EJB Annotation does not work in AbstractServlet

[Maxime Thieu <ma...@gmail.com>]

Hello,

I am using OpenEJB 3.1 in Tomcat.

I use the Annotation @EJB in my Servlet in order to obtain my EJB and it
works well.

But If I use the Annotation @EJB in an abstract Servlet (which is the
superclass of all my Servlets), it does'nt work : it seams that the EJB
Annotation is not "interpreted" by openEJB.

Is this normal ? Is there any way for referencing EJB in abstract Servlet ?

Thanks in advance,

Maxime

Example :

public abstract class AbstractTestServlet extends HttpServlet {
    
    @EJB
    protected MyEJB myEJB;
    
    protected void testEJB() {
        myEJB.test();
    }

}

public class TestServlet extends AbstractTestServlet {
    
    @EJB
    protected MyEJB myEJB2;
    
   ...

   protected void testMyEJB() {
        myEJB2.test(); // this works
        testEJB(); // this doesn't work : NPE
        myEJB.test(); // this doesn't work : NPE (myEJB is null)
    }

}

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Re: EJB Annotation does not work in AbstractServlet

[Maxime Thieu <ma...@gmail.com>]

Thanks for your response and for opening this Jira.

It will be great to have this feature. Actually, my abstract Servlet have an
abstract method wich return an EJB, and all my other servlets (extending the
abstract servlet) define an EJB just for returning it to the super class ...

Any idea of what version of OpenEJB should have this feature ?

Maxime


David Blevins wrote:
> 
> 
> On Dec 19, 2008, at 1:03 AM, Maxime Thieu wrote:
> 
>>
>> Hello,
>>
>> I am using OpenEJB 3.1 in Tomcat.
>>
>> I use the Annotation @EJB in my Servlet in order to obtain my EJB  
>> and it
>> works well.
>>
>> But If I use the Annotation @EJB in an abstract Servlet (which is the
>> superclass of all my Servlets), it does'nt work : it seams that the  
>> EJB
>> Annotation is not "interpreted" by openEJB.
>>
>> Is this normal ? Is there any way for referencing EJB in abstract  
>> Servlet ?
> 
> We could get this to work, but we'd have to replace the annotation  
> processor in Tomcat.  That isn't really a big deal and would be an  
> easy feature to add.  We simply error on the conservative side when it  
> comes to replacing parts of Tomcat in the Tomcat/OpenEJB integration  
> (we want Tomcat to still feel like Tomcat), usually holding off till  
> someone requests a feature that requires it.  This would be one of  
> those features.
> 
> The Tomcat annotation processor is pretty decent in that it looks for  
> the basic annotations then blindly looks up from JNDI and injects what  
> it finds -- this allows us to expand it to support things that Tomcat  
> doesn't normally support.  But there two things it will not do: look  
> for annotations in super classes (as you notice); do xml-only injection.
> 
> Added a jira for it:
> 
>   https://issues.apache.org/jira/browse/OPENEJB-979
> 
> -David
> 
> 
> 

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Re: EJB Annotation does not work in AbstractServlet

[David Blevins <da...@visi.com>]

On Dec 19, 2008, at 1:03 AM, Maxime Thieu wrote:

>
> Hello,
>
> I am using OpenEJB 3.1 in Tomcat.
>
> I use the Annotation @EJB in my Servlet in order to obtain my EJB  
> and it
> works well.
>
> But If I use the Annotation @EJB in an abstract Servlet (which is the
> superclass of all my Servlets), it does'nt work : it seams that the  
> EJB
> Annotation is not "interpreted" by openEJB.
>
> Is this normal ? Is there any way for referencing EJB in abstract  
> Servlet ?

We could get this to work, but we'd have to replace the annotation  
processor in Tomcat.  That isn't really a big deal and would be an  
easy feature to add.  We simply error on the conservative side when it  
comes to replacing parts of Tomcat in the Tomcat/OpenEJB integration  
(we want Tomcat to still feel like Tomcat), usually holding off till  
someone requests a feature that requires it.  This would be one of  
those features.

The Tomcat annotation processor is pretty decent in that it looks for  
the basic annotations then blindly looks up from JNDI and injects what  
it finds -- this allows us to expand it to support things that Tomcat  
doesn't normally support.  But there two things it will not do: look  
for annotations in super classes (as you notice); do xml-only injection.

Added a jira for it:

  https://issues.apache.org/jira/browse/OPENEJB-979

-David