Hibernate: check if object exists

org.hibernate.Session session = ...;
long id = 1;
A obj = session.load(A.class, id);

org.hibernate.Session session = ...;
long id = 1;
boolean exists = session.exists(A.class, id);
if(exists){
 // do smth.....
}

public Object get(Class clazz,
                  Serializable id)
           throws HibernateException

public Boolean exists (DTOAny instance) {
    Query query = getSession().
    createQuery("select 1 from DTOAny t where t.key = :key");
        query.setString("key", instance.getKey() );
    return (query.uniqueResult() != null);
}