Why am I getting java.rmi.NotBoundException exception on localhost rmi test.

[Jo Jake]

I am new to Java as well as rmi. While running a test code I end up with exceptions and couldn't make it work. All I had is just a hello message from server. I get the java.rmi.NotBoundException when I call Naming.lookup I tried with different values for lookup url such as rmi://127.0.0.1/serviceA, rmi://localhost/serviceA etc ..but nothing did worked for me. Anyone please could help me to get this working.

Here is my server code :

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

public class MyRemoteImp1 extends UnicastRemoteObject implements MyRemote {
	public MyRemoteImp1() throws RemoteException {
	}

	public String sayHello() {
		return "Hey! from Server";
	}

	public static void main(String[] args) throws RemoteException {
		try {
			MyRemoteImp1 service = new MyRemoteImp1();
			Naming.rebind("serviceA", service);
		} catch (Exception e) {
		}
	}
}

And this server code compiles and runs without any issues.

Client code :

import java.net.MalformedURLException;
import java.rmi.Naming;
import java.rmi.RemoteException;

public class rmiclient {

	public static void main(String[] args) throws RemoteException,
			MalformedURLException {
		String[] services = Naming.list("rmi://127.0.0.1/");
		for (String service : services) {
			System.out.println(service);
		}

		MyRemote ser = null;
		try {
			ser = (MyRemote) [color=red]Naming.lookup[/color]("rmi://localhost/serviceA");
		} catch (Exception e) {
			e.printStackTrace();
		}

		String s = ser.sayHello();
		System.out.println(s);
	}
}

The client code compiles without any issues, and on running give the following :
The stack trace of exception :

java.rmi.NotBoundException: serviceA
at sun.rmi.registry.RegistryImpl.lookup(RegistryImpl.java:134)
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:409)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:267)
at sun.rmi.transport.Transport$1.run(Transport.java:177)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:273)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:251)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:377)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Naming.java:101)
at rmiclient.main(rmiclient.java:16)
Exception in thread "main" java.lang.NullPointerException
at rmiclient.main(rmiclient.java:21)



Thanks for any effort, probably many might have experienced the same I hope.

[Jo Jake]

Anybody who have worked in RMI here to help me ?

[Edward Harned]

It's hard to look at someones code and figure out what is wrong. It's like looking at a misspelled word.

Probable you haven't exported the remote object. The following is from a test program I use.

try {
      // make me an RMI Server on passed port 
      cb = (InterruptionReady)UnicastRemoteObject.exportObject(impl, port);

    } // end-try
    catch (java.rmi.RemoteException e) {

Now you bind/rebind the object "cb".