@GetMapping("/goToViewPage")
public ModelAndView passParametersWithModelAndView() {
    ModelAndView modelAndView = new ModelAndView("viewPage");
    modelAndView.addObject("message", "Baeldung");
    return modelAndView;
}

        

@RequestMapping(value = "/", method = RequestMethod.GET)
public ModelAndView getdata() {

	List<String> list = getList();

	//return back to index.jsp
	ModelAndView model = new ModelAndView("index");
	model.addObject("lists", list);

	return model;

}

        

ModelAndView model = new ModelAndView("employeeDetails");
model.addObject("employeeObj", new EmployeeBean(123));
model.addObject("msg", "Employee information.");
return model;

        

@GetMapping("/getMessage2")
public ModelAndView getMessage() {

    var mav = new ModelAndView();
    mav.addObject("message", message);
    mav.setViewName("show");

    return mav;
}

        

public class UserController extends MultiActionController{
	
   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("home");
      model.addObject("message", "Home");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Add");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Remove");
      return model;
   }
}

        

@ExceptionHandler(Throwable.class)
@ResponseStatus(HttpStatus.INTERNAL_SERVER_ERROR)
public ModelAndView exception(final Throwable throwable, final Model model) {
    logger.error("Exception during execution of SpringSecurity application", throwable);
    StringBuffer sb = new StringBuffer();
    sb.append("Exception during execution of Spring Security application!   ");

    sb.append((throwable != null && throwable.getMessage() != null ? throwable.getMessage() : "Unknown error"));

    if (throwable != null && throwable.getCause() != null) {
        sb.append(" root cause: ").append(throwable.getCause());
    }
    model.addAttribute("error", sb.toString());

    ModelAndView mav = new ModelAndView();
    mav.addObject("error", sb.toString());
    mav.setViewName("error");

    return mav;
}

        

@RequestMapping(value = "/registration", method = RequestMethod.POST)
public ModelAndView createNewUser(@Valid User user, BindingResult bindingResult) {
	ModelAndView modelAndView = new ModelAndView();
	User userExists = userService.findUserByEmail(user.getEmail());
	if (userExists != null) {
		bindingResult.rejectValue("email", "error.user",
				"There is already a user registered with the email provided");
	}
	if (bindingResult.hasErrors()) {
		modelAndView.setViewName("registration");
	} else {
		userService.saveUser(user);
		modelAndView.addObject("successMessage", "User has been registered successfully");
		modelAndView.addObject("user", new User());
		modelAndView.setViewName("registration");

	}
	return modelAndView;
}

        

@ExceptionHandler(ProductNotFoundException.class)
public ModelAndView handleError(HttpServletRequest req, ProductNotFoundException exception) {
    ModelAndView mav = new ModelAndView();
    mav.addObject("invalidProductId", exception.getProductId());
    mav.addObject("exception", exception);
    mav.addObject("url", req.getRequestURL()+"?"+req.getQueryString());
    mav.setViewName("productNotFound");
    return mav;
}

        

@GetMapping(value = "/login")
public ModelAndView login(
        @RequestParam(value = "error", required = false) String error,
        @RequestParam(value = "logout", required = false) String logout) {

    logger.info("******login(error): {} ***************************************", error);
    logger.info("******login(logout): {} ***************************************", logout);

    ModelAndView model = new ModelAndView();
    if (error != null) {
        model.addObject("error", "Invalid username and password!");
    }

    if (logout != null) {
        model.addObject("message", "You've been logged out successfully.");
    }
    model.setViewName("login");

    return model;
}

        

@RequestMapping(value = "/newPost", method = RequestMethod.GET)
public ModelAndView newPost(Principal principal) {
    ModelAndView modelAndView = new ModelAndView();
    User user = userService.findByUsername(principal.getName());
    Post post = new Post();
    post.setUser(user);
    modelAndView.addObject("post", post);
    modelAndView.setViewName("postForm");
    return modelAndView;
}