UnrecognizedPropertyException: Unrecognized field “@type“ not marked as ignorable

• 问题背景：Redis里的数据取出来反序列成对象，报错 com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "@type" (class com.xx.common.xx.xxx.xxx.LoginUser)
  

• 有可能的原因

• 1、@type类型与本地对象类型不同，比如：字符串 @type是com.xx.common.xx.xxx.xxx.LoginUser，但你本地对象是com.yy.common.xx.xxx.xxx.LoginUser。

• 2、数据字段和本地对象对应相差太大。

• 解决方案，代码如下所示

        String str = "{\"os\":\"Windows 10 or Windows Server 2016\",\"@type\":\"com.xx.common.xx.xx.xx.LoginUser\",..........}";
        ObjectMapper objectMapper = new ObjectMapper();
         //这句代码
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        LoginUser loginUser = objectMapper.readValue(str, LoginUser.class);
        System.out.println(loginUser);