Re: ClassNotFoundException while running Server class

This problem is solved! It was due to the fact, that I did not specify
the server.code property at server startup.

Best regards,
Sebastian


Sebastian Konietzny wrote:
> Dear all,
>
> I am new to RMI and I am not so used to programming in Java anyway.
>
> I am writing you this email, because I have a problem with my small RMI
> testing scenario and until now I couldn't find an answer to my problem
> in the web.
>
> So, here is what my problem is about:
>
> I have a ServerApplication class that creates a remote object and
> imports the appropriate interface definition.
>
>
> ====================================================================
> package rpc_testing.server;
>
> import rpc_testing.rmi.RemoteProcessExecutableIF;
> import java.rmi.server.*;
> import java.rmi.registry.Registry;
> import java.rmi.registry.LocateRegistry;
>
> public class RpcTestServerApplication {
>
>     public RpcTestServerApplication() {
>     }
>
>     public static void main(String[] args) {
>         try {
>             RapidMinerExecutioner rapExec = new RapidMinerExecutioner();
>             RemoteProcessExecutableIF stub = (RemoteProcessExecutableIF)
> UnicastRemoteObject.exportObject(rapExec, 0);
>
>             // Bind the remote object's stub in the registry
>             Registry registry = LocateRegistry.getRegistry();
>             registry.bind("RemoteProcessExecution", stub);
>
>             System.err.println("Server ready");
>         } catch (Exception e) {
>             System.err.println("Server exception: " + e.toString());
>             e.printStackTrace();
>         }
>     }
> }
> ===================================================================
>
>
> Starting the ServerApplication I receive the following Exceptions:
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> Server exception: java.rmi.ServerException: RemoteException occurred in
> server thread; nested exception is:
>     java.rmi.UnmarshalException: error unmarshalling arguments; nested
> exception is:
>     java.lang.ClassNotFoundException:
> rpc_testing.rmi.RemoteProcessExecutableIF
> java.rmi.ServerException: RemoteException occurred in server thread;
> nested exception is:
>     java.rmi.UnmarshalException: error unmarshalling arguments; nested
> exception is:
>     java.lang.ClassNotFoundException:
> rpc_testing.rmi.RemoteProcessExecutableIF
>     at
> sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:385)
>     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
>     at sun.rmi.transport.Transport$1.run(Transport.java:153)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
>     at
> sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
>     at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
>
>     at java.lang.Thread.run(Thread.java:595)
>     at
> sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
>
>     at
> sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
>     at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:343)
>     at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
>     at
> rpc_testing.server.RpcTestServerApplication.main(RpcTestServerApplication.java:20)
>
> Caused by: java.rmi.UnmarshalException: error unmarshalling arguments;
> nested exception is:
>     java.lang.ClassNotFoundException:
> rpc_testing.rmi.RemoteProcessExecutableIF
>     at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
>     at
> sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:375)
>     at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
>     at sun.rmi.transport.Transport$1.run(Transport.java:153)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at sun.rmi.transport.Transport.serviceCall(Transport.java:149)
>     at
> sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:466)
>     at
> sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:707)
>
>     at java.lang.Thread.run(Thread.java:595)
> Caused by: java.lang.ClassNotFoundException:
> rpc_testing.rmi.RemoteProcessExecutableIF
>     at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
>     at java.security.AccessController.doPrivileged(Native Method)
>     at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>     at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
>     at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
>     at java.lang.Class.forName0(Native Method)
>     at java.lang.Class.forName(Class.java:242)
>     at
> sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:707)
>     at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:651)
>     at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:588)
>     at
> java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:628)
>     at
> java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294)
>     at
> sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:238)
>
>     at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1500)
>     at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1463)
>     at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1699)
>     at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
>     at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
>     ... 9 more
>
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>
>
> The ServerApplication is running on the same computer as the
> "rmiregistry"-script. So, I doubt that my problem is about wrong
> settings of the Server codebase property! In fact I made no such
> settings so far.
>
>
> Can you help me and tell me what might be the problem?
>
>
> Best regards,
> Sebastian
>

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