Java RMI ServerException - java.lang.ClassNotFoundException: org.prog.rmi.RmiServer_Stub

Question

I have inherited some Java RMI client/server code, and while it runs fine on one machine, I haven't been able to get it to run in my dev environment.

The problem is when I run the server using the following java.exe -Djava.security.policy=conf\\server.policy -SRC;. -Djava.library.path=. org.prog.rmi.RmiServer java.exe -Djava.security.policy=conf\\server.policy -SRC;. -Djava.library.path=. org.prog.rmi.RmiServer

I get the following error:

java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: 
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
java.lang.ClassNotFoundException: org.prog.rmi.RmiServer_Stub (no security manager: RMI class loader disabled)
    at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:396)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
    at sun.rmi.transport.Transport$1.run(Transport.java:159)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
    ...

My server.policy file is

grant {
    permission java.security.AllPermission;
};

And my java code:

        package org.prog.rmi;

        import java.rmi.Naming;
        import java.rmi.RemoteException;
        import java.rmi.RMISecurityManager;
        import java.rmi.server.UnicastRemoteObject;
        import java.rmi.registry.*; 

        public class RmiServer extends UnicastRemoteObject 
            implements RmiServerIntf {

        private BatchApi bapi;
        private String iniFileLocation;
        private String layoutOption;
        private int addressCount = 0;
        private RefInt apiHandle = new RefInt();


        public RmiServer(String iniFileLocation,String layoutOption) throws RemoteException 
        {   super();
            this.iniFileLocation = iniFileLocation;
            this.layoutOption = layoutOption;
            initAPI();
            startupAPI();
            openAPI();      
        }

        public static void main(String args[]) 
        {
            System.out.println("RMI server started");

            // Create and install a security manager
            if (System.getSecurityManager() == null) 
            {
                System.setSecurityManager(new RMISecurityManager());
                System.out.println("Security manager installed.");
            }
            else
                System.out.println("Security manager already exists.");

            try  //special exception handler for registry creation
            {
                LocateRegistry.createRegistry(1099); 
                System.out.println("java RMI registry created.");
            }
            catch (RemoteException e)
            {
                //do nothing, error means registry already exists
                System.out.println("java RMI registry already exists.");
            }

            try
            {
                //Instantiate RmiServer
                for (String arg: args){
                    System.out.println(arg);
                }

                RmiServer obj = new RmiServer(args[0],args[1]);

                // Bind this object instance to the name "RmiServer"
                Naming.rebind("//127.0.0.1/RmiServer", obj);
                System.out.println("PeerServer bound in registry");

            } 
            catch (Exception e) 
            {
                System.err.println("RMI server exception:");
                e.printStackTrace();
            }
        }    
}

I've seen solutions relating to the java.rmi.server.codebase but didn't have any luck setting this either

Answer 1

您尚未使用rmic重新生成存根，或者注册表无法通过其classpath访问它。

Answer 2

After some further investigation and following RMI tutorials it appeared that there was a problem with the RMI registration server on port 1099.

When I stared the RMI registration server on another port (eg 2005) and changed these lines of code

LocateRegistry.createRegistry(2005);

and

Naming.rebind("//127.0.0.1:2055/RmiServer", obj);

This ran sucessfully without errors and my client was able to connect.

I hope this answer helps others with this error. Let me know if anyone needs any more detailed information.