Automatically create hibernate mapping

I know there is a way to create a hibernate .hbm.xml file and the corresponding .java class automatically from a previously created DB table. Do you know how? Any Eclipse plug-in?

The Eclipse stuff's easiest to use, but the Ant stuff allows for better build-automation.
Personally I prefer to use annotations and retrofit to the existing schema where that's an option - but the generate-from-schema stuff can be useful as a first pass to save typing!
Edit: Note, this is because the generated classes can sometimes be nasty to work with. You may want to simplify some of the relationships (e.g. converting join tables from entities in their own right into associations), which is stuff the tool can't always deduce for you.

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