JPA equivalent to Hibernate's @NaturalId

Question

In Hibernate I can create a unique key using @NaturalId on several properties of the entity.

Is there a JPA equivalent annotation, something that is a part of javax.persistence?

score 9 · Accepted Answer · answered Jun 14 '13 at 08:58

9

What I usually do is add a unique constraint on the columns, using @Table(uniqueConstraints = @UniqueConstraint(columnNames={column_1, ..., column_n}))

answered Jun 14 '13 at 08:58

Johanneke

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And you also need to set nullable=false, as it is implied by Hibernate's NatuarlId – Manu Jan 26 '15 at 20:22
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This will not replace an @Id column. Petr's answer is correct. – Alkanshel Aug 10 '16 at 20:56
@Amalgovinus The question implied that the desired solution should create a unique key. It was not necessary to mimic the workings of the NaturalId annotation exactly. My answer clearly states that I add unique constraints to columns, I don't pretend I am replacing the NaturalId annotation. – Johanneke Aug 12 '16 at 09:21
@Amalgovinus I'm using `@NaturalId` as a "secondary" id, together with `@Id Integer id`. `@NaturalId` really like an unique constraints together with NOT NULL and I doubt, it can be used as primary id. – maaartinus Feb 27 '17 at 19:09

score 6 · Answer 2 · answered Jan 10 '13 at 09:06

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No, there is not. You will have to use composite keys, so either EmbeddedId or IdClass depending what you prefer.

answered Jan 10 '13 at 09:06

Petr Mensik

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JPA equivalent to Hibernate's @NaturalId

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