Urgently need help about SessionAttributes ?? Can't get it work

[ivanyiu]

I have a controller which extend the class ControllerBase.

Declare a SessionAttributes by annontation

@Controller
@SessionAttributes(value = { "account", "action", "group", "groups", "groupUserMap", "notGroupUserMap" })
@SuppressWarnings("unchecked")
public class GroupController extends ControllerBase {

A method declaration

@RequestMapping(value = "/group/list", method = RequestMethod.GET)
	public String list(@RequestParam(required = false) String[] messages, @ModelAttribute Account account, Model model,
			Locale locale) {

At the end of the above method, the following attribute are put to model.

model.addAttribute("groups", groups);
model.addAttribute("defaultGroup", defaultgroup);

Another method in the same controller.

public String prepareAdd(@RequestParam(required = false) String groupName, @ModelAttribute Account account,
			Model model, Locale locale) throws IOException {

At the end of this method, it return to another view and need to access the previous defined model attribute "group" and "defaultgroup". But I found that the attribute are not there anymore. I put some debut code inside the method prepareAdd, iterate the model map and print out the entry set, and found that the group and defaultgroup entry are already cleared.

I really don't understand why the SessionAttributes is not working. Anything I do wrong? Any hint how to use the SessionAttributes correctly?

The software is written by others, and I'm very new to Spring, your advice would be very helpful .

[dr_pompeii]

Hello

I really don't understand why the SessionAttributes is not working. 
Anything I do wrong? Any hint how to use the SessionAttributes correctly?

OK, just an observation, below

@SessionAttributes(value = { "account", "action", "group", "groups", "groupUserMap", "notGroupUserMap" })

no appear or is not declared defaultGroup, where below you are referring

model.addAttribute("groups", groups);
model.addAttribute("defaultGroup", defaultgroup);

At the end of this method, it return to another view and need to access the previous defined model attribute "group" and "defaultgroup". But I found that the attribute are not there anymore. I put some debut code inside the method prepareAdd, iterate the model map and print out the entry set, and found that the group and defaultgroup entry are already cleared.

If you could post the complete method implementation would be better, I hope in other method of your controller you are not clearing the Session, like status.setComplete();

[ivanyiu]

Thanks Jordon,

Just find out that the previous insert a session.invalidate() statement in a method. I track down the session ID and fond that it's update during the navigation. Dig into the code and found that invalid statement. Problem already solved.

Thanks anyway.