JPA - @EmbeddedId Examples

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;

@Entity
public class Customer {
    @EmbeddedId
    private CustomerId id;
    private String address;

    public CustomerId getId() {
        return id;
    }

    public void setId(CustomerId id) {
        this.id = id;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "id=" + id +
                ", address='" + address + '\'' +
                '}';
    }
}

import javax.persistence.Embeddable;
import java.io.Serializable;

@Embeddable
public class CustomerId implements Serializable {
    private String name;
    private String phoneNumber;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    @Override
    public String toString() {
        return "CustomerId{" +
                "name='" + name + '\'' +
                ", phoneNumber='" + phoneNumber + '\'' +
                '}';
    }
}

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import java.util.Date;

@Entity
public class Task {
    @EmbeddedId
    private CompositeTaskId taskId;
    private String taskName;
    private Date date;

    public Task() {
    }

    public Task(CompositeTaskId taskId) {
        this.taskId = taskId;
    }

    public String getTaskName() {
        return taskName;
    }

    public void setTaskName(String taskName) {
        this.taskName = taskName;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    @Override
    public String toString() {
        return "Task{" +
                "taskId=" + taskId +
                ", taskName='" + taskName + '\'' +
                ", date=" + date +
                '}';
    }
}

import javax.persistence.Embeddable;
import java.io.Serializable;
import java.util.Objects;

@Embeddable
public class CompositeTaskId implements Serializable {
    private int employeeId;
    private int taskId;

    public CompositeTaskId() {
    }

    public CompositeTaskId(int employeeId, int taskId) {
        this.employeeId = employeeId;
        this.taskId = taskId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CompositeTaskId taskId1 = (CompositeTaskId) o;
        if (employeeId != taskId1.employeeId) return false;
        return taskId == taskId1.taskId;
    }

    @Override
    public int hashCode() {
        return Objects.hash(employeeId, taskId);
    }

    @Override
    public String toString() {
        return "CompositeTaskId{" +
                "employeeId=" + employeeId +
                ", taskId=" + taskId +
                '}';
    }
}

import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.ManyToOne;
import javax.persistence.MapsId;
import java.util.Date;

@Entity
public class Task {
    @EmbeddedId
    private CompositeTaskId taskId;

    @MapsId("employeeKey")
    @ManyToOne
    private Employee employee;

    private String taskName;
    private Date date;

    public Task() {
    }

    public Task(CompositeTaskId taskId, Employee employee) {
        this.taskId = taskId;
        this.employee = employee;
    }

    public String getTaskName() {
        return taskName;
    }

    public void setTaskName(String taskName) {
        this.taskName = taskName;
    }

    public Date getDate() {
        return date;
    }

    public void setDate(Date date) {
        this.date = date;
    }

    @Override
    public String toString() {
        return "Task{" +
                "taskId=" + taskId +
                ", employee=" + employee +
                ", taskName='" + taskName + '\'' +
                ", date=" + date +
                '}';
    }
}

import javax.persistence.Embeddable;
import java.io.Serializable;
import java.util.Objects;
@Embeddable
public class CompositeTaskId implements Serializable{
    private long employeeKey;
    private long taskId;

    public CompositeTaskId() {
    }

    public CompositeTaskId(long employeeId, long taskId) {
        this.employeeKey = employeeId;
        this.taskId = taskId;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
        CompositeTaskId taskId1 = (CompositeTaskId) o;
        if (employeeKey != taskId1.employeeKey) return false;
        return taskId == taskId1.taskId;
    }

    @Override
    public int hashCode() {
        return Objects.hash(employeeKey, taskId);
    }

    @Override
    public String toString() {
        return "CompositeTaskId{" +
                "employeeKey=" + employeeKey +
                ", taskId=" + taskId +
                '}';
    }
}