intermittent connection callback exceptions

Out client is calling on the server to perform some work for it, which 
can take a bit of time,
so we pass a callback object that the client has just created and 
exported, but no bound in
the registry.  Every so often it will throw a NullPointerException when 
we try and call on the
remote object.  My customers are seeing it throw the exception about one 
in three times on
their systems, and I'm seeing around one in seven on mine.



Exception is:
java.lang.NullPointerException
 at 
sun.rmi.transport.tcp.TCPConnection.getOutputStream(TCPConnection.java:66)
 at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:202)
 at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:184)
 at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:110)
 at hec.client.RmiProgressImpl_Stub.printStatus(Unknown Source)
 at hec.server.RmiAppImpl.openWorkspace(RmiAppImpl.java:745)

using java 1.6. client is XP and the server is Solaris.

So any ideas of where to look?  Don't see any exceptions generated on 
the client side.


Thanks
Mark

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