[newbie] javax.naming.NameNotFoundException: toaster

[jon80]

I'm trying out a tutorial example, and, noted that when running the last line of the batch file, it can't seem to find the toaster , although when running the command by opening a console window and simply typing the last line it seems to work.

run_demo.bat
@echo off
rem demonstrates the use of calling a remote method
rem javac Product*.java
rmic -v1.2 ProductImpl 2> rmic.error.log
start rmiregistry 2>>rmic.error.log
start java ProductServer 2> ProductServer.log  //I have to run this manually; otherwise an err is displayed (see error).
java ProductClient 
pause

Product.java
 import java.rmi.*;

 
  /**
     The interface for remote product objects.
  */
  public interface Product extends Remote
  {
     /**
        Gets the description of this product.
       @return the product description
    */
    String getDescription() throws RemoteException;

 }


ProductClient.java
 import java.rmi.*;

  import java.rmi.server.*;

  import javax.naming.*;


  /**
     This program demonstrates how to call a remote method
     on two objects that are located through the naming service.
  */
  public class ProductClient
 {
    public static void main(String[] args)
    {
       System.setProperty("java.security.policy", "client.policy");

       System.setSecurityManager(new RMISecurityManager());

       String url = "rmi://localhost/";

 /*TODO change to "rmi://yourserver.com/" when server runs on remote machine
 		yourserver.com*/
       try
       {
          Context namingContext = new InitialContext();

          Product c1 = (Product) namingContext.lookup(url + "toaster");

          Product c2 = (Product) namingContext.lookup(url + "microwave");


          System.out.println(c1.getDescription());

          System.out.println(c2.getDescription());

       }
       catch (Exception e)
       {
          e.printStackTrace();

       }
    }
 }

ProductImpl.java
  import java.rmi.*;

  import java.rmi.server.*;

 
  /**
     This is the implementation class for the remote product
     objects.
  */
  public class ProductImpl
     extends UnicastRemoteObject
    implements Product
 {
    /**
       Constructs a product implementation
       @param n the product name
    */
    public ProductImpl(String n) throws RemoteException
    {
       name = n;

    }

    public String getDescription() throws RemoteException
    {
       return "I am a " + name + ". Buy me!";

    }

    private String name;

 }

ProductServer.java
  import java.rmi.*;
  import java.rmi.server.*;
  import javax.naming.*;


  /**
     This server program instantiates two remote objects,
     registers them with the naming service, and waits for
     clients to invoke methods on the remote objects.
  */
 public class ProductServer
 {
    public static void main(String args[])
    {
       try
       {
          System.out.println("Constructing server implementations...");


          ProductImpl p1 = new ProductImpl("Blackwell Toaster");
          ProductImpl p2 = new ProductImpl("ZapXpress Microwave Oven");


          System.out.println("Binding server implementations to registry...");
          Context namingContext = new InitialContext();
          namingContext.bind("rmi:toaster", p1);
          namingContext.bind("rmi:microwave", p2);
          System.out.println("Waiting for invocations from clients...");

       }
       catch (Exception e)
       {
          e.printStackTrace();
       }
    }}

Error
Displayed when running run_demo.bat
javax.naming.NameNotFoundException: toaster
        at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
        at com.sun.jndi.toolkit.url.GenericURLContext.lookup(Unknown Source)
        at javax.naming.InitialContext.lookup(Unknown Source)
        at ProductClient.main(ProductClient.java:35)
Press any key to continue . . .

Environment notes:
Microsoft Windows [Version 6.0.6001] //Windows Server 2008 x64
Copyright (c) 2006 Microsoft Corporation. All rights reserved.

C:\Users\Administrator>java -version
java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) 64-Bit Server VM (build 14.0-b16, mixed mode)

C:\Users\Administrator>

[Eranga]

at ProductClient.main(ProductClient.java:35)

Did you check that what's on the above line?

[jon80]

ProductClient.java
...
try
       {
          Context namingContext = new InitialContext();

          Product c1 = (Product) namingContext.lookup(url + "toaster");

          Product c2 = (Product) namingContext.lookup(url + "microwave");


          System.out.println(c1.getDescription());

          System.out.println(c2.getDescription()); //line 35 
....
       }
...

NOTE: It would be helpful to have the functionality that tags automatically generate line numbers (editable).

[Eranga]

Hmmm, your error message notify something invalid naming conventions. Let see your complete code.

[Singing Boyo]

I'd look for an error in whatever class c2 is. It's definitely a class that implements Product, but there appears to be an error in the getDescription() method, which would be implemented in the class itself.