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From Marco de Booij <marco.developm...@debooy.eu>
Subject Mapping a Join Table with Additional Columns
Date Sun, 26 Apr 2015 15:57:20 GMT
I use Tomee 1.7.1 with openjpa version 
openjpa-2.4.0-nonfinal-1598334-r422266.

I have an entity auteurs and an entity boek. They have a ManyToMany 
relation through the entity auteurs_boeken. In this entity there is a 
field type to define the type of the relation (writer, illustrations, 
...). I followed the 
https://en.wikibooks.org/wiki/Java_Persistence/ManyToMany page and came 
up with the following classes (left out all constructors, getters, and 
setters):

=====
@Entity
@Table(name="AUTEURS", schema="BYBLOS")
public class AuteurDto
     extends Dto implements Comparable<AuteurDto>, Cloneable {
   private static final  long  serialVersionUID  = 1L;

   @Id
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   @Column(name="AUTEUR_ID", nullable=false, unique=true)
   private Long    auteurId;
   @Column(name="NAAM", length=100, nullable=false)
   private String  naam;
   @Column(name="VOORNAAM", length=100)
   private String  voornaam;

   @OneToMany(cascade=CascadeType.ALL, fetch=FetchType.LAZY, 
mappedBy="auteur")
   private List<AuteurBoekDto> boeken;
}

=====
@Entity
@Table(name="BOEKEN", schema="BYBLOS")
public class BoekDto extends Dto implements Comparable<BoekDto>, Cloneable {
   private static final  long  serialVersionUID  = 1L;

   @Id
   @GeneratedValue(strategy=GenerationType.IDENTITY)
   @Column(name="BOEK_ID", nullable=false, unique=true)
   private Long    boekId;
   @Column(name="DEEL", precision=5, scale=0)
   private Integer deel;
   @Column(name="DRUK", precision=3, scale=0)
   private Integer druk;
   @Column(name="ISBN", length=13)
   private String  isbn;
   @Column(name="JAAR_UITGAVE", precision=4, scale=0)
   private Integer jaarUitgave;
   @Column(name="SUBDEEL", length=2)
   private String  subdeel;
   @Column(name="TAAL", length=2, nullable=false)
   private String  taal;
   @Column(name="TITEL", length=100, nullable=false)
   private String  titel;

   @OneToOne(cascade=CascadeType.ALL, fetch=FetchType.LAZY)
   @JoinColumn(name="SERIE_ID", nullable=false, updatable=false)
   private SerieDto  serie;

   @OneToMany(mappedBy="boek", fetch=FetchType.LAZY)
   private List<AuteurBoekDto> auteurs;
}

=====
@Entity
@Table(name="AUTEURS_BOEKEN", schema="BYBLOS")
@IdClass(AuteurBoekPK.class)
public class AuteurBoekDto
     extends Dto implements Comparable<AuteurBoekDto>, Cloneable {
   private static final  long  serialVersionUID  = 1L;

   @Id
   private Long    auteurId;
   @Id
   private Long    boekId;
   @Column(name="AUTEUR_TYPE", nullable=false, length=1)
   private String  auteurType;

   @ManyToOne
   @PrimaryKeyJoinColumn(name="AUTEUR_ID", referencedColumnName="auteurId")
   private AuteurDto auteur;
   @ManyToOne
   @PrimaryKeyJoinColumn(name="BOEK_ID", referencedColumnName="boekId")
   private BoekDto   boek;
}

When I fetch the boeken from within the AuteurDto I get the message:
<openjpa-2.4.0-nonfinal-1598334-r422266:1599166 fatal user error> 
org.apache.openjpa.persistence.ArgumentException: 
"eu.debooy.byblos.domain.AuteurBoekDto.auteur" defines a target of 
"auteurId" for column "AUTEUR_ID", but that target does not exist in 
table "BYBLOS.AUTEURS".
I have the same problem on the BoekDto. BoekDto has a OneToOne relation 
with SerieDto and when I read the boeken from there I get the correct 
boeken so I guess that the problem lies with my implementation of the 
ManyToMany. Can someone show me the way to the correct implementation?

Regards,

Marco

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