DefaultMessageListenerContainer-consumers not decreasing when idle

[geertp]

Hi,

I have a basic configuration of the DefaultMessageListenerContainer (Spring 3.0.x), for an ActiveMQ jms queue.

	<bean id="Agent-jms" class="org.springframework.jms.listener.DefaultMessageListenerContainer">
		<property name="connectionFactory" ref="jmsFactory" />
		<property name="destination" ref="agentServiceQueue" />
		<property name="messageSelector" value="JMSCorrelationID is null" />
		<property name="messageListener">
			<bean class="org.springframework.jms.listener.adapter.MessageListenerAdapter">
				<constructor-arg ref="agentService.jmsListener" />
			</bean>
		</property>
		<property name="errorHandler" ref="agentService.jmsListener" />
		
      <property name="maxConcurrentConsumers" value="100" />		
</bean>

When the load on the queue increases, I see additional consumers being started, so that works.
However, when the queue is empty again, all consumers stay alive, none of them quit.

I would expect, based on the api docs and on Bruce Snyders excellent explanations [1] that idleTaskExecutionLimit which defaults to 1, would have all consumers quit after 1 timed out poll.
See attached image [2] for a graph on the number of consumers by queue (the sudden drop around 'thu 12:00' is from the container restarting).
The number of consumers only rises, it never decreases...


Is there something I overlooked?

With kind regards,
Geert


[1] http://bsnyderblog.blogspot.com/2010...mption-in.html
[2] jmx_dco_jms_consumercount-day.jpg

[geertp]

Does anyone have an idea about this? Or is my problem statement not clear?