0 Replies Latest reply on Jan 3, 2007 2:25 PM by Rafael Rech

    One-to-one and cascade

    Rafael Rech Newbie

      Hi all,

      I´m trying to set up an one-to-one relationship between two entities using CascadeType.ALL.
      The scenario is the following:

      1) Entity CidadeNacional has a primary key property called id, some other properties and a property called faixaCep of type FaixaCep configured using the following annotations:
      @OneToOne(cascade = CascadeType.ALL)
      @PrimaryKeyJoinColumn(name = "id", referencedColumnName = "id")

      2) Entity FaixaCep has an id property configured using the following annotations:
      @Id
      @GeneratedValue(generator = "system-foreign")
      @GenericGenerator(name = "system-foreign", strategy = "foreign", parameters = {@Parameter(name = "property", value = "cidade")})
      So it shares the PK with entity CidadeNacional

      3) Still in FaixaCep there is a property cidade of type CidadeNacional configured using the following annotation
      @OneToOne(mappedBy = "faixaCep", targetEntity=CidadeNacional.class)

      It works fine if I first save a CidadeNacional with a FaixaCep.
      But, if I first save a CidadeNacional without a FaixaCep, then I load it and try to save it again setting a FaixaCep I get an excpetion.
      Here is an extract of my code:
      CidadeNacional cidade = new CidadeNacional(...);
      cidade.setFaixaCep(null);
      entityManager.persist(cidade); // OK
      ... // Load CidadeNacional
      FaixaCep faixa = new FaixaCep(...);
      faixa.setId(null);
      faixa.setCidade(cidade);
      cidade.setFaixaCep(faixa);
      entityManager.merge(cidade); // Excpetion

      The stack trace is:
      Caused by: org.hibernate.id.IdentifierGenerationException: attempted to assign id from null one-to-one property: cidade
      at org.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:44)
      at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:98)
      at org.hibernate.event.def.DefaultMergeEventListener.entityIsTransient(DefaultMergeEventListener.java:165)
      at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:102)
      at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:689)
      at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:671)
      at org.hibernate.engine.CascadingAction$6.cascade(CascadingAction.java:156)
      at org.hibernate.engine.Cascade.cascadeToOne(Cascade.java:213)
      at org.hibernate.engine.Cascade.cascadeAssociation(Cascade.java:157)
      at org.hibernate.engine.Cascade.cascadeProperty(Cascade.java:108)
      at org.hibernate.engine.Cascade.cascade(Cascade.java:248)
      at org.hibernate.event.def.DefaultMergeEventListener.cascadeOnMerge(DefaultMergeEventListener.java:332)
      at org.hibernate.event.def.DefaultMergeEventListener.entityIsPersistent(DefaultMergeEventListener.java:131)
      at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:105)
      at org.hibernate.event.def.DefaultMergeEventListener.onMerge(DefaultMergeEventListener.java:51)
      at org.hibernate.impl.SessionImpl.fireMerge(SessionImpl.java:679)
      at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:663)
      at org.hibernate.impl.SessionImpl.merge(SessionImpl.java:667)
      at org.hibernate.ejb.AbstractEntityManagerImpl.merge(AbstractEntityManagerImpl.java:201)
      ... 93 more

      Could somebody help me?

      Thanks