Getting EntityManager in FacesValidator

[paul_]

Hope i'm not asking a question already answered (at least I couldn't find any)

I am writing a JEE 6 webapp with Seam 3.1, JSF 2 (Richfaces 4.1) running on JBoss 7.1 final.

For the past few hours I was trying to get an EntityManager injected into a FacesValidator like this:

@FacesValidator("ValidatorUsernameReg")

public class ValidatorUsernameReg implements Validator {

...

@PersistenceContext

private EntityManager em;

@Override

    public void validate(FacesContext arg0, UIComponent arg1, Object arg2)

            throws ValidatorException {

     em.createNativeQuery(...)

}

}

I need the EntityManager here to check if a username entered in a registration form already has been taken and then display a corresponding error message.

But, and that's my problem, the EntityManager always turns out null.

Is there a way other than creating a corresponding Session Bean which queries the database?

Is persistence-related stuff not allowed / not possible in JSF Validators?

Greetings from Germany,

pascal

[lightguard]

If you're using Seam Faces you can @Inject an EntityManager. People are typically doing a Seam Managed Persistence Context for this. Another way would be to @Inject another component which has the @PersistenceContext in it.

[paul_]

Yea, I ended up injecting another component that uses @PersistenceContext.

As far as I get it, one can't use @PersistenceContext in a validator because it isn't a bean managed by the container.

Anyhow, Thanks Jason for your reply.

Greetings from Germany

p.salg