CODEWITHSUNDEEP
hibernateimmutability
Kevin Meredith
Kevin Meredith

Reputation: 41919

Making an Entity's Field Immutable

In my Person entity, let's say I'd like to make an immutable field - name.

@Entity
public class Person {
  @Id
  private Long id; 

  @Column(name = "name")
  private String name;

  public Person() {} // no-args constructor for Hibernate

  // getter for id and name fields
}

As I understand, the following is good enough for Hibernate to retrieve a person based on an id look-up - it'll use Hibernate's setters for the id and name.

But, if I want to create a new Person with an immutable name field, how would I need to change the above code?

Upvotes: 0

Views: 109

Answers (1)

Jeff
Jeff

Reputation: 3707

Add a constructor that takes a name arg. The no-arg constructor needs to exist for Hibernate, but it doesn't need to be public. Force calling code to use the constructor with name arg.

Or use a static Builder class which would be able to directly set private field; but that seems like overkill in this case.

Upvotes: 2

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