Java RMI program error

Question

Dear friends,
I am running an RMI example program,
have used rmic to generate the stub and skeleton class, have used rmiregistry 1010 to start registry service, and used java Pi to start the server, but there are errors generated as follows,
Error --java.rmi.UnknownHostException: Unknown host:Default; nested exception is:
java.net.UnknownHostException:Default
java.rmi.UnknownHostException: Unknown host:Default; nested exception is:
java.net.UnknownHostException:Default
java.net.UnknownHostException:Default
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getAllByName0(Unknown Source)
at java.net.InetAddress.getByName(Unknown Source)
at java.net.Socket.<init>(Unknow Source)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknow Source)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknow Source)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknow Source)
at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknow Source)
at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknow Source)
at sun.rmi.server.UnicastRef.newCall(Unknow Source)
at sun.rmi.registry.Registry_Stub.bind(Unknow Source)
at java.rmi.Naming.bind(Unknown Source)
at Pi.main(Pi.java:23)
the program codes are as follows,
//server interface
import java.rmi.*;
interface PiRemote extends Remote {
double getPi() throws RemoteException;
//server
import java.net.*;
import java.rmi.*;
import java.rmi.registry.*;
import java.rmi.server.*;
public class Pi extends UnicastRemoteObject
implements PiRemote {
public double getPi() throws RemoteException {
return Math.PI;
public Pi() throws RemoteException {
public static void main(String[] arguments) {
System.setSecurityManager(new
RMISecurityManager());
try {
Pi p = new Pi();
Naming.bind("//Default:1010/Pi", p);
} catch (Exception e) {
System.out.println("Error -- " +
e.toString());
e.printStackTrace();
//client
import java.rmi.*;
import java.rmi.registry.*;
public class OutputPi {
public static void main(String[] arguments) {
System.setSecurityManager(
new RMISecurityManager());
try {
PiRemote pr =
(PiRemote)Naming.lookup(
"//Default:1010/Pi");
for (int i = 0; i < 10; i++)
System.out.println("Pi = " + pr.getPi());
} catch (Exception e) {
System.out.println("Error -- " + e.toString());
e.printStackTrace();
who know how to resolve the problem, thank you in advance:)

Answer 1

I do always use the ip adress/port
You can find it by
try {
     ipLocal = InetAddress.getLocalHost();
     catch(Exception e) {
          new PopUpMessage("ERROR","Error in searching IP", true);
system.out.println("Your IP address is " + ipLocal.getHostAddress());