ContentNegotiatingViewResolver MediaTypes Error after Upgrading to Spring 4.2

问题:

I have a dispatcher-servlet.xml file that has a Bean like this:

<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> 

After upgrading to Spring 4.2 I get the following error:

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] 

This worked before the upgrade, so any help on how to fix would be greatly appreciated!

回答1:

Spring 4.2 ContentNegotiatingViewResolver now delegates content negotiation to a ContentNegotiationManager. Define a ContentNegotiationManager bean in your application context and set it on your view resolver as follows

 <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> 

Then update your view resolver as follows

<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> 

文章来源: ContentNegotiatingViewResolver MediaTypes Error after Upgrading to Spring 4.2