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

Two ways to make this work

override compareTo method as

@Entity(name = "PERSON")
public class Person implements Comparable{
 //... all your attributes goes here
 private Integer id;

 @Override
public int compareTo(Person person) {
   return this.getId().compareTo(person.getId());
}} 

or

you need to override equals and hashcode methods in your entity class as below

 @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();
}