problems with hibernate custom validators

[kosl]

Dear all,

I'm trying to write a custom validator as described http://www.hibernate.org/hib_docs/validator/reference/en/html/validator-defineconstraints.html#validator-defineconstraints-own

The validator is intended for use with new users registering and he has to check whether the login given by user is still available. Therefore I need to connect with the data layer to execute a finder on users. Is there any simple way of doing that?

@PersistenceContext
private EntityManager em;

doesn't help since validator aint a bean.

Thanks in advance for any help,

Kind Regards,

karol