What does JPA EntityManager.getSingleResult() return for a COUNT query?

Question

What does EntityManager.getSingleResult() return for a COUNT query?

So.. what is the precise runtime type of foo?

Object foo = em.createQuer         


        

Answer 1

return query.getSingleResult() != null ? Integer.parseInt(query.getSingleResult().toString()) : 0;

Second call query.getSingleResult() will throw org.hibernate.SessionException: Session is closed!

To avoid the org.hibernate.SessionException: Session is closed! use as below

Object obj = query.getSingleResult();
    if (obj != null) {
        Integer result = Integer.parseInt(obj.toString());
        return result;
    }

    return Integer.valueOf(0);