How to debug ActiveMQ client?

I'm a fairly new user of ActiveMQ and I'm looking for a way to get detailed debug information on the client side of a queue connection. My problem is this: I have a server that is sending a message through a queue to a client. Using the admin web page associated with the broker, I can verify the following: the queue was created, there is a consumer associated with the queue, the message has been enqueued, the message has been dispatched开发者_Python百科, the dispatched queue size is 1, the message has not been dequeued. This setup was working yesterday but mysteriously stopped working today even though I did a restart of the activemq service. The log file at /var/log/activemq.log does not contain any useful information.

At this point I'm stumped; I'm assuming that there is some sort of problem with the configuration, but it hasn't changed since yesterday. Does anybody have a suggestion about what my next step should be?

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Turn on debug (or even trace) logging in the broker first of all in conf/log4j.properties.

log4j.logger.org.apache.activemq=DEBUG

restart the broker and re-run your scenario. The logging will hopefully provide you with some information. Jconsole is also a useful tool to monitor the running broker.

Does your client use any message filters?

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You can also enable remote debugging and then connect with an IDE. To start remote debugging execute

$ ACTIVEMQ_DEBUG=true bin/activemq

and then start a remote debugger to connect to port 5005