Hello to everybody!

I've got the following problem and I hope that somebody is able to give me a hint how to solve it:

There are two domain objects Product and Keyword. They are joined as one-2-many (one product can have many keywords):

//slice of Product.hbm.xml:
<set name="keywords" lazy="false" inverse="true" fetch="subselect" order-by="name" cascade="all">
<key >
<column name="customerId" />
<column name="productId" />
</key>
<one-to-many class="....Keyword"/>
</set>

Keyword has a composite-id containing four attributes.

The problem is, assuming that I've one product-object with one keyword, when I do some modification on one field of the composite-Key of the keyword and after that I save the product-object, I still get two keywords corresponding to the product-object in the database. One with the "old" composite-key, and one with the modificated one. I can guarantee, that the product Object contains only one keyword before saving.

I know, it's not the finest way to do modifications on key-fields. But in this case it is necessary. How can I tell hibernate to simply update the existing keyword and not to keep the "old" one?

I dont wanna delete every corresponding keyword before saving the product...


Best regards
roman

It is not possible to change the primary key of an entity. This usually results in an exception. I don't know why this doesn't happen in your case. The proper way is to delete the old keyword and then insert the new one.