Hibernate/JPA incorrect join in Spring Boot Application

Question

See code below for my 2 entity classes - when I call the findAll() method from my OrigRepository class, it joins these two tables using both primary keys. I want the join to be between the primary key of the Orig table and the foreign key entry in the MsgResponse table ("OrigID") - any sugggestions?

Orig Entity

@Entity
@Table(name = "originator")
public class Orig {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "OrigID")
    private int OrigID;

    @OneToOne(cascade = CascadeType.ALL) 
    @JoinColumn(name = "OrigID")  
    private MsgResponse responseInfo;
}

MsgResponse Entity

@Entity
@Table(name = "message_response")
public class MsgResponse {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private int responseId;

    @Column(name = "OrigID")
    private int OrigId;

    @OneToOne(mappedBy="responseInfo")
    private Orig OrigInfo; 
}

Answer 1

I suggest you to see the jpa documentation here .

Example 1 should be your case

Answer 2

Try to swap relation ownership, that is:

@Entity
@Table(name = "originator")
public class Orig {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "OrigID")
    private int OrigID;

    @OneToOne(mappedBy="origInfo") 
    private MsgResponse responseInfo;
}

@Entity
@Table(name = "message_response")
public class MsgResponse {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "ID")
    private int responseId;

    // @Column(name = "OrigID")
    // private int origId;

    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "OrigID")  
    private Orig origInfo; 
}

Note that the @JoinColum annotation is in now in the MsgResponse entity. This is because in a @OneToOne the join column refers to the source entity (see here ).

Hope this could help.