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POHow to limit the number of MDB instances listening to a Jboss JMS queue
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  1. POHow to limit the number of MDB instances listening to a Jboss JMS queue
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    copied!<p>I'm having a problem with the following setup:</p> <p>A Java application send email msg to a JMS queue, then an MDB listening to the queue get the email msg with the onMessage method, it open a connection on the Gmail SMTP, send the email to the SMTP and close the connection. Doing this on all message in the JMS queue.</p> <p>It is working great when I have up to 5 messages in the queue at the same time. All messages are picked-up in the same time by 5 different instances of the MDB, so I have 5 concurrent connection to the Gmail SMTP server. But when there is more messages in the JMS queue, I get a connection error from the Gmail SMTP server. The 5 first messages are sent correctly, but not the rest of the bunch, so the other messages are lost because they are not in the queue anymore.</p> <p>So my question is, is it possible to limit the number of MDB instance that will listen to the JMS queue? If I have a maximum of 5 MDB, then even if I have 1000 messages in the queue, it will just take longer to empty the queue, but at least I wont lose any message.</p> <p>Any other suggestion to resolve this issue would be very much appreciated.</p> <p>Here is the Jboss version:</p> <blockquote> <p>[Server] Release ID: JBoss [Trinity] 4.2.3.GA (build: SVNTag=JBoss_4_2_3_GA date=200807181417)</p> </blockquote> <p>and the config of the MDB is as following : </p> <pre><code>@MessageDriven(activationConfig = { @ActivationConfigProperty( propertyName = "destinationType", propertyValue = "javax.jms.Queue" ), @ActivationConfigProperty( propertyName = "destination", propertyValue = "queue/emailQueue") }) </code></pre> <p>Do you need more?</p> <p>Thanks</p> <p>EDIT 2011-02-14<br> Maybe I'm all wrong wanting to limit the number of MDB instance. I saw a config about the number of JMS threads. If I limit the number of thread that will post to the MDB, maybe it will resolve my issue? Will the JMS wait until a MDB is available before posting msg again? Is there any side effect to do that? Your though please. Thanks<br> END EDIT</p>
 

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