I am having issues while persisting an child entity while parent entity has OneToManay relationship with another entity. Could someone help what could be the issue with the following setup.

@Entity
@Inheritance(strategy=InheritanceType.JOINED)
@Table(name=PERSON)
Public class Person{  //parent class

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name='DB_ID)
private Long id;

@Id
@Column(name="PERSON_ID)
Private String personId;

@OneToMany(mappedBy="address", cascade={cascadeType.PERSIST,cascadeType.MERGE}){
private List<Address> addresses;

}
} 

This is my child class

@Entity
@Table(name=EMPLOYEE)
Public class Employee extends Person{  
@Id
@Column(name="NAME)
Private String name;


}

This is the 3rd class for @OneToMany from Person to Adress

@Entity
@Table(name=ADRESS)
Public class Adress{ 

@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
@Column(name='DB_ID)
private Long id;

@Id
@Column(name="address)
Private String adress;

@ManytoOne
@joinColumn(name="parent_id", referenceColumn="PERSON_ID")
private Person person;

}

Repository for saving child class

public interface EmployeeRepository extends JpaRepository<Emploee, Long>{}

I am getting the below error.
cannot insert NULL into (“ADDRESS”.”PARENT_ID”)
Why would JPA throws this error even though i am setting “abc123” as person_id on Employee object before saving.

I am saving the entity using EmployeeRepository class but getting the following error. The child entity has requored values

Employee employee = Employee.builder()
                      .name("john does")
                      .personId("abc123")
                      .address(addressist).build();

employeeRepository.save(employee);

I am expecting that records will be persisted in all 3 tables PERSOB, EMPLOYEE and ADDRESS table but getting the error.