How to respond to UnmarshalExceptions...

When I make a call to a server and I get an UnmarshalException, is there
anyway to know if the call executed on the server and had a connection
error returning the result value (in which case I don't really need to
"retry" or if the call did not execute on the server and I should retry?
This seems like a fairly important distinction when dealing with errors.
Thoughts?

 java.rmi.UnmarshalException: Error unmarshaling return header; nested
exception is: 
        java.net.SocketException: Broken pipe
        at
sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:203
)
        at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:133)
        at
com.tripwire.space.services.server.ServerService_Stub.exec(Unknown
Source)
        at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)

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