JPA - CascadeType Examples

@Entity
public class EntityC {
    @Id
    @GeneratedValue
    private int myIdC;
    @OneToOne(cascade = CascadeType.PERSIST)
    private EntityD entityD;
    .............
}

@Entity
public class EntityD {
    @Id
    @GeneratedValue
    private int myIdD;
    private String stringD;
    .............
}

@Entity
public class Employee {
    @Id
    @GeneratedValue
    private long id;
    private String name;
    @OneToMany(mappedBy = "taskEmployee", cascade = CascadeType.ALL)
    @MapKeyColumn(name = "TASK_DATE", nullable = true)
    private Map<Date, Task> tasks;
    .............
}

@Entity
public class Task {
    @Id
    @GeneratedValue
    private long id;
    private String name;
    private String description;
    @ManyToOne
    @JoinColumn(name = "EMP_FK")
    private Employee taskEmployee;
    .............
}

import javax.persistence.*;
import java.util.ArrayList;
import java.util.List;

@Entity
public class Customer {
    @Id
    @GeneratedValue
    private int id;
    private String name;
    private String address;
    @OneToMany(mappedBy = "customer", cascade = CascadeType.ALL)
    private List<OrderItem> orderItems = new ArrayList<>();
    .............
}

import javax.persistence.*;

@Entity
public class OrderItem {
    @Id
    @GeneratedValue
    private int id;
    private String itemName;
    private int quantity;
    @ManyToOne(cascade = {CascadeType.ALL})
    @JoinColumn(name = "CUST_ID")
    private Customer customer;
    .............
}