Troubles with SpringMVC

[Arhat]

Hello.
I need to realize the next scheme:

1. There is an action FindFlightsController, that executes a searching of airplane flights.

public class FindFlightsController extends BaseFormController {

  protected Object formBackingObject(HttpServletRequest request) throws Exception {
    FlightRequestImpl flightRequest = new FlightRequestImpl();
    flightRequest.setHasReturnFlight(true);
    return flightRequest;
  }

  protected Map referenceData(HttpServletRequest request) throws Exception {
    Collection cabinClasses = new ArrayList();
    cabinClasses.add(ReservationService.ECONOMY_CLASS);
    cabinClasses.add(ReservationService.BUSINESS_CLASS);
    Map model = new HashMap();
    model.put(WebAppConstants.CABIN_CLASSES_PARAM, cabinClasses);
    return model;
  }

  public ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception {

    Map model = new HashMap();

    FlightRequest flightRequest = (FlightRequest) command;

    Collection  flights = getReservationService().getFlights(flightRequest);
      if&#40;null == flights || flights.size&#40;&#41; < 1&#41; &#123;
      	return new ModelAndView&#40;WebAppConstants.FLIGHT_NOT_FOUND_VIEW&#41;;
      &#125;
    model.put&#40;WebAppConstants.FLIGHTS_PARAM, flights&#41;;

    return new ModelAndView&#40;getSuccessView&#40;&#41;, model&#41;;
  &#125;
&#125;

It has next mapping:

  <bean id="findFlightsController" class="FindFlightsController">
    <property name="sessionForm"><value>true</value></property>
    <property name="commandName"><value>flightRequest</value></property>
    <property name="commandClass"><value>FlightRequestImpl</value></property>
    <property name="successView"><value>forward&#58;ReserveFlight.htm</value></property>
    <property name="formView"><value>FlightRequest</value></property>
    <property name="validator"><bean class="FlightRequestValidator"/></property>
    <property name="reservationService"><ref bean="reservationService"/></property>
  </bean>

2. After ending of this action the page ViewFlights.jsp must be screened with founded flights. On the page it is necessary to select a flight and to reserve boarding seats in the flight.

    <form action="<c&#58;url value="/ReserveFlight.htm"/>" method="POST">
      <h1>Avaible flights</h1>
      <spring&#58;bind path="flightReservation.flight">
        <span class="fieldError"><c&#58;out value="$&#123;status.errorMessage&#125;"/></span>
        <c&#58;forEach items="$&#123;flights&#125;" var="flight">
          <input type="radio" name="<c&#58;out value="$&#123;status.expression&#125;"/>" value="<c&#58;out value="$&#123;flight.flightCode&#125;" />" <c&#58;if test="$&#123;status.value eq flight.flightCode&#125;" >checked</c&#58;if>>
        </c&#58;forEach>
      </spring&#58;bind>
      <a href="javascript&#58;history.back&#40;&#41;;">back</a>      
      <input type="submit">
    </form>

3. Seat reserving realizes ReserveFlightController.

public class ReserveFlightController  extends BaseFormController {

  protected Object formBackingObject(HttpServletRequest request) throws Exception {
    return new FlightReservation();
  }

  public ModelAndView onSubmit(HttpServletRequest request, HttpServletResponse response, Object command, BindException errors) throws Exception {

    FlightReservation flightReservation = (FlightReservation) command;
    Flight flight = getReservationService().reserveFlight(flightReservation.getFlight());

    Map model = new HashMap();
    model.put(WebAppConstants.RESERVED_FLIGHT_PARAM, flight);
    return new ModelAndView(getSuccessView(), model);
  }
}

It has mapping:

  <bean id="reserveFlightController" class="ReserveFlightController">
    <property name="commandName"><value>flightReservation</value></property>
    <property name="commandClass"><value>FlightReservation</value></property>
    <property name="successView"><value>ReviewBooking</value></property>
    <property name="formView"><value>ViewFlights</value></property>
    <property name="validator"><bean class="FlightReservationValidator"/></property>
    <property name="reservationService"><ref bean="reservationService"/></property>
  </bean>

When a user made no selection and clicked the button ?Submit? the program has to screen error message and to show a list of free flights.

4. It should be screened a page with information about reserved flight.

5. It can be executed a jump to the start of searching with the link ?Back?.

And now some problems:
1. After ending of the action FindFlightsController it must be executed a forward to ReserveFlightController and screened a page ViewFlights.jsp. Right now a validation is made and it screens a message about selecting of no one flight, although it is just first page screening.
The question: how it can be corrected?

2. If you click ?Submit? after that without flight selection, the list of finding flights will be lost.
The question: how to avoid it?

3. When we?ll try to come back with the link javascript:history.back(), then we?ll find themselves at the page ViewFlights.jsp instead the page of flight searching.
The question: how we can to realize a correct return with saving of previous forms condition?[/code]