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Date: Tue, 25 Sep 2007 12:24:04 -0600
From: Filip Hanik - Dev Lists <devlists@hanik.com>
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To: Tomcat Users List <users@tomcat.apache.org>
Subject: Re: DeltaManager cannot receive message through TCP channel in Tomcat
 cluster
References: <46F944B8.3050506@titanemail.com>
In-Reply-To: <46F944B8.3050506@titanemail.com>
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you probably have some rogue java process still running somewhere with 
clustering enabled,

Filip

Daniel M Garland wrote:
> Hi all,
>
> I've been running two Tomcat 5.5.20 servers in a cluster for some time 
> on Mac OSx but we've recently moved to 64-bit architecture (Debian 
> etch) . I tried as far as possible to keep the config the same, so 
> only the OS has changed (and I also got the Apache Portable Runtime 
> going). However since moving to this new setup I'm starting to see the 
> following messages in my catalina.out:
>
> 25-Sep-2007 16:35:11 org.apache.catalina.cluster.session.DeltaManager 
> messageReceived
> SEVERE: Manager []: Unable to receive message through TCP channel
> java.lang.ClassNotFoundException:
> com.mycompany.someSerialiazbleObject
>
> and sometimes in other web apps I see instead of ClassNotFoundException:
>
> java.io.InvalidClassException: 
> org.mycomapny.someOtherSerializableObject; local class incompatible: 
> stream classdesc serialVersionUID = -1393554805485899996, local class 
> serialVersionUID = 8444624889687850885
>
> Now I did some homework here and I've tried the following without 
> success:
>
> 1) I've compiled the java files on the server's themselves, so I am 
> sure that the correct class versions are being used
> 2) The object implements java.io.Serializable, and has a generated 
> serial ID from Eclipse. Incidentally, this Long value matches the 
> local class serialVersionUID, so I have no idea where the 'stream' 
> serialVersionUID comes from.
> 3) I have the same code running on both the Tomcat servers.
>
> What I would like to know is where I am supposed to look next for some 
> answers to this problem. Is there any more information from my config 
> that would be relevant to post here?
>
> Thanks in advance, my first 'tomcat-users' post :)
>
> Dan Garland
> daniel.garland@NO-SPAMtitanemail.com
>
> -- Stack Trace --
> 25-Sep-2007 16:35:11 org.apache.catalina.cluster.session.DeltaManager 
> messageReceived
> SEVERE: Manager []: Unable to receive message through TCP channel
> java.lang.ClassNotFoundException:
> com.mycompany.someSerialiazbleObject
>         at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
>         at java.security.AccessController.doPrivileged(Native Method)
>         at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
>         at java.lang.Class.forName0(Native Method)
>         at java.lang.Class.forName(Class.java:242)
>         at 
> java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:574)
>         at 
> org.apache.catalina.cluster.session.ReplicationStream.resolveClass(ReplicationStream.java:84) 
>
>         at 
> java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1538)
>         at 
> java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1460)
>         at 
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1693)
>         at 
> java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1299)
>         at 
> java.io.ObjectInputStream.readObject(ObjectInputStream.java:339)
>         at 
> org.apache.catalina.cluster.session.DeltaRequest$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.messageReceived(ClusterSessionListener.java:85) 
>
>         at 
> org.apache.catalina.cluster.tcp.SimpleTcpCluster.receive(SimpleTcpCluster.java:1167) 
>
>         at 
> org.apache.catalina.cluster.tcp.ClusterReceiverBase.messageDataReceived(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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