[Okta Webinar] Learn how to a build a cloud-first strategyRegister Now

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 444
  • Last Modified:

rmiregistry on Windows NT

Hi everyone,

I have a demo sample of the RMI code from Java Network Programming from O'Reilly.
A sample of the code follows.
Basically when I start the rmiregistry on my HP-UX box and then I start the
"java HelloImpl", it gives the message Server Ready and I'm able to run my
HelloClient in my client machine.

My problem is that when I start the rmiregistry and the HelloImpl on my NT
box, I don't get any message "Server ready" and my HelloClient fails with the
following message: "java.rmi.NotBoundException: hello"

How can I make it work with Windows NT?

Thanks

Jonny

/* Hello.java */
import java.rmi.*;
public interface Hello extends Remote
{
   public String sayHello() throws java.rmi.RemoteException;
}

/* HelloImpl.java */
import java.rmi.*;
import java.rmi.server.*;
import java.net.*;

public class HelloImpl extends UnicastRemoteObject implements Hello
{
    public HelloImpl() throws RemoteException
    {
       super();
    }
    public String sayHello() throws RemoteException
    {
       return "Truncated";
    }
    public static void main (String args[])
    {
       try
       {
          HelloImpl h = new HelloImpl();
          Naming.rebind("hello",h);
          System.out.println("Server ready");
       }
       catch (RemoteException re)
       {
          System.out.println("Exception: " + re);
       }
       catch (Exception e)
       {
          System.out.println("Malformed: " + e);
       }
    }
}

/* HelloClient.java */
import java.rmi.*;

public class HelloClient
{
   public static void main(String args[])
   {
      System.setSecurityManager( new RMISecurityManager());
      try {
         Hello h = (Hello) Naming.lookup("hello");
         String message = h.sayHello();
         System.out.println("Client: " + message);
      }
      catch (Exception e) {
         System.out.println("Exception: " + e);
      }
   }
}
0
Jonny071797
Asked:
Jonny071797
  • 4
  • 3
1 Solution
 
ashishagarwalCommented:
Jonny,

make sure of teh following :

1. You have TCPIP set up and have a hostname/ipaddress for your NT m/c.
2. you have an entry for your hostname in the hosts file:
on NT its in c:\winnt\system32\drivers\etc\hosts

once its up!! then your application shoudl run!!

best of luck!!



0
 
Jonny071797Author Commented:
Thanks for your help ashishagarwal, but is doesn't help. I have TCP/IP installed and running on my NT workstation.

When I run the HelloClient, it gives me the exception: java.rmi.NotBoundException: Hello

I also tried to move put "rmi://localhost/hello" on the HelloClient but same thing happens.

I believe the problem is on the HelloImpl not finding the rmiregistry.


0
 
alvinwangCommented:
how about using 127.0.0.1:1099 which is the default port for rmi?
0
Concerto Cloud for Software Providers & ISVs

Can Concerto Cloud Services help you focus on evolving your application offerings, while delivering the best cloud experience to your customers? From DevOps to revenue models and customer support, the answer is yes!

Learn how Concerto can help you.

 
Jonny071797Author Commented:
The same thing happens using localhost, 127.0.0.1:1099, or leaving it "hello" only.

I believe the problem is related to the server (HelloImpl.java).
It should detect that rmiregistry ir running and give me the "Server Ready" message.

0
 
ashishagarwalCommented:
jonny,

did you check your hosts file ????

do you have a name for your m/c and have an entry for i in your hosts file ???

it is ESSENTIAL to have an hosts entry in the hosts file.. Look at my earlier answer for location for the hostsfile...
0
 
Jonny071797Author Commented:
my first entry in the hosts file is
127.0.0.1       localhost

I can also ping localhost and it returns 127.0.0.1.
0
 
ashishagarwalCommented:
Jonny,

We keep working on RMI almost everyday.. and we use the following and it seems to work :

1. We have a hostname for our host say MyHost ( Contol Panel-->network setting->Tcp-ip-> dns --> hostname = myhost

2. have an entry in your hostfile for myhost

myhost xxx.xxx.xxx.xxx

3. use fully qualified url for naming.rebind() in Rmi server
  "//myhost/hello"

4. try out the examples which come with JDK1.1.x.. the tutorial will of of great help !!


0
 
Jonny071797Author Commented:
Hi Ashishagarwal,

Thanks for your help. It still doesn't seem to work, but I'll have a look at the samples from JDK.
0

Featured Post

Concerto's Cloud Advisory Services

Want to avoid the missteps to gaining all the benefits of the cloud? Learn more about the different assessment options from our Cloud Advisory team.

  • 4
  • 3
Tackle projects and never again get stuck behind a technical roadblock.
Join Now