我有一个dispatcher-servlet.xml 文件，其中包含Bean像这样：
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver" p:defaultContentType="text/html">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html"/>
<entry key="json" value="application/json"/>
</map>
</property>
<property name="viewResolvers">
<list>
<bean id="localBasedViewResolver" class="com.company.web.i18n.LocaleBasedViewResolver"
p:viewClass="org.springframework.web.servlet.view.JstlView"
p:prefix="${views.prefix}"
p:suffix="${views.suffix}"
p:cacheUnresolved="false"
p:exposedContextBeanNames="webProperties"
p:order="1"
/>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:viewClass="org.springframework.web.servlet.view.JstlView"
p:prefix="${views.prefix}"
p:suffix="${views.suffix}"
p:cacheUnresolved="false"
p:exposedContextBeanNames="webProperties"
p:order="2"
/>
</list>
</property>
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>
</list>
</property>
</bean>
升级到 Spring 4.2 后出现以下错误：
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'mediaTypes' of bean class [org.springframework.web.servlet.view.ContentNegotiatingViewResolver]: Bean property 'mediaTypes' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:230) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:423) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:280) ~[spring-beans-4.2.6.RELEASE.jar:4.2.6.RELEASE]
这在升级之前就有效，因此任何有关如何修复的帮助将不胜感激！
Spring 4.2 ContentNegotiatingViewResolver 现在将内容协商委托给 ContentNegotiationManager。在应用程序上下文中定义 ContentNegotiationManager bean 并将其设置在视图解析器上，如下所示
<bean id="contentNegotiationManager" class="org.springframework.web.accept.ContentNegotiationManagerFactoryBean">
<property name="favorPathExtension" value="true" />
<property name="ignoreAcceptHeader" value="true"/>
<property name="useJaf" value="false"/>
<property name="defaultContentType" value="text/html" />
<property name="mediaTypes">
<map>
<entry key="html" value="text/html"/>
<entry key="json" value="application/json"/>
</map>
</property>
</bean>
然后更新您的视图解析器，如下所示
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="contentNegotiationManager" ref="contentNegotiationManager"/>
<property name="viewResolvers">
<list>
<bean id="localBasedViewResolver" class="com.company.web.i18n.LocaleBasedViewResolver"
p:viewClass="org.springframework.web.servlet.view.JstlView"
p:prefix="${views.prefix}"
p:suffix="${views.suffix}"
p:cacheUnresolved="false"
p:exposedContextBeanNames="webProperties"
p:order="1"
/>
<bean id="viewResolver"
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:viewClass="org.springframework.web.servlet.view.JstlView"
p:prefix="${views.prefix}"
p:suffix="${views.suffix}"
p:cacheUnresolved="false"
p:exposedContextBeanNames="webProperties"
p:order="2"
/>
</list>
</property>
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJackson2JsonView"/>
</list>
</property>
</bean>
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