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From David Blevins <>
Subject Re: JPA and JNDI
Date Tue, 19 Aug 2008 22:31:02 GMT

On Aug 19, 2008, at 3:06 PM, ericp56 wrote:

>>> @PersistenceContext(unitName = "ctimssql")
>>> EntityManager em;
>> dumb question... this annotated field is in an ejb class?
> Whoops!  I moved this code to another class.  However, adding the @EJB
> annotation didn't help.  I'm sorry, but I'm still learning a lot of  
> this.
> Am I missing something elementary?

@EJB is the annotation used for getting an EJB injected into your EJB,  
Servlet, etc.  To make something an EJB one of the two have to happen:

  a. must be annotated with @Stateless, @Stateful, or @MessageDriven
  b. must be declared via an <session> or <message-driven-bean>  
(subelements <ejb-name> and <ejb-class> are required)

We will search for annotations in the bean class of your session bean  
or message-driven bean.  Only the bean class and its parent classes  
are searched for injection related annotations (@Resource, @EJB,  
@PersistenceContext, @PersistenceUnit), interfaces and any other  
classes are not searched.

When the container instantiates a bean class, the container does  
injection, when this happens is different for each bean type.  If you  
instantiate your bean class via "new MyBean()", no injection.

Here's a good example of all the moving parts:

If you still need a bit more help, post your bean code (can leave the  
methods off) and your ejb-jar.xml (if you have one).


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