【FeignClient报错】Cannot deserialize value of type``from Object value (token `JsonToken.START

1. 问题描述

@FeignClient(name = "dataServiceQueryInterface", url = "${url}:${port}")
public interface DataServiceQueryInterface {@GetMapping("/dataReport/getSysAreaAllList")List<SysArea> getSysAreaAllList() throws Exception;
}

使用接口获取数据时报错：

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception
[Request processing failed; nested exception is feign.codec.DecodeException:
Error while extracting response for type
[java.util.List<com.xxx.datamatch.datacar.entity.SysArea>] and content type
[application/json;charset=UTF-8]; nested exception is
org.springframework.http.converter.HttpMessageNotReadableException:
JSON parse error: Cannot deserialize value of type
`java.util.ArrayList<com.xxx.datamatch.datacar.entity.SysArea>`
from Object value (token `JsonToken.START_OBJECT`);
nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException:
Cannot deserialize value of type
`java.util.ArrayList<com.xxx.datamatch.datacar.entity.SysArea>`
from Object value (token `JsonToken.START_OBJECT`)

2. 问题方法

试验 1 添加依赖【无任何效果】

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.46</version>
</dependency>

试验 2 修改返回类型【不报错但是结果数据是字符串未封装需要自行解析】

@FeignClient(name = "dataServiceQueryInterface", url = "${url}:${port}")
public interface DataServiceQueryInterface {@GetMapping("/dataReport/getSysAreaAllList")String getSysAreaAllList() throws Exception;
}

最终解决方案 3【将@GetMapping修改为@PostMapping】

@FeignClient(name = "dataServiceQueryInterface", url = "${url}:${port}")
public interface DataServiceQueryInterface {@PostMapping("/dataReport/getSysAreaAllList")List<SysArea> getSysAreaAllList() throws Exception;
}

原因没有进行深入探究，有知道原因的小伙伴可以分享一下~

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【FeignClient报错】Cannot deserialize value of type``from Object value (token `JsonToken.START_OBJECT`)

1. 问题描述

2. 问题方法

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