public class User implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name = "USER_ID")
Long userId;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "sender", cascade = CascadeType.ALL)
List<Notification> sender;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "receiver", cascade = CascadeType.ALL)
List<Notification> receiver;
}
public class Notification implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@Column(name = "NOTIFICATION_ID")
Long notificationId;
@Column(name = "TEXT")
String text;
@Column(name = "ALERT_STATUS")
@Enumerated(EnumType.STRING)
AlertStatus alertStatus = AlertStatus.NEW;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "SENDER_ID")
@JsonIgnore
User sender;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(name = "RECEIVER_ID")
@JsonIgnore
User receiver;
}
What I understood from the answer. mappedy="sender" value should be the same in the notification model. I will give you an example..
User model:
@OneToMany(fetch = FetchType.LAZY, mappedBy = "**sender**", cascade = CascadeType.ALL)
List<Notification> sender;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "**receiver**", cascade = CascadeType.ALL)
List<Notification> receiver;
Notification model:
@OneToMany(fetch = FetchType.LAZY, mappedBy = "sender", cascade = CascadeType.ALL)
List<Notification> **sender**;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "receiver", cascade = CascadeType.ALL)
List<Notification> **receiver**;
I gave bold font to user model and notification field. User model mappedBy="sender " should be equal to notification List sender; and mappedBy="receiver" should be equal to notification List receiver; If not, you will get error.