UsuarioFacade.java

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package com.pepe.jpa.sesions;

import com.pepe.jpa.entities.Usuario;
import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.NoResultException;
import javax.persistence.NonUniqueResultException;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;

/**
 *
 * @author ADSI TARDE
 */
@Stateless
public class UsuarioFacade extends AbstractFacade<Usuario> {
    @PersistenceContext(unitName = "pepeAplicacionPU")
    private EntityManager em;

    @Override
    protected EntityManager getEntityManager() {
        return em;
    }

    public UsuarioFacade() {
        super(Usuario.class);
    }
    
    
    public Usuario findByDocumento(String numero_documento) {
        Query q = getEntityManager().createNamedQuery("Usuario.findByNumeroDocumento");
        q.setParameter("numeroDocumento", numero_documento);
        try {
            return (Usuario) q.getSingleResult();
        } catch (NonUniqueResultException ex) {
            throw ex;
        } catch (NoResultException ex) {
            return null;
        }
    }
    
}