best code gen tool for JPA/hibernate

can someone recommend a good code gen tool for JPA/hibernate?  preferably this tool should handle relations such as many-to-many.  thanks.
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Sharon SethCommented:
hbm2java - have you tried this?
mmingfeilamAuthor Commented:
i have look at some of the online documentation on it, it appears to use a hibernate mapping file.  can you simply use a Oracle DB's schema?  thanks.
Sharon SethCommented:
I don't think so , and I don't think there is a straight way for that . Possibly you will have to  generate  class diagrams from Oracle Db's schema and then use some tool for generating code from class diagrams

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