[Spring Boot] template might not exist or might not be accessible by any of the configured template resolvers 오류 해결

Thymeleaf를 사용하고 Javascript로 Ajax 통신 중 다음과 같은 에러가 발생했다.

template might not exist or might not be accessible by any of the configured template resolvers ...

$.ajax({
            method:'POST',
            url:'/getLocationData',
            dataType:'json',
            success:function (data){
                console.log("data:::"+data);
            }
        })

@Controller
public class LocationController {
    @Autowired
    private LocationService locationService;

    @PostMapping("/getLocationData")
    public HashMap<String, Object> getLocationData(){
        return locationService.getLocationData();
    }

}

원인 : @RestController가 아닌 @Controller를 이용해서 getLocationData()의 리턴값을 View값에 매칭하려고 해서 Template 매칭 오류가 발생

@Controller
public class LocationController {
    @Autowired
    private LocationService locationService;

    @PostMapping("/getLocationData")
    public @ResponseBody HashMap<String, Object> getLocationData(){
        return locationService.getLocationData();
    }

}

해결 방법 : @ResponseBody를 넣어준다