How to redirect from one controller method to another method with model data in spring boot application - spring

Question

In this example I am trying to redirect from handleSaveContact() controller method from contactSuccessMsg() controller method but after transfer I need to display success or update or failure msg to the UI which is only possible if I transfer Model data from 1st method to 2nd.
Could any one please suggest me how I can trasfer model data from one controller method to another controller method.
#GetMapping(value={"/", "/loadForm"})
public String loadContactForm(Model model) {
model.addAttribute("contact", new Contact());
return "index";
}
#PostMapping("/saveContact")
public String handleSaveContact(Contact contact, Model model) {
String msgTxt = null;
if(contact.getContactId()==null) {
msgTxt = "Contact Saved Successfully..!!";
}else {
msgTxt = "Contact Updated Successfully..!!";
}
contact.setIsActive("Y");
boolean isSaved = contactService.saveContact(contact);
if(isSaved) {
model.addAttribute("successMsg", msgTxt);
}else {
model.addAttribute("errorMsg", "Failed To Save Contact..!!");
}
return "redirect:/contactSuccessMsg";
}
/**
* To resolve Double Posting problem, redirecting the post req method to get request.
* #param contact
* #param model
* #return
*/
#GetMapping(value="/contactSuccessMsg")
public String contactSuccessMsg(Model model) {
model.addAttribute("contact", new Contact());
return "index";
}

Answer 1

I used Spring 3.2.3
1.)Added RedirectAttributes redirectAttributes to the method parameter list in controller1.
public String controlMapping1(
#ModelAttribute("mapping1Form") final Object mapping1FormObject,
final BindingResult mapping1BindingResult,
final Model model,
final RedirectAttributes redirectAttributes)
Inside the method added code to add flash attribute to redirectAttributes
redirectAttributes.addFlashAttribute("mapping1Form", mapping1FormObject);
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";
}