One leak source has been found. Producer sessions were started as (note false) session = conn.createTopicSession(false, TopicSession.AUTO_ACKNOWLEDGE); Consumer sessions started as (note true) session = conn.createTopicSession(true, TopicSession.AUTO_ACKNOWLEDGE); and onMessage(message) contains message.acknowledge(); I think that since producer was not transactional and was with AUTO_ACKNOWLEDGE flag, each time when clint call to message.acknowledge(); instance of org.jboss.mq.AcknowledgementRequest was created. --- I've replased true to false in client side and have removed message.acknowledge(). It helped much!
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