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JPA Entity Class using class object as parameter

I have a class User which has a parameter of another class type ShoppingList. As this…

@Entity
public class Employee implements Serializable {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(nullable = false, updatable = false)
    private Long id;
    private String Name;
    @?????
    private ShoppingList[] shoppingList;
}

How can i make this ManyToOne relationship while the variable being an array? The idea is to have a User table and another ShoppingList table, so the user can have multiple lists at the same time.

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Answer

This would be the correct way:

One Employee has many ShoppingLists.

One ShoppingList has only one Employee.

@Entity
public class Employee implements Serializable {
    ....

    @OneToMany(mappedBy = "employee", fetch = FetchType.LAZY,
            cascade = CascadeType.ALL)
    private List<ShoppingList> shoppingList;

    ....
}
@Entity
public class ShoppingList implements Serializable {
    ....
    
    @ManyToOne(fetch = FetchType.LAZY, optional = false)
    @JoinColumn(name = "employee_id", nullable = false)
    private Employee employee;

   ....
}

You can fine-tune your entities as per your need. For more info, I would refer to this tutorial, it has helped me a lot.

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