JSON parse error: No suitable constructor found for type

最新推荐文章于 2025-06-05 08:09:45 发布

转载最新推荐文章于 2025-06-05 08:09:45 发布 · 469 阅读

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原文链接：http://www.cnblogs.com/qishen/p/10400120.html

文章标签：

#json #java #测试

本文详细解析了在Spring框架中遇到的JSON解析错误，主要原因是实体类中有参构造但缺少无参构造，导致无法从JSON对象实例化。文章提供了错误信息及解决方案，并附有相关资源链接。

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错误信息：

2019-02-19 09:17:58,678 [http-nio-8080-exec-1] WARN org.springframework.web.servlet.mvc.support.DefaultHandlerExceptionResolver - Failed to read HTTP message: org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: No suitable constructor found for type [simple type, class com.findsoft.policy.api.param.web.caseexperiment.CreateOrUpdateCaseDepartmentStepRequest]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?); nested exception is com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.findsoft.policy.api.param.web.caseexperiment.CreateOrUpdateCaseDepartmentStepRequest]: can not instantiate from JSON object (missing default constructor or creator, or perhaps need to add/enable type information?) at [Source: java.io.PushbackInputStream@53fb391e; line: 2, column: 3]

报错原因：由于实体类写有参构造函数，但是未补充无参构造函数，引发报错。

Java构造函数详解可访问：https://blog.youkuaiyun.com/qq_33642117/article/details/51909346

转载于:https://www.cnblogs.com/qishen/p/10400120.html