问如何验证HQL在语法上是否正确(不执行它)？

EN

Session sess = factory.openSession();
Transaction tx;

try {
    tx = sess.beginTransaction();
    //execute the hql. will throw an error if not a valid one
    //...

    //commit if hql is not malformed
    tx.commit();
}
catch (Exception e) {
    if (tx!=null) tx.rollback(); //hql not valid. rollback
    throw e;
}
finally {
    sess.close();
}

public static void main(String args[]) {
    EntityManagerFactory emf = Persistence.createEntityManagerFactory("JPA");
    EntityManager em = emf.createEntityManager();
    em.getTransaction().begin();
    em.getTransaction().commit();
    em.close();
    emf.close();
}