未插入数据库的外键值：无法在列中插入Null

Question

I am migrating client application from Hibernate to EclipseLink. But it is not inserting value for foreign key when calling persist method on student entity. Database is oracle. There is Many to one relation between Address and Student.

Also in generated SQL the foreign key column is not present.

@Entity
@Table(name = "Student", schema = "Student_DB")
@SequenceGenerator(name = "studentSeq", sequenceName = "Student_SEQ", schema = "Student_DB", allocationSize = 1)
public class StudentEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "studentSeq")
    @Column(name = "S_ID")
    private BigDecimal studentID;

    @OneToMany(mappedBy = "studentEntity", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "S_ID")
    private List<AddressEntity> addresses;

}
addAddress(address){
  address.setStudentEntity(this);

---

@Entity
@Table(name = "Address", schema = "Student_DB")
@SequenceGenerator(name = "AddressSeq", sequenceName = "Address_SEQ", schema = "Student_DB", allocationSize = 1)
public class AddressEntity implements Serializable {

    @Id
    @Column(name = "A_ID")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "AddressSeq")
    private long addressID;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "S_ID", referencedColumnName = "S_ID", insertable = false, updatable = false, nullable = false)
    private StudentEntity studentEntity;
}

---

*

> [EL Fine]: sql: 2019-06-25
> 18:39:00.895--ClientSession(1656550367)--Connection(-872205654)--INSERT
> INTO Student_DB.Student (S_ID, ...) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?,
> ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)  bind => [24 parameters
> bound] [EL Fine]: sql: 2019-06-25
> 18:39:00.946--ClientSession(1656550367)--Connection(-872205654)--INSERT
> INTO Student_DB.Address (A_ID, CO...) VALUES (?, ?, ?, ?, ?)  bind =>
> [5 parameters bound] [EL Fine]: sql: 2019-06-25
> 18:39:00.954--ClientSession(1656550367)--SELECT 1 FROM DUAL [EL
> Warning]: 2019-06-25 18:39:00.955--UnitOfWork(-922357549)--Exception
> [EclipseLink-4002] (Eclipse Persistence Services -
> 2.5.0.v20130507-3faac2b): org.eclipse.persistence.exceptions.DatabaseException Internal
> Exception: java.sql.SQLIntegrityConstraintViolationException:
> ORA-01400: cannot insert NULL into ("Student_DB"."Address"."S_ID")

*

Answer 1

The correct mapping would look like:

@Entity
@Table(name = "Student", schema = "Student_DB")
@SequenceGenerator(name = "studentSeq", sequenceName = "Student_SEQ", schema = "Student_DB", allocationSize = 1)
public class StudentEntity implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "studentSeq")
    @Column(name = "S_ID")
    private BigDecimal studentID;

    @OneToMany(mappedBy = "studentEntity", cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<AddressEntity> addresses;

}


@Entity
@Table(name = "Address", schema = "Student_DB")
@SequenceGenerator(name = "AddressSeq", sequenceName = "Address_SEQ", schema = "Student_DB", allocationSize = 1)
public class AddressEntity implements Serializable {

    @Id
    @Column(name = "A_ID")
    @GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "AddressSeq")
    private long addressID;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "S_ID", referencedColumnName = "S_ID", nullable = false)
    private StudentEntity studentEntity;
}