Package lombok

Annotation Type NoArgsConstructor


@Target(TYPE)
@Retention(SOURCE)
public @interface NoArgsConstructor
Generates a no-args constructor. Will generate an error message if such a constructor cannot be written due to the existence of final fields.

Complete documentation is found at the project lombok features page for @Constructor.

Even though it is not listed, this annotation also has the onConstructor parameter. See the full documentation for more details.

NB: Fields with constraints such as @NonNull will NOT be checked in a @NoArgsConstructor constructor, of course!

See Also:
RequiredArgsConstructor, AllArgsConstructor
  • Optional Element Summary

    Optional Elements 
    Modifier and Type Optional Element Description
    AccessLevel access
    Sets the access level of the constructor.
    boolean force
    If true, initializes all final fields to 0 / null / false.
    NoArgsConstructor.AnyAnnotation[] onConstructor
    Any annotations listed here are put on the generated constructor.
    java.lang.String staticName
    If set, the generated constructor will be private, and an additional static 'constructor' is generated with the same argument list that wraps the real constructor.
  • Element Details

    • staticName

      java.lang.String staticName
      If set, the generated constructor will be private, and an additional static 'constructor' is generated with the same argument list that wraps the real constructor. Such a static 'constructor' is primarily useful as it infers type arguments.
      Returns:
      Name of static 'constructor' method to generate (blank = generate a normal constructor).
      Default:
      ""
    • onConstructor

      Any annotations listed here are put on the generated constructor. The syntax for this feature depends on JDK version (nothing we can do about that; it's to work around javac bugs).
      up to JDK7:
      @NoArgsConstructor(onConstructor=@__({@AnnotationsGoHere}))
      from JDK8:
      @NoArgsConstructor(onConstructor_={@AnnotationsGohere}) // note the underscore after onConstructor.
      Returns:
      List of annotations to apply to the generated constructor.
      Default:
      {}
    • access

      AccessLevel access
      Sets the access level of the constructor. By default, generated constructors are public.
      Returns:
      The constructor will be generated with this access modifier.
      Default:
      PUBLIC
    • force

      boolean force
      If true, initializes all final fields to 0 / null / false. Otherwise, a compile time error occurs.
      Returns:
      Return true to force generation of a no-args constructor, picking defaults if necessary to assign required fields.
      Default:
      false