Question

Is it possible in plain JPA or JPA+Hibernate extensions to declare a composite key, where an element of the composite key is a sequence?

This is my composite class:

@Embeddable public class IntegrationEJBPk implements Serializable {      //...       @ManyToOne(cascade = {}, fetch = FetchType.EAGER)     @JoinColumn(name = 'APPLICATION')     public ApplicationEJB getApplication() {         return application;     }       @Column(name = 'ENTITY', unique = false, nullable = false, insertable = true, updatable = true)     public String getEntity() {         return entity;     }      @GeneratedValue(strategy = GenerationType.AUTO, generator = 'INTEGRATION_ID_GEN')     @SequenceGenerator(name = 'INTEGRATION_ID_GEN', sequenceName = 'OMP_INTEGRATION_CANONICAL_SEQ')     @Column(name = 'CANONICAL_ID', unique = false, nullable = false, insertable = true, updatable = true)     public String getCanonicalId() {         return canonicalId;     }      @Column(name = 'NATIVE_ID', unique = false, nullable = false, insertable = true, updatable = true)     public String getNativeId() {         return nativeId;     }      @Column(name = 'NATIVE_KEY', unique = false, nullable = false, insertable = true, updatable = true)     public String getNativeKey() {         return nativeKey;     }      //... } 

I already supply the values for application, entity, nativeId and nativeKey. I want to construct an entity like the one below:

IntegrationEJB i1 = new IntegrationEJB(); i1.setIntegrationId(new IntegrationEJBPk()); i1.getIntegrationId().setApplication(app1); i1.getIntegrationId().setEntity('Entity'); i1.getIntegrationId().setNativeId('Nid'); i1.getIntegrationId().setNativeKey('NK'); 

And when I call em.persist(i1), I want that the canonicalId is generated and the integration is inserted.

Is this possible? If so, what’s the simple way? (I prefer not to use application-provided keys or native sql).

Answer 1

I believe that this is not possible with plain JPA.