List contains objects not Dept objects??

adenjones · **Joined:** Tue Mar 24, 2009 3:47 am **Posts:** 9

This is my code

List tempDepartments = new ArrayList<Dept>();
tempDepartments = session.createQuery("from Dept").list();

for(Dept d : tempDepartments)
{
departments.add(new SelectItem(d.getDept_id(),d.getDept_name()));
}

the error that Iam getting is that it says that the line (for(Dept d : tempDepartments)) contains incompatible types

[javac] found : java.lang.Object
[javac] required: com.timekeeper.model.Dept
[javac] for(Dept d : tempDepartments)

okay now Iam using:

List<Dept> tempDepartments = new ArrayList<Dept>();

tempDepartments = session.createQuery("from Dept").list();

for(Dept d : tempDepartments)
{
departments.add(new SelectItem(d.getDept_id(),d.getDept_name()));
}

It works but Iam getting a warning saying that Iam using unsafe constructs??

amersohail794 · **Joined:** Wed Sep 21, 2005 8:18 am **Posts:** 31

Type cast it to List<Dept> will remove warning e..g

tempDepartments = (List<Dept>)session.createQuery("from Dept").list();

adenjones · **Joined:** Tue Mar 24, 2009 3:47 am **Posts:** 9

Now Iam getting

warning: [unchecked] unchecked cast

bmelloni · **Joined:** Wed Aug 11, 2004 3:50 pm **Posts:** 26

I noticed that Hibernate doesn't cast collections according to their member types. What you are experiencing is clearly a symptom of this behavior.

For example, when I allowed Hibernate Tools to generate the classes for me, it expressed the relationships with no regard to type. So, if you had a Company class that has a many-to-one relationship to Dept, it would generate it as 'private Set depts' instead of 'private Set<Dept> depts'. That will obviously trigger warnings with Java 5 or 6.

I don't know if there is a good way to change that behavior. I've even considered modifying the generated classes to show the type, but I am concerned that it might interfere with Hibernate's behavior.

For now, I think your best choice is to cast. You can always use the annotation @SuppressWarnings("unchecked") to silence the warning.

jackpunt · **Joined:** Sat Mar 28, 2009 5:47 pm **Posts:** 14

tempDepartents should also be:

Code:

List<Dept> tempDepartments = new ArrayList<Dept>();

Then, as mentioned above, this will work without warnings::

Code:

tempDepartments = (List<Dept>)session.createQuery("from Dept").list();

sic_people · **Joined:** Mon Apr 13, 2009 4:36 pm **Posts:** 2

Thsi is a java problem, not an hibernate problem, the warning is because of the Typer Erasure, you shoul'd (or could) add the annotation @SuppressWarnings("unchecked"), to the method that contains that call, is the cleanest way to solve this problem.

adenjones · **Joined:** Tue Mar 24, 2009 3:47 am **Posts:** 9

I will come back to it later. Thanks for the help guys

adenjones · **Joined:** Tue Mar 24, 2009 3:47 am **Posts:** 9

I will come back to it later. Thanks for the help guys

adenjones · **Joined:** Tue Mar 24, 2009 3:47 am **Posts:** 9

I will come back to it later. Thanks for the help guys

duck · **Joined:** Mon Apr 13, 2009 11:05 pm **Posts:** 1

thank you so much!
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Dr.Lee · **Joined:** Fri May 01, 2009 6:43 pm **Posts:** 1

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fahim007 · **Joined:** Wed May 06, 2009 3:57 am **Posts:** 1

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It is a nice post. I got it very useful. Thanks!

joey888 · **Joined:** Wed May 06, 2009 7:55 am **Posts:** 1

had same problem. thanks hibernate forum.
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caramel1982 · **Joined:** Sat May 09, 2009 6:14 am **Posts:** 4

Thanks for this information. You are very techie. I hope I will become like you are. Currently I am practicing coding.

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spongebob · **Joined:** Wed Jul 01, 2009 4:18 am **Posts:** 1

thanks for your help

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