Hibernate version: Hibernate 3.2.6

JDK version: 1.5

Code between sessionFactory.openSession() and session.close():
List<Message> messages = newSession.createQuery("from Message m order by m.text asc").list();

Eclipse 3.3 warning message:
Type safety: Expression of type List needs unchecked coversion to confirm to List<Message>


org.hibernate.Query.list() seems to return just a raw java.util.List object without using any generics. Does that mean I will have to use a lesser JDK version to compile my program?

Please advise!

Thanks,
How Do I!

No. Hibernate code is still compatible with earlier JDKs. You will not have this problem if you use its JPA implementation.


Farzad-

Thanks for the reply Farzad. Can you please elaborate. I am very new to Hibernate and am working my way through the book "Java Persistence with Hibernate". I downloaded hibernate-3.2.6.ga.zip and am using JDK 1.5 (which causes the Generics related warning messages). When you said that I need to use a JPA implementation of Hibernate, do I need to download a different package? Or do you mean I need to use javax.persistence package classes somehow. I'm sure you can see how lost I am. :)

Thanks!

JPA is a Java spec and hibernate has a Java spec. It is a little bit different from doing standard hibernate and you do need extra libraries from the hibernate site to get it going. You might want to look at hibernate's entity manager extension, and for JPA tutorial just google JPA and you will get thousands of pages. However, since you are learning now, you don't really need it now. I would say just live with that warning and later you can move to a JPA solution if you need.



Farzad-

If you can't live with the warning or find it annoying, you can either switch it off in eclipse or just add the following just above the start of your method:

@suppresswarnings("unchecked")

It's a rather normal thing to do as API's (such as Hibernate's) try to keep backward compatibility and it will therefore not be possible to fix the unchecked type warnings.

Thanks for the replies Farzad and tomba.

For now,I have used @SuppressWarnings("unchecked") to supress the eclipse warning messages. I will also learn about JPA as Farzad suggested.

Thanks guys, you have been of great help. :)