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Passing the UUID should be the easy part, the tricky bit is performing an RPC from Java to C++. How are you doing that? Once you sort that out, passing arguments should be straight forward.
Note: Java's RMI only works between a client server running RMI. To connect to C++ server, you need to use a Java client library which is compatible with your C++ server.
If you still don't know how to perform the RPC call, I suggest you contact the people supporting the C++ program as they should know how RPC calls are made currently. If they don't know, it is highly unlikely we can guess a solution unless you are willing to change the C++ server to use a known RPC mechanism.