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.bug.A cannot be added, no UID found! -->
<hibernate-mapping>
</hibernate-mapping>

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.

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

I tried it with the following:

But the result is the same as before:

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?

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.