org.hibernate.AnnotationException：从y引用x的外键具有错误的列数。 应该是n

Question

the following exception happens during hibernate initialisation:

org.hibernate.AnnotationException: A Foreign key refering com.maar.projectbuilder.domain.Language from com.maar.projectbuilder.domain.ItemInfo has the wrong number of column. should be 0

I have the tables as in the screenshot above. Entity classes are written as below.

public class ItemInfo implements Serializable {

   @Column(name = "name")
   private String name;

   @Id
   @OneToOne(cascade = CascadeType.ALL)
   @JoinColumn(name = "item_id", nullable = false)
   private Item itemId;

   @ManyToOne(targetEntity = Language.class,cascade = CascadeType.ALL)
   @JoinColumn(name = "language_item_id", nullable = false)
   private Language languageItemId;

   @Column(name = "type", nullable = false)
   private Integer type;
   //getters,setters,constructors
}

another one

public class Language implements Serializable {
   @Column(name = "isDefault")
   private Integer isDefault;

   @Column(name = "abbr")
   private String abbr;

   @Column(name = "name")
   private String name;

   @Id
   @OneToOne(cascade = {CascadeType.ALL})
   @JoinColumn(name = "item_id")
   private Item itemId;
}

my item entity

public class Item implements Serializable {
   @Column(name = "c4i")
   private String c4i;

   @Column(name = "status")
   private Integer status=1;

   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "id")
   private Integer id;
}

How could I resolve this. What am I missing? Thank you in advance!

Answer 1

在ER图中，item_info使用联接主键：item_id，language_item_id和类型，但是在映射中，您仅映射了item_id

Answer 2

Happy News :)

I added referencedColumnName param to JoinColumn annotation and thats working fine now !

Last Entity looking like this.

public class ItemInfo implements Serializable {

    @Column(name = "name")
    private String name;

    @Id
    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "item_id", nullable = false)
    private Item itemId;

    @ManyToOne
    @JoinColumn(name = "language_item_id",**referencedColumnName = "item_id"**)
    private Language languageItemId;

    @Column(name = "type", nullable = false)
    private Integer type;
}

Thanks Everybody. Have a nice day.