ClassNotFoundException with RMI

Question

i wrote a program in netbeans with RMI that client has error

error :

java.rmi.UnmarshalException: error unmarshalling return; nested exception is: java.lang.ClassNotFoundException: rmiserver.Message (no security manager: RMI class loader disabled) at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)

but sever does not any error!

interfaace code:

 package rmiclient;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface Message extends Remote {
    void sayHello(String name) throws RemoteException;
}

interface implementation is:

 package rmiserver;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class MessageImpl extends UnicastRemoteObject implements Message {

    public MessageImpl() throws RemoteException {       
    }

    @Override
    public void sayHello(String name) throws RemoteException {
        System.out.println("hello "+name);
    }

}

server code is:

package rmiserver;  
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Main {

    private void startServer(){
        try {
            // create on port 1099
            Registry registry = LocateRegistry.createRegistry(1099);

            // create a new service named myMessage
            registry.rebind("myMessage", new MessageImpl());
        } catch (Exception e) {
            e.printStackTrace();
        }     
        System.out.println("system is ready");
    }

    public static void main(String[] args) {
        Main main = new Main();
        main.startServer();
    }
}

client code is:

package rmiclient;
import java.rmi.RMISecurityManager;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

public class Main {

    private void doTest(){

        try {

            // fire to localhost port 1099
            Registry myRegistry = LocateRegistry.getRegistry("127.0.0.1", 1099);


            // search for myMessage service
            Message impl = (Message) myRegistry.lookup("myMessage");

            // call server's method        
            impl.sayHello("edwin");

            System.out.println("Message Sent");
        } catch (Exception e) {
            e.printStackTrace();
        }       
    }

    public static void main(String[] args) {
        Main main = new Main();
        main.doTest();
    }
}

thanks :).

my code compiled! BUILD SUCCESSFUL (total time: 0 seconds) . but will not run — sara
This code doesn't. You have Message in package rmiclient and the server that implements it in package rmiserver, and there are no import rmiclient.* statements; — user207421

Mahendra Mahendra · Accepted Answer · 2016-03-02T15:36:30

In your stacktrace:

java.lang.ClassNotFoundException: rmiserver.Message

but as per data you have provided, your Message interface is declated with package package rmiclient; and You haven't created any rmiserver.Message class.

Correct the package name.

ClassNotFoundException with RMI

2 Answers