I am referencing an Entity in another Entity class and getting this error. Below is sample code. I have these classes in the persistence.xml as well.
What is causing this issue? I am using Spring data JPA and Hibernate.
import javax.persistence.*;
@Entity
@Table(name = "users", schema = "university")
public class UsersEntity {
private long id;
@JoinColumn(name = "address_id", nullable = false)
private Address address;
@Id
@Column(name = "id")
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}
import javax.persistence.*;
@Entity
@Table(name = "address", schema = "university")
public class AddressEntity {
private long id;
private String street;
@Id
@Column(name = "id")
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Basic
@Column(name = "street")
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
}
2 Answers
So try the following:
@Entity
@Table(name = "users", schema = "university")
public class UsersEntity {
private Long id;
private AddressEntity address;
@Id
@Column(name = "id")
public Long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@OneToOne
@JoinColumn(name = "address_id", nullable = false)
public AddressEntity getAddress() {
return address;
}
public void setAddress(AddressEntity address) {
this.address = address;
}
}
@Entity
@Table(name = "address", schema = "university")
public class AddressEntity {
private Long id;
private String street;
@Id
@Column(name = "id")
public Long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
@Column(name = "street")
public String getStreet() {
return street;
}
public void setStreet(String street) {
this.street = street;
}
}
Basically what I did was replace the long for Long. and added the @OneToOne I removed the @Basic since its optional. I believe with that it should just work
You missed the type of relationship between entities. E.g. you can define one-directional @OneToOne as
//...
public class UsersEntity {
//..
@OneToOne(mappedBy = "ugdArea", fetch = FetchType.LAZY)
@JoinColumn(name = "address_id", nullable = false)
private Address address;
//...
}
