Annotation Interface NotNull


An element annotated with NotNull claims null value is forbidden to return (for methods), pass to (parameters) and hold (local variables and fields). Apart from documentation purposes this annotation is intended to be used by static analysis tools to validate against probable runtime errors and element contract violations.
  • Element Details

    • value

      String value
      Returns:
      Custom exception message
      Default:
      ""
    • exception

      Class<? extends Exception> exception
      Returns:
      Custom exception type that should be thrown when not-nullity contract is violated. The exception class should have a constructor with one String argument (message). By default, IllegalArgumentException is thrown on null method arguments and IllegalStateException — on null return value.
      Default:
      java.lang.Exception.class