[Troubleshooting] SpringBoot Warning Could not find acceptable representation

surroundings

Java 1.8

SpringBoot 2.1.9

Java interface code

    @ResponseBody
    @RequestMapping(value = "cloud", method = RequestMethod.GET,produces = "applications/json;charset=UTF-8")
    public Boolean queryItemInfoAllInCloud(){
        ItemInfo itemInfo = itemService.queryItemInfoAllInCloud();
        if(itemInfo == null) return false;
        return true;
    }

Request path

http://127.0.0.1:8080/controller/cloud/

Warnings

2019-11-14 14:56:57.465  WARN 57604 Resolved [org.springframework.web.HttpMediaTypeNotAcceptableException: Could not find acceptable representation]

This sentence translates to "Can not find an acceptable representation" can be understood as the browser can not find the right type of request to display the return value interface?

Then the problem is in 

produces = "applications/json;charset=UTF-8"

This code means that the type of return json response data, but we return a Boolean value of the interface is, of course, can not be returned

So to change this code

produces=MediaType.APPLICATION_JSON_VALUE

A satisfactory solution to the problem