MapGenerator iggnores @Id annotation

bibodo · **Posted:** Fri Mar 24, 2006 9:43 am

I have a class with an id field and with the @Id annotation but net.sf.hibernate.tool.class2hbm.MapGenerator does not generate any mapping for this class claiming that there is no UID defined in the class.
What did I wrong ?

Hibernate version:
2.1.3

Class definition:

@Entity
public class A {
@Id
private int id;
@Id
public final int getId() {
return id;
}
}

generated mapping:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
</hibernate-mapping>

tpalfalvi · **Posted:** Fri Mar 24, 2006 10:22 am

You should decide if you want to annotate the getters or the fields themselves, and then stick to that decision. Don't annotate both, it will probably confuse Hibernate. Try removing one of the @Id annotations and see if you still get an error.

emmanuel · **Posted:** Sat Mar 25, 2006 9:49 am

so you managed to make the annotations working with Hibernate 2.1.3. Nice ;-)

bibodo · **Posted:** Wed Mar 29, 2006 5:11 am

tpalfalvi wrote:

You should decide if you want to annotate the getters or the fields themselves, and then stick to that decision. Don't annotate both, it will probably confuse Hibernate. Try removing one of the @Id annotations and see if you still get an error.

I tried it with the following:

Code:

@Entity
public class A implements IA {
    private int id;
    @Id
    public final int getId() {
        return id;
    }
    public B getB() {
        return null;
    }
}

But the result is the same as before:

Code:

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<!-- hibernate.bug.A cannot be added, no UID found! -->
<hibernate-mapping>
</hibernate-mapping>

bibodo · **Posted:** Wed Mar 29, 2006 5:25 am

emmanuel wrote:

so you managed to make the annotations working with Hibernate 2.1.3. Nice ;-)

I think I didn't manage to make the annotations working with Hibernate 2.1.3. It is still not working.
do you have any hint to get it working?

max · **Posted:** Fri Mar 31, 2006 8:08 am

I think you are mixing incompatible stuff.

e.g. net.sf.hibernate.tool.class2hbm is a deprecated class to hibernate 2 mapping file tool. This tools has no clue about annotations.

If you *really* want to generate hibernate 2 mappings from annotations the way to go is to use Hibernate Tools (tools.hibernate.org) with some custom templates.

The tool will allow you to parse the annotated classes into hibernate meta model from which you can generate mappings via the <hbm2hbmxml/> task. You will need to customize some of the output since it currently generates H3 compliant files, but it should be possible to tweak the templates to be readable by hibernate 2.