@tinjaw:

There is your problem. You should never reuse such a key. Unique Primary Keys are the heart and soul of any database.

-tinjaw (October 04, 2007, 08:29 AM)

The emphasis is "business". A business key is something that you can use to distinguish between records and to find and identify records, e.g. a user name when the your entity is user, or an isbn nummer when you manage books, or a social card number. It is something that you would use in the "from" part of a select statement. You should not use this as primary key. The primary key should not have a business meaning, only a technical. Best is you let the database manage the primary key, for instance in ms sql use an identity column. The background of my question to Ralf Maximus was that i was interested whether his business key is unique or not.

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@Ralf Maximus:
Absolutely yes, this sounds mature and well designed. Thank you for the inside view.

You could use one vm (VMWare) for each java version. This would ensure that you have a clean test environment and not unwanted side effects.