EJB injection returns null

[h.haveman]

Hello,

I am trying to use inject a stateless bean in a managed bean in a jsf web application.
However the EJB bean is null. If I try to do the same thing using jndi lookup the result is also an NULL object.

If I try to lookup the bean in a client application everything works fine.

In am using Jboss AS 5.1.0.GA

The code of the managed bean is :

package mx.bean;

import java.util.List;

import javax.ejb.EJB;
import javax.naming.Binding;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import mx.business.land.LandLocal;
import mx.business.land.LandRemote;
import mx.model.Land;

public class LandBean {

 private static final Log LOG = LogFactory.getLog(LandBean.class);

 @EJB(name = "ear/LandBean/remote", mappedName = "ear/LandBean/remote")
 private LandRemote landHandler;

 private List<Land> landen;

 public LandBean() throws NamingException {
 LOG.info("LandBean");
 if (landen == null) {
 LOG.info("LandBean landen is null");
 }
 Context context = new InitialContext();
 landHandler = (LandRemote) context.lookup("ear/LandBean/remote");
 if (landen == null) {
 LOG.info("LandBean landen is nog steeds null");
 }
 }


 /**
 * @param landen the landen to set
 */
 public void setLanden(List<Land> landen) {
 this.landen = landen;
 }

 /**
 * @return the landen
 */
 public List<Land> getLanden() {
 if (landen == null) {
 LOG.info("Landen is null");
 } else {
 landen = landHandler.getAll();
 }
 return landen;
 }



}

The logging shows :


22:55:57,757 INFO [LandBean] LandBean
22:55:57,757 INFO [LandBean] LandBean landen is null
22:55:57,776 INFO [LandBean] LandBean landen is nog steeds null
22:55:57,779 INFO [LandBean] Landen is null

Could anybody tell me what I am doing wrong? Or is injection not possible in a JSF web application?

Thanks,


Henk

[jamesjoh]

Shouldn't

if (landen == null) {
 LOG.info("LandBean landen is null");
 }

be

if (landHandler == null) {
 LOG.info("LandBean landen is null");
 }

Not sure if it's just a transcription error but your code posted to the forum is checking if the uninitialized List is null.

That said, I'm not sure if Injection works into a managed bean.

[h.haveman]

Thanks,

that did the trick. That's code completion in an IDE for you, without looking closely which variable to pick. I can now access the session bean using jndi lookup, however injecting the bean using the @EJB annotaion still results in a NULL object. But at least I can use the bean now.

Henk

[meetoblivion]

LandBean itself is not a managed object. @EJB injection only works on managed objects, JSF components, servlets, and EJBs.

[meetoblivion]

ah sorry i read it wrong.

can you provide some of the configuration on the Remote? and the implementation? either deployment desc or annotations?

[h.haveman]

The injected bean is a stateless session bean. This bean is deployed as a part of an ear.
When I perform a jndi lookup in jmx-console I can see it is there. Also when deploying the ear
I can see messages of the bean being added to jndi.

00:15:52,472 INFO [JndiSessionRegistrarBase] Binding the following Entries in Global JNDI:

 ear/LandBean/remote - EJB3.x Default Remote Business Interface
 ear/LandBean/remote-mx.business.land.LandRemote - EJB3.x Remote Business Interface
 ear/LandBean/local - EJB3.x Default Local Business Interface
 ear/LandBean/local-mx.business.land.LandLocal - EJB3.x Local Business Interface

The code of the bean is

package mx.business.land;

import java.util.List;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

import mx.model.Land;

@Stateless
public class LandBean implements LandLocal, LandRemote {

 @PersistenceContext(unitName = "mx")
 private EntityManager em;

 @SuppressWarnings("unchecked")
 public List<Land> getAll() {
 Query query = em.createQuery("from Land");
 List<Land> rtrn = query.getResultList();
 return rtrn;
 }

 public Land getById(String pCode) {
 Land rtrn = em.find(Land.class, pCode);
 return rtrn;
 }

}

Everything works fine if I do a jndi lookup, but using injection with the @EJB annotation gives me a null object. In my code I now check if the injection succeeded. If not I use jndi lookup. This works for me, but it would be much nicer if injection always succeeded.

Henk

[meetoblivion]

unless you have an ejb-jar that's overriding it, remove the name attribute in your client.

e.g.

@EJB(mappedName = "ear/LandBean/remote")
private LandRemote landHandler;

[h.haveman]

I tried it, but it makes no difference. The bean is still null.

[jaikiran]

You probably are not using the 2.5 xsd version in your web.xml. You need this:

<web-app version="2.5"
 xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

[h.haveman]

I am using the 2.5 xsd in my web.xml, so that's not causing it.