Ciao a tutti sto cercando di creare un programma che crei due liste dinamicamente, sfortunatamente la seconda non sta funzionando (probabilmente perch� non ho molto capito i metodi get e post)
Potreste spiegarmi perch�?

Ecco il mio controller
codice:
@Controller
@RequestMapping(value = "/")
public class ConfigController {


    


    @RequestMapping(value = "home", method = RequestMethod.GET)
    public String saveNum(Model model) {
        model.addAttribute("configuration", new Config());
        return "home";
    }


    @RequestMapping(value = "home", method = RequestMethod.POST)
    public String saveNumPost(@ModelAttribute(value = "configuration") Config config, Model model) {
        List<Driver> drivers = new ArrayList<Driver>();
        for (int i = 0; i < config.getDriversNum(); i++) {
            drivers.add(new Driver());
        }
        Championship championship = new Championship();
        championship.setDrivers(drivers);
        model.addAttribute("championship", championship);
        return "configDrivers";
    }


    @RequestMapping(value = "configDrivers", method = RequestMethod.GET)
    public String saveDriverList() {
        return "redirect:/configDrivers";
    }


    @RequestMapping(value = "configDrivers", method = RequestMethod.POST)
    public String printDrivers(@ModelAttribute Config config, Championship championship, Model model) {
        for(int i = 0; i < config.getDriversNum(); i++){
            System.out.println(championship.getDrivers().get(i));
        }
        return "configCars";
    }
    


    @RequestMapping(value = "configCars", method = RequestMethod.GET)
    public String saveCars(/* Model model */) {
        
        return "configCars";
    }
    
      @RequestMapping(value = "configCars", method = RequestMethod.POST) 
      public String saveCarsPost(@ModelAttribute(value = "configuration") Config config, Model model) { 
          List<Car> cars = new ArrayList<Car>(); 
          for (int i= 0; i < config.getDriversNum(); i++) { 
              cars.add(new Car()); 
          }
      Championship championship = new Championship();
      championship.setCars(cars); 
      model.addAttribute("championship",championship);
      
     return "configTracks"; 
     }
     
}
la view home
codice:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ page session="false" %>




<html>
<head>
    <title>Home</title>
</head>
<body>
<h1>
    Welcome to Formula 1 simulator 
</h1>


    
        <c:url var="url" value="/home"/>
        <form:form action="${url}" method="POST" modelAttribute="configuration">
            <label>Insert number of drivers:</label> <br> 
            <form:input path="driversNum" placeholder="Type drivers number"/>
            <br>
            <input type="submit" />
            <!--number races-->
        </form:form>
    
</body>
</html>
la view configDrivers

codice:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ page session="false" %>




<html>
<head>
    <title>Configuration</title>
</head>
<body>
<h1>
    World championship Configuration
</h1>


    
        <c:url var="url" value="/configDrivers"/>
        
        <form:form action="${url}" method="POST" modelAttribute="championship">
            
            <label>Insert drivers:</label> 
            
            <c:forEach items="${championship.drivers}" var="driver" varStatus="i">
                <h3>Insert driver's name and surname of driver ${i.index} </h3>
                <form:input path="drivers[${i.index}].name" value="${driver.name}" placeholder="Type name here" />
                <br>
                <form:input path="drivers[${i.index}].surname" value="${driver.surname}" placeholder="Type surname here" />
                <br>
            </c:forEach>    
                <input type="submit" />
                <!--number races-->
        </form:form>
    
    
    
        
    
        
</body>
</html>
e la view configCars

codice:
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<%@ page session="false" %>




<html>
<head>
    <title>Cars Configuration</title>
</head>
<body>
<h1>
    Cars configuration
</h1>


    
        <c:url var="url" value="/configCars"/>
        
        <form:form action="${url}" method="POST" modelAttribute="championship">
            
            <label>Insert cars:</label> 
            
            <c:forEach items="${championship.cars}" var="car" varStatus="i">
                <h3>Insert driver's team ${i.index} </h3>
                <form:input path="cars[${i.index}].team" value="${car.team}" placeholder="Type team here" />
                <br>
            </c:forEach>    
            
            
            
                <input type="submit" />
                <!--number races-->
        </form:form>
    
        <select>
              <c:forEach items="${championship.drivers}" var="car" varStatus="i">
                  <option value="${i.index}">${driver.name}</option>
              </c:forEach>
            </select>
    
        
    
        
</body>
</html>