日常Exception第二十八回：com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitio

Posted 2022-12-08 善良勤劳勇敢而又聪明的老杨

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1、问题

报错信息：com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "tcount": xxx.xxx.xxx.xxx.GroupStateRequestBean#setTcount(1 params) vs xxx.xxx.xxx.xxx.GroupStateRequestBean#setTcount(1 params)

2021-07-13 09:28:54,615 [http-nio-8302-exec-1] WARN (CompositeLog.java:127)- Failed to evaluate Jackson deserialization for type [[simple type, class xxx.xxx.xxx.xxx.xxx.GroupStateRequestBean]]: com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "tcount": xxx.xxx.xxx.xxx.xxx.GroupStateRequestBean#setTcount(1 params) vs xxx.xxx.xxx.xxx.xxx.GroupStateRequestBean#setTcount(1 params)
2021-07-13 09:28:54,616 [http-nio-8302-exec-1] WARN (CompositeLog.java:127)- Failed to evaluate Jackson deserialization for type [[simple type, class xxx.xxx.xxx.xxx.xxx.GroupStateRequestBean]]: com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "tcount": xxx.xxx.xxx.xxx.xxx.GroupStateRequestBean#setTcount(1 params) vs xxx.xxx.xxx.xxx.xxx.GroupStateRequestBean#setTcount(1 params)
2021-07-13 09:28:54,624 [http-nio-8302-exec-1] ERROR (GlobalExceptionHandler.java:143)- exception:
org.springframework.web.HttpMediaTypeNotSupportedException: Content type 'application/json;charset=UTF-8' not supported
at org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodArgumentResolver.readWithMessageConverters(AbstractMessageConverterMethodArgumentResolver.java:225)
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.java:106)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:879)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)

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2、问题分析

先看一下报错类的信息截图：

报错原因：如果bean 中有定义两个 同名方法，如果jackson反序列化过程中，不能正常识别，就会出现上述异常。

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 3、解决方法

        在其中一个方法上加上注解@JsonIgnore，不参于序列化，即可解决！

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