[hibernate-dev] Composite IDs with a null property/field

Currently, there is no way to load an entity that exists in the database with a composite ID, if one of the composite ID columns is null. This behavior is due to this code in ComponentType#hydrate: https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src... Basically, if any field/property in a composite ID is null, Hibernate assumes the entire ID is null. An entity cannot have a null ID, so it returns null for the entity result. I believe that Hibernate does allow a primary key column to be nullable. TBH, it seems strange to have a property in a composite ID that can be null. If it can be null, it seems that the property could be removed from the composite key. I don't see anything in the spec about a requirement that all composite ID fields/properties must be non-null. Am I missing something? The code I referenced above is 13 years old. Does anyone have insight into why Hibernate does this? Thanks, Gail