Hi Marc,
I'm glad you solved the problem.
As for the m_map field, I don't know what that's about. org.jboss.remoting.transport.socket.LRUPool is derived from a class, org.jboss.util.LRUCachePolicy, that comes from an external jar, jboss-common-core.jar. Remoting 2.5.4.SP4 is built against version 2.2.16.GA of jboss-common-core.jar. Maybe there's incompatibility with the version you're using.
-Ron