Cannot construct instance of `com.jty.entities.Dept` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

使用RestTemplate對象訪問請求出錯

@GetMapping(value = "/consumer/dept/get/{id}")
    public Dept get(@PathVariable Long id){
        return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id,Dept.class);
    }

Cannot construct instance of com.jty.entities.Dept (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)

原因是缺少構造函數、或者定義了有參構造函數、沒定義無參構造函數