When you'e using the type int for your primary key (as opposed to using Integer), then there isn't a language-provided 'null' value. However OJB needs such a null value in order to determine whether the object has already be stored (pk != null) or not. For the primitive type int, the null value is therefore definied as 0. I'd suggest you either don't use 0 for your pks or (better) change your PK to Integer.
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