How do I prevent Spring 3.0 MVC @ModelAttribute variables from appearing in URL?

Question

Using Spring MVC 3.0.0.RELEASE, I have the following Controller:

@Controller @RequestMapping("/addIntake.htm") public class AddIntakeController{    private final Collection<String> users;    public AddIntakeController(){     users = new ArrayList<String>();     users.add("user1");     users.add("user2");     // ...     users.add("userN");   }    @ModelAttribute("users")   public Collection<String> getUsers(){     return this.users;   }    @RequestMapping(method=RequestMethod.GET)   public String setupForm(ModelMap model){      // Set up command object     Intake intake = new Intake();     intake.setIntakeDate(new Date());     model.addAttribute("intake", intake);      return "addIntake";   }    @RequestMapping(method=RequestMethod.POST)   public String addIntake(@ModelAttribute("intake")Intake intake, BindingResult result){      // Validate Intake command object and persist to database     // ...      String caseNumber = assignIntakeACaseNumber();      return "redirect:intakeDetails.htm?caseNumber=" + caseNumber;    }  } 

The Controller reads Intake information from a command object populated from an HTML form, validates the command object, persists the information to the database, and returns a case number.

Everything works great, except for when I redirect to the intakeDetails.htm page, I get a URL that looks like this:

http://localhost:8080/project/intakeDetails.htm?caseNumber=1&users=user1&users=user2&users=user3&users=user4...

How do I prevent the user Collection from showing up in the URL?

Answer 1

model.asMap().clear(); return "redirect:" + news.getUrl(); 

:)

Answer 2

Since spring 3.1 the RequestMappingHandlerAdapter provides a flag called ignoreDefaultModelOnRedirectthat you can use to prevent using the content of the defautl model if the controller redirects.