As with CORBA, the client needs a way to find the remote object. We will use Sun bootstrap registry service. This is a global naming service, so name clashes are a problem. This is not recommended for registering small objects (like our calculator). The bootstrap registry service should be used to locate other locator objects.

• Need “import java.rmi.*”

• Need “import java.rmi.server.*”

• Need “import javax.naming.*”
  Instantiate an implementation object.
  CalculatorImpl calc = new CalculatorImpl();

• Create a naming context.
  Context namingContext = new InitialContext();

• Register the object with the naming service.
  namingContext.bind("rmi:calculator", calc);

• Do this all in a try-catch block.

  package calc;
  import java.rmi.;
  import java.rmi.server.;
  import javax.naming.*;
  public class CalcServer
  {
  //Method main() goes here.
  }

public static void main(String args[])  
{  
    try  
    {  
        CalculatorImpl calc = new CalculatorImpl();  
        Context namingContext = new InitialContext();  
        namingContext.bind("rmi:calculator", calc);  
        System.out.println("Remote CalcServer ready...");  
    }  
    catch (Exception e)  
        { System.out.println("Exception while registering: " + e); }  
    } //End main.  

• Start the RMI registry.
  UNIX: rmiregistry &
  Windows: start rmiregistry
• Start the server
  UNIX: java CalcServer &
  Windows: start java CalcServer
• Using a batch file:
  start rmiregistry
  pause
  start java calc.CalcServer
  pause

Control-C to exit

• Need “import java.rmi.*”

• Need “import java.rmi.server.*”

• Need “import javax.naming.*”

• Create a naming context.
  Context namingContext = new InitialContext();

• Look up the object with the naming service.
  namingContext.lookup("rmi://localhost/calculator”);

• Do this all in a try-catch block.

• Look up the object with the naming service.

• Extend url for a remote system.
  namingContext.lookup(
  "rmi://unixapps1.wright.edu:2024/calculator”);

• Wrap all methods with
  “try -- catch(RemoteException e)”

• This includes any methods using the remote object.
  e.g. the GUI, even though in a separate class.

• Requires import java.rmi.*;

  package calc;
  import java.rmi.;
  import java.rmi.server.;
  import java.rmi.*;
  public class RunCalc2Gui
  {
  //Method main() here.
  }//RunCalc2Gui

public static void main(String args[])  
{  
    Calculator c = null;  
    String hostname = null;  
    String path = null;  
    if (args.length < 1)  
    {  
      System.out.println(  
      "Usage: java CalculatorClientR <hostname> (<port>)");  
      System.exit(1);  
    }  

**optional**  

    hostname = args[0];  
    path = "rmi://"+hostname+"/";  
    if (args.length > 1)  
        path = path+":"+args[1];  
    path = path+"calculator";  
    System.out.println("Looking up "+path);  
    try { c = (Calculator)namingContext.lookup(path); }  
    catch (Exception e)  
    {  
      System.out.println("Lookup error.");  
      System.exit(1);  
    }  
    //Same as before:  
    Calc2Gui ui = new Calc2Gui(c);  
}//main  

This information was taken from Dr. Hartrum's slides on RMI.