JMX meets the DefaultMessageListenerContainer

(It’s kind of like King Kong vs. Godzilla, only more peaceful)

According to the Javadoc, these properties on the DefaultMessageListenerContainer “can be modified at runtime, for example through JMX” :

concurrentConsumers
maxConcurrentConsumers
maxMessagesPerTask
idleTaskExecutionLimit

Armed with this and my handy Spring manual, I added the following to my beans file:

    <bean id="exporter" class="org.springframework.jmx.export.MBeanExporter" lazy-init="false">
<property name="beans">
            <map>
                <entry key="bean:name=listenerContainer1" value-ref="listenerContainer" />
            </map>
        </property>
    </bean>

(In this beans file I already had a DefaultMessageListenerContainer bean with an id of listenerContainer.)

Now when I fired up my JBoss JMX Management, a new bean category appears:

I can click on that link and see several properties that I can change on the DefaultMessageListenerContainer bean, including ConcurrentConsumers, which is currently 1.  If I change that to 2 and press the Apply Changes button though, I get a stack trace in JBoss:

12:47:17,978 ERROR [[HtmlAdaptor]] Servlet.service() for servlet HtmlAdaptor threw exception java.lang.ClassNotFoundException: org.springframework.jms.support.destination.DestinationResolver

So we’ll have to figure out what that’s about.

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