Controller

@RequestMapping(value="/createAnswer", method = RequestMethod.GET)
public String getCreateNewAnswer(@RequestParam("id") String exerciseId, Model model){
	String userId = "U1";
	model.addAttribute("exercise", exerciseService.getExerciseById(exerciseId));
	Answer newAnswer = new Answer(exerciseId, userId);
	model.addAttribute("newAnswer", newAnswer);
	return "addAnswer";
}


@RequestMapping(value="/createAnswer", method = RequestMethod.POST)
public String processCreateNewAnswer(@RequestParam("id") String exerciseId, @ModelAttribute("newAnswer") @Valid Answer newAnswer , BindingResult result, Model model) {
	//model.addAttribute("addAnswer", exerciseService.getExerciseById(exerciseId));
	String[] suppressedFields = result.getSuppressedFields();
	if(suppressedFields.length > 0){
		throw new RuntimeException("Próba wiązania bla ... blaaa... blaa");
	}
	if(result.hasErrors()){
		return "addAnswer";
	}
	answerService.addAnswer(newAnswer);
	return "redirect:/exercises";
}