java - Hibernate mapping a composite key with null values

Question

With Hibernate, can you create a composite ID where one of the columns you are mapping to the ID can have null values?

This is to deal with a legacy table that has a unique key which can have null values but no primary key.

I realise that I could just add a new primary key column to the table, but I'm wondering if there's any way to avoid doing this.

Answer 1

No. Primary keys can not be null.