Error unmarshaling return header !!

Dear all,

I'm developing a two sides model using RMI. In the model, at some points 
one object O1 from one side (say A) invokes a method (say X) in an 
object O2 at side B where the method X in turn  invokes a  method Y in 
object O1!!. after I prepare everything (indeed I checked the one-way 
invocation first, and it works fine), the execution is STUCK!!, and the 
case seems to be as a deadlock. BTW, I execute the stuff at single 
machine but in different eclipse projects. The following exception comes 
to the console after I break the execution of one of the two sides.

Exception in thread "main" java.rmi.UnmarshalException: Error 
unmarshaling return header; nested exception is:
    java.net.SocketException: Connection reset
    at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
    at sun.rmi.server.UnicastRef.invoke(Unknown Source)
    at 
java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown 
Source)
    at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
    ...
Caused by: java.net.SocketException: Connection reset
    at java.net.SocketInputStream.read(Unknown Source)
    at java.io.BufferedInputStream.fill(Unknown Source)
    at java.io.BufferedInputStream.read(Unknown Source)
    at java.io.DataInputStream.readByte(Unknown Source)
    ... 13 more


I appreciate any ideas and opinions.
Regards,
Abdullah

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