Null list returned from hibernate query with embedded id

Question

I have an entity with an embedded key. The entity has only the key as a field and the key has 7 fields, some of which can be null.

When I run the following query:

Answer 1

You are facing issue because you have included columns which may have null value. Do no include nullable columns in composite key. By RDBMS definition a key must be not null. Rethink the columns which can uniquely identify each row and make them part of your composite key.