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535

answers:

2
Q: 

Using Dependency Injection in POJO's to inject EJB's

Is it possible to inject ejb's into pojo's using the @EJB annotation? If it is, do I have to set up anything special on a JBoss server to make it work?

Please let us not discuss the rationale behind doing this - I am just trying to hack some old code to make it work :-)

+1  A: 

Yes, if you can make JBoss create the Pojo for you.

Your problem is that you probably call new to create the Pojo and the framework can't intercept this which is why @EJB is ignored.

The solution is to use a factory to create your Pojos and tell the factory about the EJBs, so it can set them before returning the new Pojo.

Aaron Digulla  2009-10-30 10:14:32
You mean a regular factory pattern created as a bean, right? Factories are not a specific part of the JBoss?!
homaxto  2009-11-02 08:21:03
I refer to the Gang of Four pattern: http://en.wikipedia.org/wiki/Factory_pattern
Aaron Digulla  2009-11-02 08:57:49
If I use the factory to set the EJB's then I don't use the @EJB, or do I misunderstand something?
homaxto  2009-11-02 11:03:22
@Aaron Digulla: Any chance you could provide an example of this?
Tom Tresansky  2010-06-16 12:53:46
@Tom Tresansky: My answer should be pretty obvious. If you have a specific question, please post a new question. If you don't understand my answer, then please read up on dependency injection and how @EJB is implemented (you should find an explanation in the docs of your app server or ask the support).
Aaron Digulla  2010-06-16 15:08:17
A: 

Not sure, but EJB 3.1 should allow this.

Ondra Žižka  2009-11-01 04:22:32

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