@artnaseef, thanks for the quick response - I didn't expect a reply over the weekend so didn't bother to check sooner :-)
Yes, you are correct. Both the QueueSize and the PendingQueueSize of the Queues and Topics respectively are 0. The client side is JMS and looking at the code I did find the bug where a session and producer was being created a send a message and were never closed. Thanks for pointing out, you saved my day! I wonder if there is a way to ask the broker to close idle producers? Or at least limit the number of producers to prevent badly written clients from messing up the broker. -- View this message in context: http://activemq.2283324.n4.nabble.com/activemq-broker-running-out-of-heap-memory-tp4678656p4678666.html Sent from the ActiveMQ - User mailing list archive at Nabble.com.