SEAM: How to get EntityManager and Logger in a class that is loaded dynamically?

Question

Hi,

I have a background service that runs every 10 min.

This service queries the DB for jobs to execute a will load a class with a different business logic according to the job (using Class.forName()). They implement the same Interface, of course.

I declared those classes to be SEAM components but when I try to use the entityManager or Logger I get a NPE.

Answering my own question, I suppose this is because Class.forName() goes under SEAM's injection mechanism and it won't have a chance to inject the dependencies.

I could probably work around that by injecting those myself, after I load the class. Is there a better way to do that?

Thanks!

Answer 1

Did you check how to use EJB-Timer Service?

Another resource:

http://stackoverflow.com/questions/2070262/is-it-possible-to-use-seam-in-a-jboss-timed-service

I have to do something similar in a few days.

Please leave a comment what worked for you ;-)

Answer 2

You can inject all Seam components in non seam classes by using

Component.getInstance("entityManager") //You can inject whatever you want.

To get the Logger working you can do the following

 private static final LogProvider log = Logging.getLogProvider(MyClass.class);