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From: LERBSCHER Jean-Pierre <jean-pierre.lerbscher@cofiroute.fr>
To: "'Tomcat Users List'" <tomcat-user@jakarta.apache.org>
Subject: RE : Problem clustering tomcat when a failed server is restarting
Date: Wed, 17 Nov 2004 18:55:13 +0100
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We are using Tomcat 5.0.27.

-----Message d'origine-----
De=A0: Filip Hanik - Dev [mailto:devlists@hanik.com]=20
Envoy=E9=A0: mercredi 17 novembre 2004 18:27
=C0=A0: Tomcat Users List
Objet=A0: Re: Problem clustering tomcat when a failed server is =
restarting

What version of tomcat?

It fails when it tries to write the principal information to the =
stream.
Since I don't know what version of tomcat you are using, I can't tell =
you
exactly what went wrong.

maybe something in the principal returns null

Filip


----- Original Message -----=20
From: "LERBSCHER Jean-Pierre" <jean-pierre.lerbscher@cofiroute.fr>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>
Sent: Wednesday, November 17, 2004 4:41 AM
Subject: Problem clustering tomcat when a failed server is restarting


We have a cluster Tomcat composed of two servers (default configuration =
of
the cluster is used).

When the first server is stopped, the cluster continues to work fine
(requests are handled by the server that is running).

But when the stopped server is restarting we can see these exceptions.

=20

Could you comment this log and explain us what is wrong. Thanks.

=20

The server that handle the requests log this exception

Server 02

   10 nov. 2004 17:13:54 =
org.apache.catalina.cluster.tcp.SimpleTcpCluster
memberAdded

INFO: Replication member
added:org.apache.catalina.cluster.mcast.McastMember[tcp://w.x.y.z:41001,=
w.x.
y.z,41001, alive=3D35]

10 nov. 2004 17:13:54 org.apache.catalina.cluster.session.DeltaManager
messageReceived

GRAVE: Unable to receive message through TCP channel

java.lang.NullPointerException

        at
java.io.ObjectOutputStream$BlockDataOutputStream.getUTFLength(ObjectOutp=
utSt
ream.java:1898)

        at
java.io.ObjectOutputStream$BlockDataOutputStream.writeUTF(ObjectOutputSt=
ream
.java:1769)

        at =
java.io.ObjectOutputStream.writeUTF(ObjectOutputStream.java:787)

        at
org.apache.catalina.cluster.session.SerializablePrincipal.writePrincipal=
(Ser
ializablePrincipal.java:180)

        at
org.apache.catalina.cluster.session.DeltaSession.writeObject(DeltaSessio=
n.ja
va:1457)

        at
org.apache.catalina.cluster.session.DeltaSession.writeObjectData(DeltaSe=
ssio
n.java:930)

        at
org.apache.catalina.cluster.session.DeltaManager.doUnload(DeltaManager.j=
ava:
539)

        at
org.apache.catalina.cluster.session.DeltaManager.messageReceived(DeltaMa=
nage
r.java:854)

        at
org.apache.catalina.cluster.session.DeltaManager.messageDataReceived(Del=
taMa
nager.java:762)

        at
org.apache.catalina.cluster.tcp.SimpleTcpCluster.messageDataReceived(Sim=
pleT
cpCluster.java:576)

        at
org.apache.catalina.cluster.io.ObjectReader.execute(ObjectReader.java:70=
)

        at
org.apache.catalina.cluster.tcp.TcpReplicationThread.drainChannel(TcpRep=
lica
tionThread.java:129)

        at
org.apache.catalina.cluster.tcp.TcpReplicationThread.run(TcpReplicationT=
hrea
d.java:67)

=20

In the same time the server restarting logs this information.

server 01

Creating ClusterManager for context /myapp using class
org.apache.catalina.cluster.session.DeltaManager

10 nov. 2004 17:13:54 org.apache.catalina.cluster.session.DeltaManager =
start

INFO: Starting clustering manager...:/myapp

10 nov. 2004 17:13:54 org.apache.catalina.cluster.session.DeltaManager =
start

ATTENTION: Manager[/myapp], requesting session state from
org.apache.catalina.cluster.mcast.McastMember[tcp://w.x.y.z:42001,w.x.y.=
z,42
001, alive=3D111640]. This operation will timeout if no session state =
has been
received within 60 seconds

=20

=20

After a delay, server 01 logs this information.

10 nov. 2004 17:14:54 org.apache.catalina.cluster.session.DeltaManager =
start

GRAVE: Manager[/myapp], No session state received, timing out.

10 nov. 2004 17:14:54 org.apache.catalina.core.StandardHostDeployer =
install

INFO: Installation d'une application pour le chemin de contexte  depuis
l'URL file:/opt/tomcat-tst01/webapps/ROOT

...

INFO: Server startup in 62980 ms

=20

server 01 handle the application requests, new session is created.

=20

=20

=20

=20

=20


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