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Q: 

Hibernate naturalID

Hibernate doesnt seem to generate a notnull constraint on a field I marked as naturalID. Is this normal?

@MappedSuperclass
public class AbstractDomainObject extends PersistentObject {

 @NaturalId
 private String code;

DB Schema: CONSTRAINT SYS_CT_47 UNIQUE(CODE) There is no not null constraint here.

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