java - 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();

:)