Programming for Using JMS Distributed Queues

Hi,
Does anyone know specifically how your meant to write java code in order to fully make use of JMS Distributed queues. At the moment we have a 3rd party app, which I don't think is written correctly, as it always locks up after using a distributed queue, or a consumer is at 0 on one of the members of the distributed queue, when it should always should be constant and uniform.
Its as if their code hasn't been written correctly.

Distributed queue applications are encouraged to leverage WebLogic MDBs, which automatically ensure that consumers are attached to each distributed queue member, and to write applications in a way that has no dependency on which JVM a particular message is processed.
At a guess, the third party product is setting up a consumer on one member of the distributed Q, while messages are being produced to the other member. If this assumption is true, here are some thoughts:
* Consider using a single Q for the third party product's usage instead of a distributed queue. Configuring a distributed queue is not adding any high availability, as the product is expecting all messages to pin to the same Q instance.
* Producers and consumers load-balance independently, but, when "affinity" and "load balance" are both configured to false on a Producer's connection factory, producers will have a tendency to load balance to the member that hosts more than one consumer. This might help somewhat, but my guess is that it won't help in all cases -- for example, after a restart I'm not sure that there's a guarantee that the consumer won't load balance to the "wrong" member (the member that has no messages).
* It might help to enable "queue forwarding" on the distributed queue configuration. This feature automatically forwards messages trapped in a destination that has no consumers to a queue that has consumers. "Queue forwarding" is not compatible with WebLogic's "unit-of-order" feature, but it's likely the third party product isn't using this feature. Queue forwarding also imposes a performance penalty - but whether you notice the difference depends on whether you have high performance requirements.
Hope this helps,
Tom
Edited by: TomB on Mar 9, 2011 6:28 PM

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[email protected]

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Hi,
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</weblogic-jms>
After:
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Update: verified in a 12.1.1.0 (JDK6) cluster - bug does not occur there.
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If I uncheck one of the servers - I work fine - however I would like to target all JMS Servers in the cluster - this used to work fine in 10.3.5.0
Following
http://docs.oracle.com/cd/E24329_01/apirefs.1211/e24401/taskhelp/jms_modules/distributed_queues/CreateUniformDistributedQueues.html
I am able to create a new queue no problem against the multiple-server subdeployment - but when I navigate to the subdeployment dropdown - the target is erased with "None".
If I save the subdeployment after setting it during the queue create - it is erased
<sub-deployment-name>MW-JMS-SubDeployment</sub-deployment-name>
Before:
<weblogic-jms xmlns="http://xmlns.oracle.com/weblogic/weblogic-jms" xmlns:sec="http://xmlns.oracle.com/weblogic/security" xmlns:wls="http://xmlns.oracle.com/weblogic/security/wls" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/weblogic/weblogic-jms http://xmlns.oracle.com/weblogic/weblogic-jms/1.1/weblogic-jms.xsd">
<uniform-distributed-queue name="HousekeeperControlQueue">
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- upon server startup the config is valid - just dont re-save the jms module or the subdeployment target will be erases
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Hi All,
I am trying to run simple program on JMS Queue.
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Getting this error
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Siddhardha.
Code:
package demo;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Properties;
import javax.jms.*;
import javax.naming.*;
import javax.servlet.*;
import javax.servlet.http.*;
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public static void main(String args[])
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QueueSession queueSession;
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* Attached following libraries to the Project
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* optic.jar
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*/

Hi,
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Regards,
Sandeep

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I have Created a cluster MS_01 and MS_02.
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Also have create a distributed queue called DistributedQueue-0 and a distributed connection factory called ConnectionFactory-0.
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thanking you all in advance.
Regards
Girish Subbaramu.

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java:comp/resource/BAMTTT/TopicConnectionFactories/bam_ttq_tab
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■ Durable Subscriber Name. BAMFilteredSubscription
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■ Client ID. ClientID
You can also refer to:
http://www.oracle.com/technology/products/integration/bam/10.1.3/TechNotes/TechNote_BAM_AQ_Configuration.pdf
Regards, Stephen

Programming for Using JMS Distributed Queues

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