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

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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";  
}

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