Generate database model from Java beans

[Chema]

Hello:

I think that this question is a bit off topic ...
I've got a lot of Java bean classes and I would like to generate a
database model from these classes.
I don't need to generate it every application startup ( like
hbm2ddl.auto property in Hibernate framework ) but just to create
database model once

Do you know any tool to perform this ?

PD: I know that I can do it by loading every class and get all
property/method by reflection. But I'm looking for something more easy

Thanks and regards