Fix for AMQ-1053. Added support for pluggable message transformation together with an implementation using XStream to marshall ObjectMessage instances as TextMessages. See the XStreamTransformTest to see how a producer can send ObjectMessages but then consumers can see either ObjectMessages or TextMessages depending on their requirements.
incubator/activemq/trunk/activemq-core/src/main/java/org/apache/activemq/ActiveMQConnection.java
incubator/activemq/trunk/activemq-optional/src/main/java/org/apache/activemq/util/xstream/