Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct..........

double_lifly

已于 2023-02-06 18:40:21 修改

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文章标签： java Exception Jackson 序列化问题微服务

于 2023-02-06 18:35:45 首次发布

本文链接：https://blog.youkuaiyun.com/qq_41934990/article/details/128906223

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文章描述了在后端部署代码后，前端在对接接口时遇到的一个Jackson序列化问题。错误日志显示因缺少无参构造函数导致无法反序列化`com.chilwee.dtos.socket.down.FivePower`实例。解决方案是在实体类中添加`@NoArgsConstructor`注解或显式定义无参构造函数，重启服务后问题得到解决。

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将后端代码部署到服务器上,供前端人员接接口,前端在接接口遇到的问题,登录服务器看了下日志,发现是jackson序列化问题,日志如下:

2023-02-06 10:49:13,167 [cp-charge-admin,,,] [http-nio-0.0.0.0-2015-exec-7] ERROR c.chilwee.aspect.ControllerExceptionHandlerAdvice - [/admin/chargerCommand/setFivePower] [null]
org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class com.chilwee.dtos.socket.down.FivePower]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.chilwee.dtos.socket.down.FivePower` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 2, column: 3]
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:272)
        at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.read(AbstractJackson2HttpMessageConverter.java:257)
        at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:205)
        at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.readWithMessageConverters(RequestResponseBodyMethodProcessor.java:158)
        at org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.resolveArgument(RequestResponseBodyMethodProcessor.java:131)
        at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:121)
        at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:167)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:134)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod