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arnieAustin
 Post subject: Strange Error with discriminated table and abstract ancestor
PostPosted: Mon Dec 11, 2017 11:44 am 
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Location: Austin, Tx, USA, NA, Sol 3
Using 5.2.12.Final. I have a simple main class that creates an EntityManager instance to validate my mappings (and create the schema).

I have a parent table (Applicant) that has a child table (ProofDocument). The latter of which is abstract and has the @DiscriminatorColumn and @DiscriminatorOptions annotations.

ProofDocument has two descendants: ProofDocumentId and ProofDocumentSsn.

The @OneToMany linkages from Applicant look like this:

Code:
   @Fetch(FetchMode.SELECT)
   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "applicant", orphanRemoval = true)
   @Where(clause = "IDPR_PROOF_TYP = '2 '") // needs trailing space
   public List<ProofDocumentId> getProofDocumentIdCollection() {
      return proofDocumentIdCollection;
   }

   @Fetch(FetchMode.SELECT)
   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "applicant", orphanRemoval = true)
   @Where(clause = "IDPR_PROOF_TYP = '1 '") // needs trailing space
   public List<ProofDocumentSsn> getProofDocumentSsnCollection() {
      return proofDocumentSsnCollection;
   }


(Setters removed for brevity.)

The ancestor ProofDocument references the Applicant (parent) like so:

Code:
   @JoinColumn(name = "IDPR_PERSON_ID", insertable = false, nullable = false, updatable = false,
      foreignKey = @ForeignKey(name = "fk_pod_a__person_id"))
   @ManyToOne(fetch = FetchType.LAZY, optional = false)
   @NotNull(message = "proofDocument.applicant.required")
   public Applicant getApplicant() {
      return applicant;
   }


ProofDocument is abstract because an instance of it makes no sense, only an instance of the descendants is valid.

So, why am I getting:

Code:
org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: a.b.c.ProofDocumentId.applicant in a.b.c.Applicant.proofDocumentIdCollection


when it is clearly in the ancestor class of ProofDocumentId/Ssn. I should NOT have to move Applicant from ancestor to descendant to clear this error, but that's what I had to do.
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vlad
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Mon Dec 11, 2017 12:52 pm 
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Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
Did you add @MappedSupercclass in the Applicant class?
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arnieAustin
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Mon Dec 11, 2017 8:32 pm 
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Joined: Thu Jan 12, 2006 6:32 pm
Posts: 39
Location: Austin, Tx, USA, NA, Sol 3
I assume you meant the ProofDocument class, not Applicant. Added it, to no effect.
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vlad
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Tue Dec 12, 2017 6:21 am 
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Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
I still don't understand how your entities look like. It's much easier if you just post them entirely.
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arnieAustin
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Tue Dec 12, 2017 9:53 am 
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Joined: Thu Jan 12, 2006 6:32 pm
Posts: 39
Location: Austin, Tx, USA, NA, Sol 3
The Parent:

Code:
@Entity
@Table(name = "APPLICANT")
public class Applicant implements Serializable {
/* fields */

/* children */
   private List<ProofDocumentId> proofDocumentIdCollection;
   private List<ProofDocumentSsn> proofDocumentSsnCollection;

   @Fetch(FetchMode.SELECT)
   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "applicant", orphanRemoval = true)
   @Where(clause = "IDPR_PROOF_TYP = '2 '") // needs trailing space
   public List<ProofDocumentId> getProofDocumentIdCollection() {
      return proofDocumentIdCollection;
   }

   public void setProofDocumentIdCollection(List<ProofDocumentId> proofDocumentIdCollection) {
      this.proofDocumentIdCollection = proofDocumentIdCollection;
   }

   @Fetch(FetchMode.SELECT)
   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "applicant", orphanRemoval = true)
   @Where(clause = "IDPR_PROOF_TYP = '1 '") // needs trailing space
   public List<ProofDocumentSsn> getProofDocumentSsnCollection() {
      return proofDocumentSsnCollection;
   }

   public void setProofDocumentSsnCollection(List<ProofDocumentSsn> proofDocumentSsnCollection) {
      this.proofDocumentSsnCollection = proofDocumentSsnCollection;
   }



The child ancestor, which is abstract.

Code:
@DiscriminatorColumn(name = "IDPR_PROOF_TYP", discriminatorType = DiscriminatorType.STRING)
@DiscriminatorOptions(force = true, insert = false)
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@MappedSuperclass
@Table(name = "PROOF_DOCUMENT")
public abstract class ProofDocument implements Serializable {
/* fields */

   private Applicant applicant; /* parent reference */

   @JoinColumn(name = "IDPR_PERSON_ID", insertable = false, nullable = false, updatable = false,
      foreignKey = @ForeignKey(name = "fk_pod_a__app_id"))
   @ManyToOne(fetch = FetchType.LAZY, optional = false)
   @NotNull(message = "proofDocument.applicant.required")
   public Applicant getApplicant() {
      return applicant;
   }
   public void setApplicant(Applicant applicant) {
      this.applicant = applicant;
   }   


One of the two descendants.

Code:
@DiscriminatorValue("2 ") // see: ProofDocumentProofTypeEnum.ID.getValue())
@Entity
public class ProofDocumentId extends ProofDocument implements Serializable {

   private static final long serialVersionUID = 1L;

   public ProofDocumentId() {
      super();
      setProofDocumentTypeEnum(ProofDocumentTypeEnum.ID);
   }
}


This is what I think I should be able to do. But because of this error, I have to put the Application back reference in the descendant, not the ancestor.
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vlad
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Tue Dec 12, 2017 10:12 am 
Hibernate Team
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Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
You should never combine @Inheritance with @MappedSuperclass. It's an illegal mapping.

Code:
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@MappedSuperclass
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arnieAustin
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Tue Dec 12, 2017 5:47 pm 
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Joined: Thu Jan 12, 2006 6:32 pm
Posts: 39
Location: Austin, Tx, USA, NA, Sol 3
So, does that mean that what I want to do is impossible:

specify the @ManyToOne in the ancestor rather than the descendant?
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vlad
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Wed Dec 13, 2017 2:30 am 
Hibernate Team
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Joined: Thu Sep 11, 2014 2:50 am
Posts: 1628
Location: Romania
1. Try making ProofDocument an entity, like this:

Code:
@DiscriminatorColumn(name = "IDPR_PROOF_TYP", discriminatorType = DiscriminatorType.STRING)
@DiscriminatorOptions(force = true, insert = false)
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Entity
@Table(name = "PROOF_DOCUMENT")
public class ProofDocument implements Serializable {
    ...
}


2. The bidirectional mapped is also wrong because the @ManyToOne side is marlet with insertbale/updatable=false:

Code:
@JoinColumn(name = "IDPR_PERSON_ID", nullable = false,
  foreignKey = @ForeignKey(name = "fk_pod_a__app_id"))
@ManyToOne(fetch = FetchType.LAZY, optional = false)
@NotNull(message = "proofDocument.applicant.required")
public Applicant getApplicant() {
  return applicant;
}


You need this side to control the association because the other side is ignored, being mappedBy.
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arnieAustin
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Wed Dec 13, 2017 12:55 pm 
Beginner
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Joined: Thu Jan 12, 2006 6:32 pm
Posts: 39
Location: Austin, Tx, USA, NA, Sol 3
I made the changes you suggested, and the children are as they always were:

Code:
@DiscriminatorColumn(name = "IDPR_PROOF_TYP", discriminatorType = DiscriminatorType.STRING)
@DiscriminatorOptions(force = true, insert = false)
@Entity
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@Table(schema = "DLNDLF", name = "PROOF_OF_ID_INFO")
public abstract class ProofDocument extends BaseDLSDataEntity<Long> implements Serializable {
...
   @JoinColumn(name = "IDPR_PERSON_ID", nullable = false,
      foreignKey = @ForeignKey(name = "fk_podid_a__person_id"))
   @ManyToOne(fetch = FetchType.LAZY, optional = false)
   @NotNull(message = "proofDocument.applicant.required")
   public Applicant getApplicant() {
      return applicant;
   }



Code:
@DiscriminatorValue("2 ") // see: ProofDocumentProofTypeEnum.ID.getValue())
@Entity
public class ProofDocumentId extends ProofDocument implements Serializable {


Code:
@DiscriminatorValue("1 ") // see: ProofOfDocumentDocumentTypeEnum.SSN.getValue())
@Entity
public class ProofDocumentSsn extends ProofDocument implements Serializable {


Code:
   private List<ProofDocumentId> proofDocumentIdCollection;
   private List<ProofDocumentSsn> proofDocumentSsnCollection;

   @Fetch(FetchMode.SELECT)
   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "applicant", orphanRemoval = true)
   @Where(clause = "IDPR_PROOF_TYP = '2 '") // needs trailing space
   public List<ProofDocumentId> getProofDocumentIdCollection() {
      return proofDocumentIdCollection;
   }

   @Fetch(FetchMode.SELECT)
   @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY, mappedBy = "applicant", orphanRemoval = true)
   @Where(clause = "IDPR_PROOF_TYP = '1 '") // needs trailing space
   public List<ProofDocumentSsn> getProofDocumentSsnCollection() {
      return proofDocumentSsnCollection;
   }



yet the error persists:

Code:
org.hibernate.AnnotationException: mappedBy reference an unknown target entity property: a.b.c.ProofDocumentId.applicant in a.b.c.Applicant.proofDocumentIdCollection


This is very weird, its like Hibernate cannot see the Applicant entity that is part of the abstract ancestor.
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arnieAustin
 Post subject: Re: Strange Error with discriminated table and abstract ancestor
PostPosted: Wed Dec 13, 2017 1:20 pm 
Beginner
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Joined: Thu Jan 12, 2006 6:32 pm
Posts: 39
Location: Austin, Tx, USA, NA, Sol 3
I found this article which appears to be encountering the same problem but I don't understand the answer.

https://stackoverflow.com/questions/763 ... rty-in-jpa
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