@EJB injection

Question

Hi,
I've seen this asked before, but there was never enough information, so I'm going to ask this again.
I am trying a simple test with WebLogic 10.0 MP1.
I have created an EAR file with 3 modules inside:
1. A JAR file containing a stateless EJB.
2. A WAR file containing a POJO webservice (using the @WebService annotation).
3. A WAR file containing a servlet.
The EJB code:
public interface IHelloWorld
     public void hello();
import javax.ejb.Local;
import javax.ejb.Remote;
import javax.ejb.Stateless;
@Stateless
@Local( IHelloWorld.class )
@Remote( IHelloWorld.class )
public class HelloWorld implements IHelloWorld
     public void hello()
          System.out.println( "Hello EJB3!" );
The EJB seems to deploy fine, and I can see it in the JNDI tree, and also in the console.
Also, I can reach the web-service and the servlet just fine.
Now, I've added the following member to both the servlet and the web service:
     @EJB
     private IHelloWorld helloWorld;
And in the activated method (service in the servlet, and the method on the web-service) I've added the following code:
          if ( helloWorld != null )
               helloWorld.hello();
          else
               System.out.println( "helloWorld is null. Bah." );
I'm always getting that helloWorld is null, meaning the injection was not performed by the server.
I am not using any deployment descriptors aside from application.xml in the EAR file, and the generated files in the created WAR file for the web-service (used jwsc ant to create the web-service).
Any ideas?
-- Nimrod

Answer 1

Well, I solved it myself.
Apparently, in order for EJB injection to work in a servlet / webservice, WebLogic server needs to know that the web application is using version 2.5 of the servlet API. To do this, replace your web-app directive in your web.xml with this:
<web-app id="test" 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/web-app_2_5.xsd">
Now EJB injection works.