RMI remote Exception

[Farzane Arabi]

I have some problem in working on java RMI in netbeans IDE6.0
when I run the server this exception is represented :

Remote exception: java.rmi.ConnectException: Connection refused to host: 192.168.73.68; nested exception is:
java.net.ConnectException: Connection refused: connect
It seems I have no permisson to port, and I dont know how I can activate the premission

I'll be thank ful if you help me

the code is as symple as below:

import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;

public class SampleServerImpl extends UnicastRemoteObject
                             implements SampleServer
{
  SampleServerImpl() throws RemoteException
  {
     super();
  }

  public int sum(int a,int b) throws RemoteException
  {
     return a + b;
  }
  


  public static void main(String args[])
  {
      
     
    //set the security manager
    try
      {
//        System.setSecurityManager(new RMISecurityManager());

        //create a local instance of the object
        SampleServerImpl Server = new SampleServerImpl();

        //put the local instance in the registry
        
        Naming.rebind("SAMPLE-SERVER" , Server);

        System.out.println("Server waiting.....");
      }
    catch (java.net.MalformedURLException me)
      {
         System.out.println("Malformed URL: " + me.toString());
      }

    catch (RemoteException re)
      {
         System.out.println("Remote exception: " + re.toString());
      }

  }

[Oscar Costa]

You started the rmiregistry?

Try this code from server side:

// Create the object
SampleServerImpl server = new SampleServerImpl();
// Export the object
SampleServerImpl serverStub =  UnicastRemoteObject.exportObject(server, 0);
// Registry the object 
Registry registry = LocateRegistry.getRegistry();
registry.rebind("SAMPLE-SERVER" , serverStub); 

Look at official sun documentation http://java.sun.com/javase/6/docs/technotes/guides/rmi/index.html

[Farzane Arabi]

Thank you Oscar for your help,
I inserted your code but unfotunatly after debug this line:

"Remote serverStub = UnicastRemoteObject.exportObject(Server, 0);"

this exception represented:

"Remote exception: java.rmi.server.ExportException: object already exported"

It seems there is no need to export the object by insrting this line and and making an obbject of "SampleServerImpl" is enougth to export the Server object,
If there is any idea I'll be thankful

[Treimin Clark]

Farzane,

It's a bit difficult to read through your code. Please use code tags in future.

[Nitesh Kant]

Farzane Arabi wrote:
It seems there is no need to export the object by insrting this line and and making an obbject of "SampleServerImpl" is enougth to export the Server object,

Yeah you do not need to export it. UnicastRemoteObject constructor exports automatically.
Did you try to use the rmi registry as told by Oscar?
Naming requires the name to be in the format of a URL and not a simple name. See javadocs for details.