使用HuTool工具包发送json参数的post请求报错org.springframework.http.converter.HttpMessageNotReadableException

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已于 2024-12-09 12:37:15 修改

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文章标签： json http 网络协议

于 2024-12-01 15:06:30 首次发布

本文链接：https://blog.youkuaiyun.com/weixin_45957747/article/details/144169955

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在用HuTool的HttpRequest发送实体类的json字符串时报错：

Resolved [org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of `com.lulu.sdk.model.User` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.lulu.sdk.model.User` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)<EOL> at [Source: (org.springframework.util.StreamUtils$NonClosingInputStream); line: 1, column: 2]]

这个异常是springmvc的处理器无法将json串转成@RequestBody标注的实体类，

原因是我定义的这个实体类没有无参构造，Jackson（一个流行的Java JSON库）无法从提供的JSON数据中创建实体类的实例

同时实体类属性要保证有set方法