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From "Cris Daniluk" <cris.dani...@gmail.com>
Subject Re: serialization error
Date Fri, 01 Dec 2006 17:06:14 GMT
This is also not during Tomcat startup. Initially I suspected it might
be because the Configuration hadn't been initialized on all of the
nodes, but that doesn't seem to be the case. It's hard to debug on a
cluster :)

Right now I've changed to debug on STABLE-1.2 HEAD. The NPE is on line
1807 there. I'll let you know if I find anything

Cris

On 12/1/06, Andrus Adamchik <andrus@objectstyle.org> wrote:
> Hi Cris,
>
> I am leaving to catch the train now. I'll take a look over the
> weekend. This is strange indeed - we had issues in the past on
> deserialization during Tomcat startup, but those were due to
> ClassLoaders not being in the right state. This scenario is different.
>
> Andrus
>
> On Dec 1, 2006, at 6:48 PM, Cris Daniluk wrote:
>
> > I've turned on Tomcat clustering on an existing application, and thus
> > the session-bound user DataContext is being serialized across the
> > wire. Whenever I connect to a Tomcat node, the nodes that are
> > replicated to report the attached exception. Based on the line number
> > (Cayenne 1.2.1), it looks like the objectStore has null elements in
> > it, which does not make any sense.
> >
> > Any ideas?
> >
> > Cris
> >
> >
> > ERROR [org.apache.catalina.cluster.tcp.TcpReplicationThread[1]] -
> > 2006-12-01 10:44:42,264 Manager [/integration]: Unable to receive
> > message through TCP channel
> > java.lang.NullPointerException
> >        at org.objectstyle.cayenne.access.DataContext.readObject
> > (DataContext.java:1806)
> >        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> >        at sun.reflect.NativeMethodAccessorImpl.invoke
> > (NativeMethodAccessorImpl.java:39)
> >        at sun.reflect.DelegatingMethodAccessorImpl.invoke
> > (DelegatingMethodAccessorImpl.java:25)
> >        at java.lang.reflect.Method.invoke(Method.java:585)
> >        at java.io.ObjectStreamClass.invokeReadObject
> > (ObjectStreamClass.java:946)
> >        at java.io.ObjectInputStream.readSerialData
> > (ObjectInputStream.java:1809)
> >        at java.io.ObjectInputStream.readOrdinaryObject
> > (ObjectInputStream.java:1719)
> >        at java.io.ObjectInputStream.readObject0
> > (ObjectInputStream.java:1305)
> >        at java.io.ObjectInputStream.defaultReadFields
> > (ObjectInputStream.java:1908)
> >        at java.io.ObjectInputStream.readSerialData
> > (ObjectInputStream.java:1832)
> >        at java.io.ObjectInputStream.readOrdinaryObject
> > (ObjectInputStream.java:1719)
> >        at java.io.ObjectInputStream.readObject0
> > (ObjectInputStream.java:1305)
> >        at java.io.ObjectInputStream.defaultReadFields
> > (ObjectInputStream.java:1908)
> >        at java.io.ObjectInputStream.readSerialData
> > (ObjectInputStream.java:1832)
> >        at java.io.ObjectInputStream.readOrdinaryObject
> > (ObjectInputStream.java:1719)
> >        at java.io.ObjectInputStream.readObject0
> > (ObjectInputStream.java:1305)
> >        at java.io.ObjectInputStream.readObject
> > (ObjectInputStream.java:348)
> >        at org.apache.catalina.cluster.session.DeltaRequest
> > $AttributeInfo.readExternal(DeltaRequest.java:334)
> >        at
> > org.apache.catalina.cluster.session.DeltaRequest.readExternal
> > (DeltaRequest.java:246)
> >        at
> > org.apache.catalina.cluster.session.DeltaManager.loadDeltaRequest
> > (DeltaManager.java:697)
> >        at
> > org.apache.catalina.cluster.session.DeltaManager.handleSESSION_DELTA
> > (DeltaManager.java:1572)
> >        at
> > org.apache.catalina.cluster.session.DeltaManager.messageReceived
> > (DeltaManager.java:1522)
> >        at
> > org.apache.catalina.cluster.session.DeltaManager.messageDataReceived
> > (DeltaManager.java:1271)
> >        at
> > org.apache.catalina.cluster.session.ClusterSessionListener.messageRece
> > ived(ClusterSessionListener.java:85)
> >        at org.apache.catalina.cluster.tcp.SimpleTcpCluster.receive
> > (SimpleTcpCluster.java:1167)
> >        at
> > org.apache.catalina.cluster.tcp.ClusterReceiverBase.messageDataReceive
> > d(ClusterReceiverBase.java:426)
> >        at org.apache.catalina.cluster.io.ObjectReader.execute
> > (ObjectReader.java:107)
> >        at
> > org.apache.catalina.cluster.tcp.TcpReplicationThread.drainChannel
> > (TcpReplicationThread.java:138)
> >        at org.apache.catalina.cluster.tcp.TcpReplicationThread.run
> > (TcpReplicationThread.java:69)
> >
>
>

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