applied patch from Hiroshi Ayukawa to ensure that object stream marshalling is all released - many thanks! For discussion see: http://www.nabble.com/Broker-used-up-the-memory-tf2316972.html#a6598182
incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/command/ActiveMQObjectMessage.java