Cannot construct instance ，non-static inner classes like this can only by instantiated using default

调用第三方接口返回的数据为:

{
    
    "depts":[{
    
    "mc":"B超室","bm":"20223"},{
    
    "mc":"儿科","bm":"004"}],"resultcode":0,"resulttext":"调用成功"}

实体类：

@Data
public class QueryResponse extends ResponseDTO {
    
    
    private List<Dept> depts;

    @Data
    public class Dept {
    
    
        public Dept(){
    
    }
        private String bm;
        private String mc;
    }
}

报错信息：

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `***$Dept`: non-static inner classes like this can only by instantiated using default, no-argument constructor

解决方式：将Dept单独新建一个实体类（我采用的），或者使用static修饰Dept内部类。