NamedQuery defined in DAO annotation not found by Hibernate session factory

Question

I use Spring along with Hibernate. In my DAO, I defined a NamedQuery which is not found by the session factory, although I have added the package of that DAO to the packagesToScan.

My DAO:

/**
 * 
 */
package org.lalala.service.mytest;

import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;

import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;


import  org.lalala.objects.Unit;


@NamedQueries
({
    @NamedQuery
    (
        name="unit.findById",
        query="from Unit u where u.unitid = :unitId"
    )
})
public class MyTestDaoImpl implements MyTestDao
{

    private SessionFactory sessionFactory;


    public MyTestDaoImpl(SessionFactory sessionFactory)
    {
        super();
        this.sessionFactory = sessionFactory;
    }



    /* (non-Javadoc)
     * @see org.lalala.service.mytest.MyTestDao#getRandomUnit()
     */
    @Override
    public Unit getRandomUnit()
    {
        long unitid = 2891;
        try {
            Session session = sessionFactory.getCurrentSession();
            session.beginTransaction();

            Query query = session.getNamedQuery("unit.findById");
            query.setParameter("unitId", unitid);

            Unit unit = (Unit) query.uniqueResult();

            session.getTransaction().commit();

            return unit;
        } catch (Exception e) {
            System.out.println(e.getMessage());
            return null;
        }
    }    

}

And here the Spring config method for providing a session factory:

@Bean
public AnnotationSessionFactoryBean  getSessionFactory() {
    final AnnotationSessionFactoryBean  sessionFactory = new  AnnotationSessionFactoryBean ();
    sessionFactory.setDataSource(getDataSource());

    String[] packages = new String[]{"org.lalala.avalon.service.mytest"};

    sessionFactory.setAnnotatedPackages(packages);

    Properties properties = new Properties();
    properties.put("hibernate.current_session_context_class", "thread");
    sessionFactory.setHibernateProperties(properties);

    return sessionFactory;
}

And here the exception which is thrown:

org.hibernate.MappingException: Named query not known: unit.findById

Because of some similar stackoverflow questions, I replaced the hibernate @NamedQuery annotation with JPA equivalent. Did not help.

Answer 1

you have to put the named queries on your entity, not on the dao

here is an example

Answer 2

If you annotate your DAO with @MappedSuperclass then you can put your NamedQueries in the DAO. Don't forget to add the package of the DAO or the DAO-class itself to the list of annotated packages/classes.