how to update an entity with spring data jpa

Question

I have an entity and a Junit, I want to test that update method is working fine, but when I invoke save method from CrudRepository I get a new entry in my table instead of the u

Answer 1

You must implement equals() and hashCode() in class Person.

@Entity(name = "PERSON")
public class Person {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "PERSON_ID")
    private Integer id;
    @Column(name = "FIRST_NAME")
    private String firstName;
    @Column(name = "LAST_NAME")
    private String lastName;
    //getters and setters

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (id == null || obj == null || getClass() != obj.getClass())
            return false;
        Person that = (Person) obj;
        return id.equals(that.id);
    }
    @Override
    public int hashCode() {
        return id == null ? 0 : id.hashCode();
    }
}