CODEWITHSUNDEEP
javajspspring-mvcservletshttp-redirect
Nish
Nish

Reputation: 31

Loss of @SessionAttribute when redirecting in SpringMVC

I am faced with a peculiar problem. I am learning SpringMVC and this is my first application project with it.

When we use @SesssionAttributes annotation in a controller, the session attribute is automatically updated, if any handler method having a @ModelAttribute argument with the same name as a @SessionAttribute in its signature is invoked.

now i redirected the control to another handler mathod which in turn renders a jsp. The problem I am facing is that I am able to access the @SessionAttribute in the redirected handler method but in the jsp it renders the session attribute is lost.

Here is the code. 

@Controller
@EnableWebMvc
@RequestMapping("/courtreservation/*")
@SessionAttributes("courtDetails")
public class ControllerServlet {



@RequestMapping(value="basePage",method=RequestMethod.GET)
public String basePageRenderer(Model model,HttpServletRequest request){
CourtDetails tempObj = (CourtDetails)request.getSession().getAttribute("courtDetails");        
 GenericXmlApplicationContext context = new GenericXmlApplicationContext();
    context.load("configs/applicationContext.xml");
    context.refresh();
    CourtDetails courtDetails = (CourtDetails)context.getBean("courtDetails");
    List<String> allSports = courtDetails.getAllSports();
    Calendar calendar = Calendar.getInstance();
    int numDay = calendar.get(Calendar.DAY_OF_WEEK);
    System.out.println(numDay);
    String[] days = {"sunday","monday","tuesday","wednesday","friday","saturday","sunday"};
    /*List<String> daysAvailableForReservation = new ArrayList<>();
    if(numDay == 1) {
        for(String day:days) {
            daysAvailableForReservation.add(day);
        }
    }
    else {
       for(int i=numDay--;i<days.length;i++) {
           daysAvailableForReservation.add(days[i]);
       }
    }*/
    model.addAttribute("daysAvailableForReservation", days);
    model.addAttribute("courtDetails", courtDetails);
    model.addAttribute("allSports",allSports);
    return "welcomePage";
}

@RequestMapping(value="checkAvailability",method=RequestMethod.POST)
public String checkAvailability(CourtDetails courtDetails,HttpServletRequest request,HttpServletResponse response,Model model) {
    HttpSession session = request.getSession();
    courtDetails = (CourtDetails)session.getAttribute("courtDetails");
    Boolean isAvailable = courtDetails.checkAvailability();
    if(isAvailable) {
        model.addAttribute("isAvailable","true");
        model.addAttribute("courtDetails",courtDetails);
        return "welcomePage";
    }
    model.addAttribute("isAvailable", "false");
    model.addAttribute("courtDetails",courtDetails);
    return "unavailable";
}






}

After the redirect from checkAvailability the @SessionAttribute("courtDetails") is available in the basePageRenderer() but not in the jsp it renders which is welcomePage.jsp.

here are the view resolution configs.

1) Controller servlet config:

<bean class="org.springframework.web.servlet.view.XmlViewResolver" 
          p:location="/WEB-INF/classes/configs/appViews.xml" 
          p:order="0" />

2) appView.xml

<bean id="unavailable"
      class="org.springframework.web.servlet.view.RedirectView"
      p:url="/Sports_Reservation/courtreservation/basePage"  />

Upvotes: 1

Views: 3466

Answers (2)

Neil McGuigan
Neil McGuigan

Reputation: 48287

Change your second handler to be like this:

@RequestMapping(value="checkAvailability",method=RequestMethod.POST)
public String checkAvailability(
    @ModelAttribute("courtDetails") CourtDetails courtDetails,
    HttpServletRequest request,
    HttpServletResponse response,
    Model model
)

This will read the modelAttribute from session and then set the values from the post. You don't need to manually read the value from session.

Upvotes: 0

Sanjay
Sanjay

Reputation: 8975

It seems to be well explained here. I had similar issue, and ended up using forward instead of redirect.

Upvotes: 1

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