Are @EntityListeners with injection possible?

[craig]

Hi i have an @EntityListener on an entity that listens to PrePersist events.  The method gets called fine however, done of my injected properties are set. 

I can get one by doing

Account account = (Account) Contexts.getSessionContext().get("account");

but how do i get my entityManager?

Thanks

Craig

[keithnaas]

Craig,

Don't do annotation based injection in an EntityListener.  Last time I checked, the lifecycle of the object is not controlled by Seam. 

Try

Component.getInstance("entityManager");//where entityManager is the name of the entityManager in your components.xml

[craig]

Thats great works well.

Is this a good design pattern or should i be using seams event model and raising prePersist events?

I dont want to use the prePersist annotation in my entity as i need to access the db for get a specific value at point of persist.

Thanks

Craig

[keithnaas]

Hmmm...I suppose it depends on what kind of logic will be executing in prepersist.  If its simply a matter of putting some audit information somewhere...just use a prepersist.  But if you need to do something really crazy, I would probably look at using seam events.  Unfortunately, there's a million way to skin this cat.

[monkeyden]

Seam 2.0.3.CR1

I tried this with:

identity = (Identity)Component.getInstance("identity");

also tried the more verbose variety:

identity = (Identity)Component.getInstance("org.jboss.seam.security.identity");

and identity comes up null.  It does get into the method ok.  Any ideas?

[sean.tozer]

This is an old thread, but I came across it while looking for a solution, and wanted to post back how I eventually solved it.

Identity identity = (Identity)Component.getInstance(Identity.class);

works to manually inject the identity component, while the string identifier does not.