JBoss5.1 EJB3 JSF1.2 integration problem

[Tudor Raneti]

I'm following simple examples like this one:
http://gochev.blogspot.com/2009/10/javaee-5-jsf-jpa-ejb3-using-eclipse.html

But i can't get the stateless bean from the EJB module i've successfully deployed on JBoss no matter what i try.
I get:

root cause
java.lang.NullPointerException

i tried with @EJB,
w/ and w/o @EJB mapped name,
w/ and w/o ejb-jar.xml and jboss.xml (which i doubt i configured properly anyway but the example don't say anything about them,
and with new InitialContext().lookup(...) too

at best i got a:
javax.naming.NamingException: Could not dereference object [Root exception is ja
va.lang.reflect.UndeclaredThrowableException]
at org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure(NamingC
ontext.java:1504)
...
when i probably managed to integrate it but run into another problem.

some example code:


The backing bean - from which i try to display something in a JSF/JSP page and can't:

package demo;

import javax.ejb.EJB;

import com.manning.jbia.GreeterBean;

/**
 * Created by JBoss Developer Studio
 */
public class User {

	@EJB private GreeterBean greeterBean;
	private String greeting;
	private String name;

	/**
	 * @return User Name
	 */
	public String getName() {
		return name;
	}

	/**
	 * @param User Name
	 */
	public void setName(String name) {
		this.name = name;
	}

	public String getGreeting() {
		return greeterBean.getAllGreetings().get(0).getGreeting();
	}

	public void setGreeting(String greeting) {
		this.greeting = greeting;
	}
}

The interface

package com.manning.jbia;

import java.util.List;
import javax.ejb.Remote;

@Remote
public interface Greeter {
	public void greet(String message);

	public List<Greeting> getAllGreetings();
}

The bean

package com.manning.jbia;

import java.util.List;
import javax.ejb.Stateless;
import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;

@Stateless
public class GreeterBean implements Greeter {
	@PersistenceContext
	private EntityManager em;

	public void greet(String message) {
		Greeting greeting = new Greeting(message);
		em.persist(greeting);
	}

	public List<Greeting> getAllGreetings() {

		Greeter greeter = null;
		try {
			InitialContext ctx = new InitialContext();
			greeter = (Greeter) ctx.lookup("GreeterBean/remote");
		} catch (NamingException e) {
			e.printStackTrace();
		}
		greeter.greet("Hello, world!");
		return em.createQuery("from Greeting").getResultList();
	}
}

The entity

package com.manning.jbia;

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;


@Entity
public class Greeting implements Serializable {
	
	private Integer id;
	private String message;

	public Greeting() {
		
	}

	public Greeting(String message) {
		this.message = message;
	}

	@Id
	@GeneratedValue
	public Integer getId() {
		return id;
	}

	public String getGreeting() {
		return message;
	}

	private void setId(Integer id) {
		this.id = id;
	}

	private void setGreeting(String message) {
		this.message = message;
	}
}

[Deriko Prata]

Hi there, to get a reference to the same ejb, use sessionContext.getBusinessObject(Greeter.class)(inject sessionContext with @Resource) instead of doing InitialContext ctx = new InitialContext(); greeter = (Greeter) ctx.lookup("GreeterBean/remote");

If it still doesn´t work, please put the full stack trace

[Tudor Raneti]

Hello, sorry I've been out during weekend for I have no internet at home momentarily.

Injecting a @Resource would probably work on JBoss as it is one of the solutions I also read about (i will give it a try and update when i test it on JBoss - although i have doubts, since @Resource injection is in the same category as @EJB)

I will describe the solution I found, although JBoss complains about it.
(I will update here with the WARN message after I apply the solution)

The situation was that when i try to inject using @EJB annotation, JBoss gives ERROR:
Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: Resolution should not happen via injection container

But when i get the context like this in User.java:

Note i added getInitialContext() and commented out the @EJB injection

/*******************************************************************************
 * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is made available under the terms of the
 * Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Exadel, Inc. and Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package demo;

import java.util.Properties;

import javax.ejb.EJB;
import javax.ejb.SessionContext;
import javax.naming.Context;
import javax.naming.NamingException;

import com.manning.jbia.Greeter;
import com.manning.jbia.GreeterBean;


/**
 * Created by JBoss Developer Studio
 */
public class User {

//	@EJB private GreeterBean greeterBean;
	private String greeting;
	private String name;

	/**
	 * @return User Name
	 */
	public String getName() {
		return name;
	}

	/**
	 * @param User
	 *            Name
	 */
	public void setName(String name) {
		this.name = name;
		
	}

	public String getGreeting() {
		String greeting = null;
		Context context = null;
		try {
			context = getInitialContext();
			greeting =  ((Greeter) context.lookup("GreeterBean/remote")).getAllGreetings().get(0).getGreeting();
		} catch (NamingException e) {
			e.printStackTrace();
		}
		return greeting;
	}

	public void setGreeting(String greeting) {
		this.greeting = greeting;
	}

	public static Context getInitialContext()
			throws javax.naming.NamingException {

		Properties p = new Properties();
		p.put(Context.INITIAL_CONTEXT_FACTORY,
				"org.jnp.interfaces.NamingContextFactory");
		p.put(Context.URL_PKG_PREFIXES, " org.jboss.naming:org.jnp.interfaces");
		p.put(Context.PROVIDER_URL, "jnp://localhost:1099");
		return new javax.naming.InitialContext(p);
	}

}

It works, although in this JBoss instalation / example it also gives a bizarre error that doesn't seem to affect anything:

[STDERR] javax.naming.NameNotFoundException: GreeterBean not bound

[Tudor Raneti]

I found the problem.
Deployed and exploded EAR directory names mustn't end in .ear (Eclipse was deploying like that) - as soon as i renamed w/o the .ear it started working.

I'll leave it unresolved for the problem with @EJB annotation that won't work

[Tudor Raneti]

Oops, double post

[Jaikiran Pai]

The NameNotFoundException is most likely because you are using the wrong JNDI name. While deploying as a .ear the (default) JNDI name of the bean is different from what you use when you deploy as a .jar. See this for more info.

I guess when you removed the .ear extension, it probably is considering it to be a .jar (which is a bit odd actually). Anyway, rename it back to .ear (if it indeed is a .ear file) and then change the lookup code to use the correct JNDI name.

[Tudor Raneti]

Thank you. This also fixed the @EJB "Resolution should not happen via injection

container" problem. Here it sais more:

http://stackoverflow.com/questions/3844453/resolution-should-not-happen-via-injection-container-error

I did go over that one bit of info but I didn't couple it with this:

private Context getInitialContext() {
		Properties p = new Properties();
		p.put("java.naming.factory.initial",
				"org.jnp.interfaces.NamingContextFactory");
		p.put("java.naming.factory.url.pkgs",
				" org.jboss.naming:org.jnp.interfaces");
		p.put("java.naming.provider.url", "jnp://localhost:1099");
		InitialContext initialContext = null;
		try {
			initialContext = new InitialContext(p);
		} catch (NamingException e) {
			e.printStackTrace();
		}
		return initialContext;
	}

which can actually sit in the the

EAR_project_name.ear/EJB_project_name.jar/META-INF/jndi.properties, while the

WAR_project_name.war references the EJB_project_name.jar (Eclipse -> build path

->projects -> add)



... which isn't actually needed because JBoss provides it by default ...
Glad it's finally sorted out.