<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>
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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。
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https://blog.51cto.com/u_13519022/5562090
