code: public <TArg0> StateConfiguration<S, T> onEntryFrom(TriggerWithParameters1<TArg0, T> trigger, final Action1<TArg0> entryAction) {
          assert entryAction != null : ENTRY_ACTION_IS_NULL;
          return onEntryFrom(trigger, new Action2<TArg0, Transition<S, T>>() {
              @Override
              public void doIt(TArg0 arg1, Transition<S, T> arg2) {
                  entryAction.doIt(arg1);
              }
          });
      }
docs: Specify an action that will execute when transitioning into the configured state
  
  @param trigger     The trigger by which the state must be entered in order for the action to execute
  @param entryAction Action to execute, providing details of the transition
  @param <TArg0>     Type of the first trigger argument
  @return The receiver