Running on separate machines

Question

Hi.
I have an RMI enabled program that communicates fine with each other on the same machine but when I try and run the server on one computer and then call the method from another the whole thing falls to pieces and I can't figure out why!
I have 3 java files:
Alert.javaimport java.rmi.Remote;
import java.rmi.RemoteException;
public interface Alert extends Remote
     String goAlert(int problemNode) throws RemoteException;
}AlertImpl.javaimport java.rmi.Naming;
import java.rmi.RemoteException;
import java.rmi.RMISecurityManager;
import java.rmi.server.UnicastRemoteObject;
public class AlertImpl extends UnicastRemoteObject implements Alert
        static String host = "10.36.168.33";
     public String goAlert(int problemNode)
          System.out.println("There is a problem at node = " + problemNode);
          return "Done!";
     public AlertImpl() throws RemoteException
          super();
     public static void main(String args[])
          if (System.getSecurityManager() == null)
               System.setSecurityManager(new RMISecurityManager());
          try
               AlertImpl obj = new AlertImpl();
               Naming.rebind(host + "/AlertServer", obj);
               System.out.println("AlertServer bound in registry");
          catch (Exception e)
               System.out.println("AlertImpl err: " + e.getMessage());
               e.printStackTrace();
}AlertConsole.javaimport java.rmi.Naming;
import java.rmi.RemoteException;
public class AlertConsole
     String message = "blank";
        String host = "10.36.168.33";
     int problemNode = 10;
     Alert obj = null;
     public static void main(String args[])
          new AlertConsole();
     public AlertConsole()
          try
               obj = (Alert)Naming.lookup(host + "/AlertServer");
               message = obj.goAlert(problemNode);
               System.out.println(message);
          catch (Exception e)
               System.out.println("Exception: " + e.getMessage());
               e.printStackTrace();
}I also have a file "policy" which contains:grant {
     // Allow everything for now
     permission java.security.AllPermission;
};I can bind the server okay but when I try and run AlertConsole on a separate machine I get the following error:h:\jdbc\jdbc\test>java AlertConsole
Exception: 10.36.168.33/AlertServer
java.rmi.NotBoundException: 10.36.168.33/AlertServer
        at sun.rmi.registry.RegistryImpl.lookup(RegistryImpl.java:106)
        at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
        at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:342)
        at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:207)
        at sun.rmi.transport.Transport$1.run(Transport.java:148)
        at java.security.AccessController.doPrivileged(Native Method)
        at sun.rmi.transport.Transport.serviceCall(Transport.java:144)
        at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
        at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
        at java.lang.Thread.run(Thread.java:534)
        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:350)
        at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
        at java.rmi.Naming.lookup(Naming.java:84)
        at AlertConsole.<init>(AlertConsole.java:21)
        at AlertConsole.main(AlertConsole.java:14)Does anyone know what I am doing wrong? I am quite new to using RMI. Any help would be greatly appreciated.
Kind regards,
- Mark

Answer 1

You need a properly formatted url:
Naming.rebind("rmi://10.36.168.33" + "/AlertServer", obj);