Java/Spring | Unknown return value type: java.lang.Integer

Error

Unknown return value type [java.lang.Integer]

Java 서버와 Ajax 호출 시 에러

 

Solution Content

@ResponsBody 누락
: 리턴되는 값은 view 를 통해서 출력되지 않고 HTTP ResponseBody 에 직접 쓰여지게 됨.

 

Before

@RequestMapping(value = "/test.do", method = RequestMethod.POST)
public int test(HttpServletRequest request, @ModelAttribute VO vo) throws Exception {
    int testCnt = testService.testCnt(vo);
    
    return testCnt;
}

 

After

@ResponseBody
@RequestMapping(value = "/test.do", method = RequestMethod.POST)
public int test(HttpServletRequest request, @ModelAttribute VO vo) throws Exception {
    int testCnt = testService.testCnt(vo);
    
    return testCnt;
}