null jms exception

Using openjms v0.7.7 beta 1

It seems that after a long period of time I start getting this
exception repeatedly when I try to publish a message on a topic.

null
	org.exolab.jms.client.net.JMSExceptionAdapter.adapt(JMSExceptionAdapter.java:79)
	org.exolab.jms.server.net.RemoteServerSession__Proxy.send(RemoteServerSession__Proxy.java:393)
	org.exolab.jms.client.net.JmsSessionStubImpl.send(JmsSessionStubImpl.java:153)
	org.exolab.jms.client.JmsSession.sendMessage(JmsSession.java:1164)
	org.exolab.jms.client.JmsMessageProducer.send(JmsMessageProducer.java:359)
	org.exolab.jms.client.JmsTopicPublisher.publish(JmsTopicPublisher.java:137)
	org.exolab.jms.client.JmsTopicPublisher.publish(JmsTopicPublisher.java:92)
	monitor.realtime.msg.MSGEngine.putOutgoingAll(MSGEngine.java:1096)
	monitor.realtime.msg.MSGEngine.processQuery(MSGEngine.java:1065)
	monitor.realtime.msg.MSGEngine.run(MSGEngine.java:135)

The message is null and the stack trace doesn't help me much. It ends
on my part of the program where I just put a message on a topic.

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