RMI TCP Connection error

Before we submitted a ticket to support we wanted to ask the community if anyone had experienced the following STDOUT in the server.log. We are running Percussion (Rhythmyx) 6.7. The problem started to occur after a user reported that the system was unresponsive and we attempted to shutdown the system. The shutdown sequence resulted in the following error:

2010-11-08 11:53:32,112 INFO  [STDOUT] Exception in thread "RMI TCP Connection(idle)" 
2010-11-08 11:53:32,112 INFO  [STDOUT] java.lang.NoClassDefFoundError: Could not initialize class sun.rmi.transport.ConnectionInputStream
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at sun.rmi.transport.StreamRemoteCall.getInputStream(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at sun.rmi.transport.Transport.serviceCall(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
2010-11-08 11:53:32,112 INFO  [STDOUT] 	at java.lang.Thread.run(Unknown Source)