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persisting object q

From: <glassfish_at_javadesktop.org>
Date: Sun, 10 Jan 2010 06:45:23 PST

I use derby and have a table with primary key generated as follows:
    ID INTEGER PRIMARY KEY GENERATED ALWAYS AS IDENTITY

What I expect is when I create an entry the ID field will be automatically generated by the database and will be incremented each time.

When I persist a new object what value should the id field hold ?

(complete newbie to jpa, sorry if even the question is wrong :)
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