code: public static void checkNotNullState(Object object, String message, Object... args) {
      checkState(object != null, message, args);
    }
docs: Checks that {@code object} is not null.
  
  @param  object  the object that cannot be null
  @param  message the error message if {@code condition} is false
  @param  args    the arguments to the error message
  
  @throws IllegalStateException if {@code object} is null