java - The request sent by the client was syntactically incorrect. HTTP Status 400 - -

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i have method signature in @controller 

@requestmapping("/savecandidate")         public string savecandidate(model model,                 @modelattribute("candidatefromrequest") candidate candidatefromrequest,                 @modelattribute("skillsidlist") set<skill> skills,                 @modelattribute("vacanciesforcandidate") set<vacancy> vacanciesforcandidate)

and form:

<form action="savecandidate"  id="formid" method="post"> .... <input type="submit" value="save changes"/> </form>

in debug see, @modelattribute entities put on request.

why result see

the request sent client syntactically incorrect. http status 400 -

in browser

code:

@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;     }

in debug saw, methods, writes above return valid values.

i replace mehod , saw browser request:

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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