Hibernate 5.2 version -> A lot of Query methods deprecate?

Question

I'm new to Hibernate.

I'm trying to get a list of first name and last name of all administrators.

There are two warnings in my following code. I already tried to search a lot online.

1) Query is a raw type. References to generic type Query should be parameterized.

2) The method list() from the type Query is deprecated.

public List<Object> loadAllAdmins() {
                List<Object> allAdmins = new ArrayList<Object>();
                try {
                        HibernateUtil.beginTransaction();

                        Query q = currentSession.createQuery("SELECT admin.firstName, admin.lastName from AdminBean admin");

                        allAdmins= q.list();

                        HibernateUtil.commitTransaction();
                } catch (HibernateException ex) {
                        System.out.println("List<AdminBean> loadAllPersons: HibernateException");
                }
                return allAdmins;
        }

But I see sample code like this all over the web. How should I solve these two problems?

Update

I just tried to use Criteria as suggested. It also says the list() method is deprecate for Criteria... It seems that a lot of methods are deprecate for both Query and Criteria, including uniqueResult() and others... Any suggestion how I should replace them?

Solution 1

public List<Admin> getAdmins() {
    List<Admin> AdminList = new ArrayList<Admin>(); 
    Session session = factory.openSession();
    for (Object oneObject : session.createQuery("FROM Admin").getResultList()) {
        AdminList.add((Admin)oneObject);
    }
    session.close();
    return AdminList;
}

The warnings came from "Type Inference".

I had the similar problem. However, I found a solution without "SuppressWarnings".

---

Recently, I found out a shorter way to code the same things without type inference.

public List<Admin> getAdmins() {
    Session session = factory.openSession();
    TypedQuery<Admin> query = session.createQuery("FROM Admin");
    List<Admin> result = query.getResultList();
    session.close();
    return result;
}

Hope it helps.

Solution 2

Don't import QUERY from org.hibernate (As its Deprecated now). Instead import from “org.hibernate.query” .Eclipse reference

Solution 3

I tested other methods of hibernate javadoc and i came up with getResultList() method of the TypedQuery<T> interface. Example:

public List<Admin> getAdmins() {
  Session session = factory.openSession();
  @SuppressWarnings("unchecked")
  List<Admin> result = session.createQuery("FROM Admin").getResultList();
  session.close();
  return result;
}

The difference is that the returned type of createQuery is not Query but a subinterface called TypedQuery<T>. Because it is typed, it also fixes the "Query is a raw type" warning.

With this solution you may get a Type Safety warning, which can be solved by either casting each object explicitly or by adding @SuppressWarnings("unchecked")

Regarding criterias see hibernate user guide

Nevertheless, i am wondering why the tutorials-page of hibernate is not adjusted.

Comments

[Xdg]

Maybe inspect given class in JavaDoc, there can be a suggestion - docs.jboss.org/hibernate/orm/5.2/javadocs/org/hibernate/quer‌​y/… .

[Chenya Zhang]

Yes, I just tried. It also says the list() method is deprecate for Criteria as well... It seems that "all methods" are deprecate for both Query and Criteria, including uniqueResult() and others... I don't know why this could ever happen. I did exactly the same thing as all online tutorials.

[Emiliano Dueñas]

This method is too deprecated!

[Johannes H]

This seems to be the same procedure as stated in my answer with the exception of an explicit cast isn't it ? Isn't it a runtime disadavantage to cast each object explicity (see stackoverflow.com/questions/2170872/…) ?

[Pika]

1. No. As I stated, The suppress warning is removed. 2. Yes, but I think it would be worth. It's usually worth trying to work out a way of avoiding the warning rather than suppressing it.

[Menai Ala Eddine - Aladdin]

createCriteria() is @Deprecated in Hibernate 5.2.

[Menai Ala Eddine - Aladdin]

createQuery() is not deprecated and getResultList() is not deprecated.see docs.jboss.org/hibernate/orm/5.2/javadocs/org/hibernate/quer‌​y/….