Question

When I try to run an RMI client after running the RMI server I get the following exception:

EncodeInterface exception: java.lang.ClassCastException: $Proxy30 cannot be cast to hw2.chat.backend.main.EncodeInterface
java.lang.ClassCastException: $Proxy30 cannot be cast to hw2.chat.backend.main.EncodeInterface
at hw2.chat.backend.main.EncodingRmiClient.initialiseRMIClient(EncodingRmiClient.java:26)

And the relevant code in the RMI client is:

EncodeInterface encodeInterface;
Registry registry = LocateRegistry.getRegistry(host, portNumber);
encodeInterface = (EncodeInterface)registry.lookup("RmiEncodingServer"); //line 26

And in the RMI server:

    try
    {
        EncodeInterface encodeInterface = new EncoderImpl();
        Registry registry = LocateRegistry.getRegistry();
        registry.rebind("RmiEncodingServer", encodeInterface);
        System.out.println("RmiEncodingServer is running...");
    }

EncodeInterface is the interface that extends Remote and that is present in the client side too.

Host is “127.0.0.1” and portNumber is 1099 (I am assuming it should be the default value which is 1099 since I didn’t specify it when I ran my RmiEncodingServer).

If I don’t run the RMI server I get the same exception, any ideas as to why this is happening?

thanks

Answer 1

The problem was that I had a different package name on the server and client side, but the classes distributed to the client need to be exactly the same as in the server..