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关于json转换器缺失的问题，报错内容：No converter found for return value of type

2022-08-10 10:07:00 【51CTO】

<此博客只为自己学习记录，解决方案是综合了网上各种解决思路和方法，最后实践加以解决后，作为备忘录的用途。>

报错内容如下：

nested exception is java.lang.IllegalArgumentException: No converter found for return value of type: class java.XXX.XXX

直接不废话，出现这个问题的原因可能包含以下两个：

①springMVC的配置文件

dispatcherServlet-servlet.xml

里面没有对json转换器的配置信息。

②json的三个jar包导入

       
       <
       
       dependency
       
       >
       
       <
       
       groupId
       
       >
       
       com.
       
       fasterxml.
       
       jackson.
       
       core
       
       <
       
       /groupId>
       
       <
       
       artifactId
       
       >
       
       jackson
       
       -
       
       databind
       
       <
       
       /artifactId>
       
       <
       
       version
       
       >
       
       2.7
       
       .4
       
       <
       
       /version></
       
       dependency
       
       >
       
       <
       
       dependency
       
       >
       
       <
       
       groupId
       
       >
       
       com.
       
       fasterxml.
       
       jackson.
       
       core
       
       <
       
       /groupId>
       
       <
       
       artifactId
       
       >
       
       jackson
       
       -
       
       core
       
       <
       
       /artifactId>
       
       <
       
       version
       
       >
       
       2.7
       
       .4
       
       <
       
       /version></
       
       dependency
       
       >
       
       <
       
       dependency
       
       >
       
       <
       
       groupId
       
       >
       
       com.
       
       fasterxml.
       
       jackson.
       
       core
       
       <
       
       /groupId>
       
       <
       
       artifactId
       
       >
       
       jackson
       
       -
       
       annotations
       
       <
       
       /artifactId>
       
       <
       
       version
       
       >
       
       2.7
       
       .4
       
       <
       
       /version>
       
       <
       
       /dependency>
      
1.
2.
3.
4.
5.
6.
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8.
9.
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15.

①的解决方案，在dispatcherServlet-servlet.xml

       
       <
       
       bean 
       
       class
       
       =
       
       "org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"
       
       >
       
       <
       
       property 
       
       name
       
       =
       
       "messageConverters"
       
       >
       
       <
       
       list
       
       >
       
       <!--json转换器-->
       
       <
       
       ref 
       
       bean
       
       =
       
       "mappingJacksonHttpMessageConverter" 
       
       /
       
       >
       
       <
       
       /list>
       
       <
       
       /property>
       
       <
       
       /bean>
       
       <
       
       bean 
       
       class
       
       =
       
       "org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"
       
       >  
       
       <
       
       property 
       
       name
       
       =
       
       "messageConverters"
       
       >  
       
       <
       
       list
       
       >  
       
       <
       
       ref 
       
       bean
       
       =
       
       "mappingJacksonHttpMessageConverter" 
       
       /
       
       >  
       
       <
       
       /list> 
       
       <
       
       /property> 
       
       <
       
       /bean> 
       
       <
       
       bean 
       
       id
       
       =
       
       "mappingJacksonHttpMessageConverter"  
       
       class
       
       =
       
       "org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"
       
       >  
       
       <
       
       property 
       
       name 
       
       = 
       
       "supportedMediaTypes"
       
       >  
       
       <
       
       list
       
       >  
       
       <
       
       bean 
       
       class
       
       =
       
       "org.springframework.http.MediaType"
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "0" 
       
       value
       
       =
       
       "text"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "1" 
       
       value
       
       =
       
       "plain"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "2" 
       
       value
       
       =
       
       "UTF-8"
       
       /
       
       >  
       
       <
       
       /bean> 
       
       <
       
       bean 
       
       class
       
       =
       
       "org.springframework.http.MediaType"
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "0" 
       
       value
       
       =
       
       "*"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "1" 
       
       value
       
       =
       
       "*"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "2" 
       
       value
       
       =
       
       "UTF-8"
       
       /
       
       >  
       
       <
       
       /bean> 
       
       <
       
       bean 
       
       class
       
       =
       
       "org.springframework.http.MediaType"
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "0" 
       
       value
       
       =
       
       "text"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "1" 
       
       value
       
       =
       
       "*"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "2" 
       
       value
       
       =
       
       "UTF-8"
       
       /
       
       >  
       
       <
       
       /bean> 
       
       <
       
       bean 
       
       class
       
       =
       
       "org.springframework.http.MediaType"
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "0" 
       
       value
       
       =
       
       "application"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "1" 
       
       value
       
       =
       
       "json"
       
       /
       
       >  
       
       <
       
       constructor
       
       -
       
       arg 
       
       index
       
       =
       
       "2" 
       
       value
       
       =
       
       "UTF-8"
       
       /
       
       >  
       
       <
       
       /bean> 
       
       <
       
       /list> 
       
       <
       
       /property> </
       
       bean
       
       >
      
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②的解决方案：安装上面提到的jar包，下载导入即可。 maven项目就直接复制粘贴在pom.xml文件里面即可。

原网站

版权声明
本文为[51CTO]所创，转载请带上原文链接，感谢
https://blog.51cto.com/u_13519022/5562090

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