JMS subscriber is triggered twice for a single message.

I have a JMS distributed topic created on a cluster (WLI sp4). When a message is published to the topic, the subscriber (JPD) is triggered twice. Two instances of the same JPD are triggered and they run parallely. I have two managed servers associated with the cluster.
Can any of you help me know why this is happening? Is this a known issue in sp4?
Will really appreciate if you help me out of this.
Edited by elangosv at 12/11/2006 1:07 PM

No, this is a correct behaviour of WL distributed topics (DT). When you
publish message into DT it'll be replicated to all physical members of the
DT. JMS Event Generator (EG) which will trigger the jpd is just an MDB,
subscribed on DT (on its local physical member). I assume you have two JMS
servers deployed on each managed node and your EG and JPD are deployed to
the cluster (on both managed nodes) as well. Thus, and MDB (EG) on each node
will receive a message replica delivered to the local DT member and will
start a JPD.
In order to solve the issue you may use non-distributed topics instead: you
may specify topics with the same Name and JNDIName on both your JMS servers
but its JNDI anme must be not replicated through the cluster:
JNDINameReplicated="false". Your JMS servers must also not use migratable
targets in this case.
Another possible solution (that I use for some reason): to add into the
message a JMS property identifying the source of the message, i.e. the
server (managed node) name. EG on each node has a JMS selector which
specifies that it'll filter out messages produced on other members of the
DT. (jms_Source = '<your node name here>').
HTH, Denis.
<Elango SV> wrote in message news:[email protected]..
I have a JMS distributed topic created on a cluster (WLI sp4). When a
message is published to the topic, the subscriber (JPD) is triggered twice.
Two instances of the same JPD are triggered and they run parallely. I have
two managed servers associated with the cluster.
Can any of you help me know why this is happening? Is this a known issue in
sp4?
Will really appreciate if you help me out of this.
Edited by elangosv at 12/11/2006 1:07 PM

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JMS subscriber is triggered twice for a single message.

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