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我的@Controller 中有这样的方法签名 

@RequestMapping("/saveCandidate")
        public String saveCandidate(Model model,
                @ModelAttribute("candidateFromRequest") Candidate candidateFromRequest,
                @ModelAttribute("skillsIdList") Set<Skill> skills,
                @ModelAttribute("vacanciesForCandidate") Set<Vacancy> vacanciesForCandidate)

等形式：

<form action="saveCandidate"  id="formId" method="POST">
....
<input type="submit" value="save changes"/>
</form>

在调试中，我看到所有 @ModelAttribute 实体都按要求提出。

为什么结果我看到

客户端发送的请求在语法上不正确。HTTP 状态 400 -

在我的浏览器中

代码：

@ModelAttribute(value = "candidateFromRequest")
    public Candidate loadCandidateById(@RequestParam(required = false) Integer id) {
        if (id!= null)
            return candidateService.findById(id);
        return null;
    }

@ModelAttribute(value = "skillsIdList")
    public Set<Skill> getSkillListById(@RequestParam(required = false) List<Integer> skills,@ModelAttribute("skills")List<Skill> allSkills ) {
        if (skills== null)
            return null;
        Set<Skill> returnList = new  HashSet<Skill>();
        for(Integer skillId:skills){
            for(Skill skill:allSkills){
                if(skillId.equals(skill.getId())){
                    returnList.add(skill);
                    break;
                }
            }   
        }
        return returnList;
    }

@ModelAttribute(value = "vacanciesForCandidate")
public Set<Vacancy> vacanciesForCandidate(@RequestParam(required = false) 

List<Integer> vacancies,@ModelAttribute("vacancies")List<Vacancy> allVacancies ) {
        if (vacancies== null)
            return null;
        Set<Vacancy> returnList = new  HashSet<Vacancy>();
        for(Integer vacancyId:vacancies){
            for(Vacancy vacancy:allVacancies){
                if(vacancyId.equals(vacancy.getId())){
                    returnList.add(vacancy);
                    break;
                }
            }   
        }
        return returnList;
    }

在调试中我看到，上面写的方法返回有效值。

我将方法替换为 GET 并查看浏览器请求：

http://localhost:8080/ui/saveCandidate?name=Evgeniy&surname=Rogachev&phone=02&resumeUrl=http%3A%2F%2Fgoogle.com&id=1013&skills=2&skills=3&skills=4&skills=5&skills=6&skills=7&skills=8&vacancies=6&vacancies=12&vacancies=14
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