no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature

SpringCloud Feign API调用错误：User实体类缺失set/get方法的解决方案

原创已于 2022-10-24 16:42:38 修改 · 1.6k 阅读

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#spring cloud #1024程序员节

于 2022-10-24 14:46:15 首次发布

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本文讲述了在SpringCloud项目中Feign调用时报错，原因在于User实体类缺少set和get方法。解决办法是在User类上添加必要的getter和setter，以确保序列化兼容。错误信息提示了Jackson库找不到User的序列化器。

springcloud项目中，feign-api调用报错：

Whitelabel Error Page

This application has no explicit mapping for /error, so you are seeing this as a fallback.

Mon Oct 24 14:33:26 CST 2022

There was an unexpected error (type=Internal Server Error, status=500).

Type definition error: [simple type, class cn.it32.feign.pojo.User]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class cn.it32.feign.pojo.User and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: cn.it32.order.pojo.Order["user"])

![在这里插入图片描述](https://img-blog.csdnimg.cn/bcd6ea04c41f4e9c84b5097623aea94a.png) 同时，日志中也报错： Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class cn.it32.feign.pojo.User]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: No serializer found for class cn.it32.feign.pojo.User and no properties discovered to create BeanSerializer (to avoid exception, disable SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain: cn.it32.order.pojo.Order["user"])] with root caus

原因分析：实体类user未创建set、get方法。

解决办法：为实体类user创建set、get方法。