当前位置：网站首页>Regarding the missing json converter, the error message is: No converter found for return value of type

Regarding the missing json converter, the error message is: No converter found for return value of type

2022-08-10 10:24:00 【51CTO】

报错内容如下：

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

no nonsense, The reasons for this problem may include the following two：

①springMVC的配置文件

dispatcherServlet-servlet.xml

里面没有对jsonConfiguration information for the converter.

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.
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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： Install the above mentionedjar包,下载导入即可. mavenItems are copied and pasted directlypom.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://yzsam.com/2022/222/202208101005055331.html

当前位置：网站首页>Regarding the missing json converter, the error message is: No converter found for return value of type

Regarding the missing json converter, the error message is: No converter found for return value of type

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