Sample java client not running--showing a strange error-- help urgently

Question

Hi,
I have followed all the steps, given in JDevloper help, to create and deploy an EJB onto a 9ias server and I have been successful in creating the EJB and deploying it from the JDevloper machine to 9ias machine.My JDevloper is on one machine and 9ias is on another. After deploying when I am creating a sample java client, as given in the JDevloper help file, it gives a very strange error
java.lang.NullPointerException
     void Samplemypackage1.MySessionEJB1Client.main(java.lang.String[])
Process exited with exit code 0.
I have tried a lot but it's not happening. Is it becuase
1. 9ias and JDevloper should be on the same machine
2. some configurational changes need to be done in the settings
3. jdk1.3.1 is not compatible with JDevloper.
I am enclosing the code snippet for your quick reference.
package Samplemypackage1;
import java.util.Hashtable;
//import javax.rmi.PortableRemoteObject;
import javax.naming.Context;
import javax.naming.InitialContext;
import mypackage1.MySessionEJB1;
import mypackage1.MySessionEJB1Home;
public class MySessionEJB1Client
public static void main(String [] args)
MySessionEJB1Client mySessionEJB1Client = new MySessionEJB1Client();
try
Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.SECURITY_PRINCIPAL, "admin");
env.put(Context.SECURITY_CREDENTIALS, "admin");
env.put(Context.PROVIDER_URL, "ormi://9ias:23791/MySessionEJB1");
Context ctx = new InitialContext(env);
MySessionEJB1Home mySessionEJB1Home = (MySessionEJB1Home)ctx.lookup("MySessionEJB1");
MySessionEJB1 mySessionEJB1;
// Use one of the create() methods below to create a new instance
mySessionEJB1 = mySessionEJB1Home.create();
// Call any of the Remote methods below to access the EJB
System.out.println(mySessionEJB1.calc("om sri"));
catch(NullPointerException ne)
ne.printStackTrace();
catch(Throwable ex)
ex.printStackTrace();
When I tried to debug the program I found that the line " mySessionEJB1 = mySessionEJB1Home.create()" returns a null. I really fail to understand as to why it is happening.
Please help me.
Thankx

Answer 1

That's strange. home.create() should never return a null.
Do you see any exception trace on the server side?
Do you have the same version of oc4j.jar on client and server machine? Which version of Jdeveloper and 9iAs are you using?
Try copying oc4j.jar from the server machine to client machine and use that to connect to the bean.
HTH
Dhiraj