Error in running EJB client code

[Rr Ram]

Hi,

My requirement is just to run this code with error free which is needed for our application. Server we were using Websphere6.1.

For runnng this client program we had include the following jars
bootstrap.jar
ecutils.jar
ffdc.jar
ibmorb.jar
idl.jar
iwsorb.jar
j2ee.jar
myClient.class
myClient.java
naming.jar
namingclient.jar
ras.jar
SonoraBeans.jar
tx.jar
txClient.jar
txClientPrivate.jar
utils.jar
wsexception.jar

This is our ejb client code.

 package com.example;
import java.util.Properties;
import com.eistream.sonora.query.QuerySessionEJB;
import com.eistream.sonora.query.QuerySessionEJBHome;
import javax.naming.Context;
import javax.ejb.EJBHome;
public class myClient
{
	public static void main(String args[])
	{
		System.out.println("Starting...");
		try
		{
			Properties env = new Properties();
			env.put(Context.SECURITY_PRINCIPAL, "UserName");
			env.put(Context.SECURITY_CREDENTIALS, "password");
			env.put(Context.PROVIDER_URL, "iiop://localhost:2810");
			env.put(Context.INITIAL_CONTEXT_FACTORY,
			"com.ibm.websphere.naming.WsnInitialContextFactory");
			System.out.println("instantiating inital context");
			javax.naming.InitialContext ic = new javax.naming.InitialContext(env);
			System.out.println("instantiating ejb home");
			QuerySessionEJBHome myQueryHome = (QuerySessionEJBHome) ic.lookup("com.eistream.sonora.query.QuerySessionEJBHome");
			System.out.println("instantiating ejb session");
			QuerySessionEJB myQuerySessionEJB = myQueryHome.create(); //error line
			System.out.println("Finished!");
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}
}
   

we were pointing to IBM jre to run the above code.

While running up the code we ended up with the following exception

May 29, 2009 12:50:32 PM com.ibm.ws.naming.util.Helpers
WARNING: jndiNamingException
javax.naming.NamingException: Error during resolve [Root exception is java.lang.NullPointerException]
at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1939)
at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1862)
at com.ibm.ws.naming.jndicos.CNContextImpl.lookupExt(CNContextImpl.java:1552)
at com.ibm.ws.naming.jndicos.CNContextImpl.lookup(CNContextImpl.java:1354)
at com.ibm.ws.naming.util.WsnInitCtx.lookup(WsnInitCtx.java:172)
at javax.naming.InitialContext.lookup(InitialContext.java:363)
at com.example.myClient.main(myClient.java:23)
Caused by: java.lang.NullPointerException
at com.ibm.ws.security.auth.ContextManagerImpl.login(ContextManagerImpl.java:3233)
at com.ibm.ws.security.auth.ContextManagerImpl.login(ContextManagerImpl.java:3225)
at com.ibm.ws.security.auth.ContextManagerImpl.login(ContextManagerImpl.java:3014)
at com.ibm.ws.naming.jndicos.CNContextImpl$1.run(CNContextImpl.java:5072)
at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:118)
at com.ibm.ws.naming.jndicos.CNContextImpl.login(CNContextImpl.java:5067)
at com.ibm.ws.naming.jndicos.CNContextImpl.cosResolve(CNContextImpl.java:4334)
at com.ibm.ws.naming.jndicos.CNContextImpl.doLookup(CNContextImpl.java:1901)

Note : JNDI lookup name is correct, since the same code is working up in our client side, we assuming we were missing up of some jars or wrong jars may leads to this problem

Any clarification/suggestions will be welcomed.

Thanks in Advance

[Mateus Lucio]

Hi there, I have got little knowledge on EJB but I recommend you to start with this warning:

May 29, 2009 12:50:32 PM com.ibm.ws.naming.util.Helpers
WARNING: jndiNamingException

That is your lookup code

QuerySessionEJBHome myQueryHome = (QuerySessionEJBHome) ic.lookup("com.eistream.sonora.query.QuerySessionEJBHome");  

I usually do it like this

Object obj = ic.lookup("EARName/" + "com.eistream.sonora.query.QuerySessionEJBHome" + "/" + "Local or Remote");

EARName is optional, only applies if you're looking up an EJB that's inside an EAR file.

I'm using EJB 3, I have never worked with EJB 2.1 ... hope it helps you!

[Prannav Santhosh]

Hi,
In case of EJB 3 , client access the bean using the Depedency Injection (using the @EJB annotaiton). Can you explain to me how this work with the remote lookup ?

For example :
My ejb is deployed in Machine A
My client is in Machine B. If i use @EJB annotation in in my client code , how does my client get reference to the Remote bean ?


Regards,
Prannav.

[Mateus Lucio]

Hi, as far as I know the @EJB annotation only works for Local injection, if your client code is running outside the EJB Container which the Bean you are trying to lookup is deployed, the injection will fail ... see, you still have to provide the server location to make a bean lookup and unless you can configure it directly in @EJB annotation I can't imagine how it would work.

[Prannav Santhosh]

Thanks for your help.