Client on different Machine - No route to host

Question

Hi,
I'm pretty much frustrated right now. I try to get the following running for more than days now, hopefully someone can help me, since it seems to be a quite simple problem:
I have a Client/Server RMI Application, to make my first steps with RMI.
First I defined the Interface Server.java:
import java.rmi.*;
public interface Server extends Remote
     int getValue() throws RemoteException;
then I implented the Server (ServerImpl.java):
import java.util.*;
import java.rmi.server.*;
import java.rmi.RemoteException;
public class ServerImpl extends UnicastRemoteObject implements Server
     private int value;
     public ServerImpl() throws RemoteException
          this.value = 3;
     public int getValue() throws RemoteException
          return this.value;
and a process which uses it (ServerProc.java):
import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.UnicastRemoteObject;
class ServerProc
     public static void main (String args [])
          if(System.getSecurityManager() == null)
               System.setSecurityManager(new RMISecurityManager());
          try {
               ServerImpl obj = new ServerImpl();
               Naming.rebind("rmi://localhost/Server",obj);
          }catch (Exception e){
               System.out.println(e);
My Client is as follows (Client.java):
import java.rmi.*;
class Client
     public static void main(String args [])
          Server server;
          try {
               server = (Server)Naming.lookup("rmi://192.168.0.1/Server");
               System.out.println(server.getValue());
          }catch(Exception e){
               System.out.println(e);
The Server is on the machine with IP 192.168.0.1 and the Client on the Machine 192.168.0.15. (both XP SP2)
I compiled the sercer code with "javac ServerProc.java" und afterwards did "rmic ServerImpl"
then I run the rmiregistry with "start rmiregistry" und the server with "java -Djava.security.policy=java.policy ServerProc"
The policy file is the following:
grant{
permission java.security.AllPermission;
Then I compiled the Clientcode on the client to which I first copied the "Server.class" and "ServerImpl_Stub.class" Files and then did "javac Client.java"
And run the Client with "java Client".
THen the following exception appears:
java.rmi.ConnectIOException: Exception creating connection to: 192.168.120.254;
nested exception is:
java.net.NoRouteToHostException: No route to host: connect
I don't know where this IP adress comes from, but when I run the same client on the server machine It works without problems. I have no clue what to do.
Can someone help me please. That would be great.
Thanks in advance
Ben

Answer 1

i feel your pain same happen to me all i can advise
is to lose the " System.setSecurityManager(new
RMISecurityManager());
if you don't call it it will revert to the default
one.No it doesn't, it reverts to no security manager, and absence of stubs wouldn't cause NoRouteToHost either.
Your problem seem to be either a DNS problem where the server host doesn't know its own IP address or else it has > 1 NIC and an inconvenient choice is being made between them. In case 1, fix the DNS; in case 2, set -Djava.rmi.server.hostname to the desired IP address in the server JVM.