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Codever profile image Adrian Matei
Adrian Matei for Codever

Posted on • Edited on • Originally published at codever.dev

How to find an entity in jpa with primary key

#java #jpa #codever #snippets

Use the find method of the EntityManager, where the primary key is provided as the second parameter:

@Stateless public class PartnerRepository { @Inject private EntityManager em; public Optional<Partner> find(String partnerNumber) { return Optional.ofNullable(em.find(Partner.class, partnerNumber)); } }
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The entity looks something like the following, with partnerNumber as primary key:

@Entity @Access(AccessType.FIELD) @Table(name = "T_PARTNER") public class Partner { @Id @NotNull @Column(name = "PARTNER_NUMBER", nullable = false) private Integer partnerNumer; //other fields ignored for readability }
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