@Resource For A Non-EJB

[Mark Garland]

Hi all,

I have written a standard Java class (not an EJB) which I have packaged as a JAR within an EAR. This Java Class will put things on a queue when requested.

Rather than perform a manual JNDI lookup for the Queue and Connection Factory, I used the @Resource annotation, and assumed that because it was within a Container (GlassFish) that this would work.
I am pretty confident that the annotation/queue/connectionfactory is set up correctly because the deployment through NetBeans fails otherwise.
However, I keep getting a NullPointerException when the code is executed, so the @Resource annotation isn't working.

Does the @Resource annotation only work in EJBs? Or is this a GlassFish quirk?

Thanks,

MG

[Jaikiran Pai]

Mark Garland wrote:
Does the @Resource annotation only work in EJBs? Or is this a GlassFish quirk?

@Resource and other similar EE injection constructs work only with managed classes like servlets, EJBs, managed beans etc. They won't work with plain Java classes.

[Mark Garland]

Hi Jaikiran,

Thanks for your quick and accurate reply.

I've removed the @Resource annotations and put in a manual JNDI lookup, and all is working great - thanks!

The @Resource annotation not working in a POJO which is sat in a container feels a bit of a shame if honest. A lot of the annotations are great for reducing repeating boilerplate code, yet I'd be forced to convert my POJOs to EJBs if I wanted to use them even though the container is capable. Just feels like a missed opportunity to me.

Thanks once again for your help - much appreciated.

MG

[Jaikiran Pai]

Mark Garland wrote: A lot of the annotations are great for reducing repeating boilerplate code, yet I'd be forced to convert my POJOs to EJBs if I wanted to use them even though the container is capable. Just feels like a missed opportunity to me.

Java EE6 introduces Managed Beans which plugs this gap. A Managed Bean is a POJO which can have injection, lifecycle callbacks and interceptors. It however doesn't have any transactional, security related semantics unlike EJBs - which is understandable.

[Jayavardhan geepi]

Hi,

I tried to use resource injection in a servlet with name parameter set to jndi name (which works in manual look up) in JBoss 4.2.x.x.

It is not working. Properties are null at run time.