Hi!

I use Spring 3 and Hibernate 3. and have the following problem:

This is a piece of my class I want to persist


In my test method I set the id and persist my object via



When I start this test I get


It's strange, because, when I remove the @Id annotation and define another property as identifier, which is generated by Hibernate, everything works fine.
Does anybody know what's going on?
Any help is appreciated :)

Since it is a String you either need to assign your own id or specify a generator that know how to generate string values. The standard ones in JPA only works with numbers, but Hibernate defines some additional generators. Most of them work with numbers as well, but I think there is one that generates GUID/UUID values. Read http://docs.jboss.org/hibernate/stable/ ... identifier and http://docs.jboss.org/hibernate/stable/ ... aration-id for some more information.

Thanks for your answer :)

As I stated, if I let hibernate generate the Id, it works. But I need to set the Id from the application. But if I assign my own Id via

the ORA-01400 occurs.

I assume that the Id is not included in the SQL because Hibernate thinks the database is going to generate it... You'll probably need to specify that you are using the "assigned" identifier generator.

I tried this:


But without succes.
Several pages say, that the simple annotation



tells hibernate, that the application takes care of the id.

Now I'm confused. Can somebody shed light on this?

Any help is appreciated. Thank you! :)

The default identifier generation strategy is AUTO (http://docs.jboss.org/hibernate/stable/ ... identifier) which means that the database is supposed to generate the id. Exactly how this is done depends on the underlying database.

@GenericGenerator is not enough to specify a different strategy. I think you also need the @GeneratedValue annotation as described here: http://docs.jboss.org/hibernate/stable/ ... identifier

I can't see, that AUTO is the default strategy.

The documentation says


But it doesn't say how to annotate identifiers, that are set by the application. And the annotation



doesn't work either.

And it gets stranger: I have a @OneToMany with a @JoinTable, which contains the primary keys of the related entities.
One of these entities is the one I'm trying to map application generated identifier for. And there are three identifiers:



But for some reason the JoinTable only contains id2 as identifier for this entity.

Are these errors related?