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From "Richard Mixon (qwest)" <rnmi...@qwest.net>
Subject RE: Tomcat clustering and NotSerializableException
Date Tue, 01 Mar 2005 14:45:22 GMT
CoyoteRequestFacade is the first element in the stack trace - it is not
the session stored object that is causing the NotSerializableException.

As I said in my prior posting, to resolve this issue you need to:

1) Identify each object that you are explicitly storing in the session
and make sure it directly or indirectly (through inheritance) specified
that it implements Serializable.

2) Follow the chain from each session object to other objects that it
references and make sure they are ALL marked as serializable (again -
either directly or indirectly)>

That will fix your problem. These issues often do not come up until
either you:
1. Try and use session replication.
2. Try to persist sessions to a datastore and access from a cluster.
3. Try to persist sessions across a restart of Tomcat.

Also, please just reply to the list - not to the list and to the poster.

HTH - Richard

Sng Wee Jim wrote:
> But the stacktrace says
>
> java.io.NotSerializableException:
> org.apache.coyote.tomcat5.CoyoteRequestFacade
> 	at
> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
> 	at
>
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:13
> 32)
> 	at
>
> Since CoyoteRequestFacade is a tomcat class, I assume it has to be
> fixed
> by the tomcat team. Unless the actual object that is not Serializable
> not CoyoteRequestFacade is available somewhere else...
>
> - Jim
>
>
>
> -----Original Message-----
> From: Richard Mixon (qwest) [mailto:rnmixon@qwest.net] Sent: Monday,
> February 28, 2005 11:13 PM
> To: Tomcat Users List
> Subject: RE: Tomcat clustering and NotSerializableException
>
> As Matt said its probably your applications objects. When we switched
> to
> clustering I was surprised at how many of my session objects I needed
> to
> add serializable to. But it was easy work and quickl done.
>
> HTH - Richard
>
> Dale, Matt wrote:
>> I would guess that this means you have an object in your session that
>> does not implement the serializable interface.
>>
>> Ta
>> Matt
>>
>> -----Original Message-----
>> From: Sng Wee Jim [mailto:Wee.Jim.Sng@capco.com]
>> Sent: 28 February 2005 09:21
>> To: tomcat-user@jakarta.apache.org
>> Subject: Tomcat clustering and NotSerializableException
>>
>>
>>
>> Hi,
>>
>>
>>
>>
>>
>> I am using Tomcat 5.0.28 on MS Win2k server.
>>
>>
>>
>>
>> After I have uncommented the "Cluster" element in server.xml, I get
>> the following exceptions on the tomcat console for some actions that
>> are using displaytag.
>>
>>
>>
>>
>> Is it a tomcat bug, since
>> org.apache.coyote.tomcat5.CoyoteRequestFacade
>> is involved?
>>
>>
>>
>>
>>
>>
>>
>>
>> (DeltaManager.java:813)- Unable to serialize delta request
>>
>> java.io.NotSerializableException:
>> org.apache.coyote.tomcat5.CoyoteRequestFacade
>>
>>         at
>> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1054)
>>
>>
>>
>>
>>         at
>> java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java
>>
>>> 1332)
>>
>>         at
>> java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:13
>>
>> 04)
>>
>>         at
>> java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.jav
>>
>> a:1247)
>>
>>         at
>> java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1052)
>>
>>
>>
>>
>>         at
>> java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:278)
>>
>>         at
>> org.apache.catalina.cluster.session.DeltaRequest$AttributeInfo.writeE
>>
>> xternal(DeltaRequest.java:300)
>>
>>         at
>> org.apache.catalina.cluster.session.DeltaRequest.writeExternal(DeltaR
>>
>> equest.java:217)
>>
>>         at
>> org.apache.catalina.cluster.session.DeltaManager.unloadDeltaRequest(D
>>
>> eltaManager.java:393)
>>
>>         at
>> org.apache.catalina.cluster.session.DeltaManager.requestCompleted(Del
>>
>> taManager.java:782)
>>
>>         at
>> org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationVa
>>
>> lve.java:203)
>>
>>         at
>> org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
>>
>> eContext.java:102)
>>
>>         at
>> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
>>
>> ava:118)
>>
>>         at
>> org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
>>
>> eContext.java:102)
>>
>>         at
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
>>
>> a:520)
>>
>>         at
>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
>>
>> ve.java:109)
>>
>>         at
>> org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
>>
>> eContext.java:104)
>>
>>         at
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
>>
>> a:520)
>>
>>         at
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
>>
>>
>>
>>
>>         at
>> org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:16
>>
>> 0)
>>
>>         at
>> org.apache.jk.server.JkCoyoteHandler.invoke(JkCoyoteHandler.java:300)
>>
>>
>>
>>
>>         at
>> org.apache.jk.common.HandlerRequest.invoke(HandlerRequest.java:374)
>>
>>         at
>> org.apache.jk.common.ChannelSocket.invoke(ChannelSocket.java:743)
>>
>>         at
>> org.apache.jk.common.ChannelSocket.processConnection(ChannelSocket.ja
>>
>> va:675)
>>
>>         at
>> org.apache.jk.common.SocketConnection.runIt(ChannelSocket.java:866)
>>
>>         at
>> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
>>
>> ool.java:683)
>>
>>         at java.lang.Thread.run(Thread.java:534)
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> - Jim
>>
>>
>>
>>
>
************************************************************************
>> The information in this email is confidential and is intended solely
>> for the addressee(s). Access to this email by anyone else is
>> unauthorized. If you are not an intended recipient, please notify
>> the sender of this email
>>
>> immediately. You should not copy, use or disseminate the
>>
>> information contained in the email.
>> Any views expressed in this message are those of the individual
>> sender, except where the sender specifically states them to be
>> the views of Capco.
>>
>> http://www.capco.com/
>>
>>
>
************************************************************************
>
>
>
>
************************************************************************
> The information in this email is confidential and is intended solely
> for the addressee(s).
> Access to this email by anyone else is unauthorized. If you are not
> an intended recipient, please notify the sender of this email
> immediately. You should not copy, use or disseminate the information
> contained in the email. Any views expressed in this message are those
> of the individual
> sender, except where the sender specifically states them to be
> the views of Capco.
>
> http://www.capco.com/
>
>
************************************************************************


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