code: public StateConfiguration<S, T> onExit(final Action exitAction) {
          assert exitAction != null : EXIT_ACTION_IS_NULL;
          return onExit(new Action1<Transition<S, T>>() {
              @Override
              public void doIt(Transition<S, T> arg1) {
                  exitAction.doIt();
              }
          });
      }
docs: Specify an action that will execute when transitioning from the configured state
  
  @param exitAction Action to execute
  @return The receiver