AMQ-4033: JMX/RMI management do not use custom RMIServerSocketFactory as it cannot be unregistered, and then the JVM has strong reference and classloader cannot unload class. This causes problems for embedding brokers in container and if you redeploy.
activemq/trunk/activemq-core/src/main/java/org/apache/activemq/broker/jmx/ManagementContext.java