.java:153)
        at org.apache.catalina.cluster.session.DeltaSession.resetDeltaRequest(DeltaSession.java:938)
        at org.apache.catalina.cluster.session.DeltaManager.requestCompleted(DeltaManager.java:786)
        at org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:203)
 . . . 
--------------------------------------------------------------------------

What is may fix it problem?

Thanks.


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