How to pass model attributes from one Spring MVC controller to another controller?

Question

I am redirecting from a controller to another controller. But I also need to pass model attributes to the second controller.

I don't want to put the model in session.

Please help.

Answer 1

I use spring 3.2.3 and here is how I solved similar problem.
1) Added RedirectAttributes redirectAttributes to the method parameter list in controller 1.

public String controlMapping1(         @ModelAttribute("mapping1Form") final Object mapping1FormObject,         final BindingResult mapping1BindingResult,         final Model model,          final RedirectAttributes redirectAttributes) 

2) Inside the method added code to add flash attribute to redirectAttributes redirectAttributes.addFlashAttribute("mapping1Form", mapping1FormObject);

3) Then, in the second contoller use method parameter annotated with @ModelAttribute to access redirect Attributes

@ModelAttribute("mapping1Form") final Object mapping1FormObject 

Here is the sample code from Controller 1:

@RequestMapping(value = { "/mapping1" }, method = RequestMethod.POST) public String controlMapping1(         @ModelAttribute("mapping1Form") final Object mapping1FormObject,         final BindingResult mapping1BindingResult,         final Model model,          final RedirectAttributes redirectAttributes) {      redirectAttributes.addFlashAttribute("mapping1Form", mapping1FormObject);      return "redirect:mapping2"; }    

From Contoller 2:

@RequestMapping(value = "/mapping2", method = RequestMethod.GET) public String controlMapping2(         @ModelAttribute("mapping1Form") final Object mapping1FormObject,         final BindingResult mapping1BindingResult,         final Model model) {      model.addAttribute("transformationForm", mapping1FormObject);      return "new/view";   } 

Answer 2

Using just redirectAttributes.addFlashAttribute(...) -> "redirect:..." worked as well, didn't have to "reinsert" the model attribute.

Thanks, aborskiy!