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Displaying Hello using RMI

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This Example describes the way to display Hello message using RMI. By RMI we mean Remote Method Invocation. RMI serves as a basic technique for supporting distributed objects in java.

Displaying Hello using RMI

     

This Example describes the way to display Hello message using RMI. By RMI we mean Remote Method Invocation. RMI serves as a basic technique for supporting distributed objects in java. The steps involved in displaying message Hello are described below:-

Step1.Create a Remote interface named HelloInterface.java in the Directory.

HelloInterface.java:-

 

import java.rmi.*;
public interface HelloInterface extends Remote {
  public String say() throws RemoteException;
}

 
Step2.
Create an Remote Class implementation for HelloWorld named Hello.java in the Directory.


Hello.java

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

public class Hello extends UnicastRemoteObject 
 implements 
HelloInterface {
  private String message;
  public Hello (String msg) throws RemoteException {
  message = msg;
  }
  public String say() throws RemoteException {
  return message;
  }
}


Step3.
Compile the above two Source file named HelloInterface.java and Hello.java.



Step4.
After compiling the above two classes type the following command i.e-"rmic Hello" in console just like displayed below.




Your Directory Structure will be like this.By running the "rmic Hello" command a new class will be created i.e "Hello_Stub.class" in the directory




Step5.Create Server application named HelloServer.java

HelloServer.java

import java.rmi.Naming;

public class HelloServer 
{
  public static void main (String[] argv) 
  {
  try {
  Naming.rebind 
   (
"Hello"new Hello ("Hello,From Roseindia.net pvt ltd!"));
  System.out.println 
  (
"Server is connected and ready for operation.");
  
  catch (Exception e) {
  System.out.println ("Server not connected: " + e);
  }
  }
}

Step6.Create Client application named HelloClient.java

HelloClient.java

import java.rmi.Naming;

public class HelloClient 
{
  public static void main (String[] argv) {
  try {
HelloInterface hello =(HelloInterface)
 Naming.lookup (
"//192.168.10.201/Hello");
  System.out.println (hello.say());
  
  catch (Exception e){
  System.out.println ("HelloClient exception: " + e);}
  }
}


Step6.
Compile both of the files.

Step7.Type "rmicregistry" on commandprompt and press ENTER.

 

Step8.Type java HelloServer in commandprompt and press ENTER.The following message will be displayed on console.


Step9.Now,open another separate command terminal,and run the client application like shown in the figure given below:-


Step10. If the message similar to the above appears in figure comes means that you have implemented your RMI application.

 

Download Source Code

 

     

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Posted on: September 29, 2008

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Comments:9
Anshul Agarwal
June 28, 2011
Error in the above example

When I am executing the command "java Hello Server" this error is coming : D:\wkspc23July\MyHello\src>java HelloServer Server not connected: java.rmi.ServerException: RemoteException occurred in serv er thread; nested exception is: java.rmi.UnmarshalException: error unmarshalling arguments; nested excep tion is: java.lang.ClassNotFoundException: Hello_Stub The Hello_Stub file is alredy created.
prashantniku
November 28, 2011
Java

Some correction in above program 1. Use rmiregistry on Step 7. 2. In HelloClient.java please change 192.168.10.201 to ur ip address.. you can find one by going to cmd and type the command ipconfig.. Thanks for this wonderful program.. :)
Kushal
April 22, 2012
Thanks

thanks a lot for such a meaning full Knowledge ....
kishan
December 8, 2012
problem

when i compile Hello.java it gives error: cant find symbol "HelloInterdface"
mamuka
November 25, 2012
exceptions

hello friends 1. i am getting connection refused to host when running this rmi codes 2. rmicregistry does'nt working , i have jdk7 may be it causes? best regards mamuka arabuli
safvan
January 1, 2013
rmi

I am getting rmiregistry error when i am running the application
safvan
January 1, 2013
rmi running problem

whenever i am typing rmi Hello it gives class Hello not found please help me
SIDHIDATRI NAYAK
December 3, 2012
rmi

rmicregistry is not executing the error is this is not an internal or external command
vaish
July 2, 2013
asking doubt

while i exeute hello.java getting errors as cannot find symbol sir... pls send solution for me to my mail
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