What is @NoArgsConstructor used for?

@NoArgsConstructor generates a public, no-argument constructor for the class — useful for frameworks that require a default constructor to instantiate objects via reflection, such as JPA entities or JSON deserialization libraries like Jackson.

@NoArgsConstructor
public class Person {
    private String name;
    private int age;
}
//  generates: public Person() {}

If the class has final fields without default values, Lombok can't generate a truly empty constructor that leaves them properly initialized, and will either fail or require the force = true option, which initializes those fields to their default value (0, false, or null) inside the generated constructor.

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