javahibernatespringormquery-by-example

HibernateTemplate findByExample returns no results

I'm trying to use Hibernate QBE (actually, Spring's HibernateTemplate.findByExample() ) to return a list of users by their username. I use a "known good" value to search on (the username "JOHN.SMITH" does exist in the database).

Unfortunately, I get no results back. Below is the unit test.

@Test
public void testQueryByExample() {

    User qbeUser = new User();
    qbeUser.setUsername("JOHN.SMITH");

    List<User> userList = userDao.queryByExample(qbeUser);
    Assert.notNull(userList);
    Assert.isTrue(userList.size() > 0, "List of returned users must not be 0");

}

The queryByExample() method is defined in a generic DAO:

@SuppressWarnings("unchecked")
public List<T> queryByExample(T obj) {
    return getHibernateTemplate().findByExample(obj);
}

Is there any sort of special configuration needed for QBE to work?

Solution

  • It was pure stupidity on my part.

    The classes being used as examples had some ints and booleans (primitives) in them. Since those values default to 0 and false, the queries were failing.