@SessionAttributes and method @ModelAttribute

[nicolas.loriente]

Cannot create a session after the response has been committed

Hi everyone,

I've been having some issues getting @SessionAttributes and method level @ModelAttribute working together.
Also, I'm open to suggestions for better/cleaner solutions if there is.

I have a parent controller that looks like this:

@Controller
@SessionAttributes("userDefaults")
public class ParentController {	
	
        @Resource(name="userService")
        private UserService userService;

	@ModelAttribute("userDefaults")
	public UserDefaults getUserDefaults(@ModelAttribute("userDefaults")UserDefaults userDefaults) {
		// grab userDefaults from Model
                // if not initialized initialize it
                // return either the existing or new userDefaults to make it part of the model
               // make it a session attribute

		if (userDefaults.getSomeDefaultValue() == null) {
			userDefaults = userService.getUserDefaults();
		}
		
		return userDefaults;
	}
        .......
}

Parent controller has other methods with @InitBinder, @ExceptionHandler, etc. that are common to all my controllers.

And my child controller looks something like this:

@Controller
public class SomeChildController extends ParentController {
	
	@RequestMapping(value="/someMapping", method=RequestMethod.GET)
	public String getUser(@ModelAttribute("userDefaults") User userDefaults) {
                
                // use userDefaults to retrieve data
                .........
		return "userForm";
	}
}

What am I trying to achieve???? Basically, I want to set "userDefaults" on the session before any @RequestMapping happens so that handler methods can use this session bounded "userDefaults"

I've tried many combinations but couldn't make it work and I keep getting:

SEVERE: Servlet.service() for servlet [appServlet] in context with path [/IGCService] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: Cannot create a session after the response has been committed] with root cause
java.lang.IllegalStateException: Cannot create a session after the response has been committed

By the way.... I do get my response rendered correctly on my view but right after that I get the error as somehow a new session is trying to be created. I'm not seeing why or how or where a new session would be want to be created after the response has been committed.

Thanks.

Any help on this or recommendation is very appreciated.

Thanks,


nicolas.loriente