3.1.2 -> 3.2 issue with ContentNegotiatingViewResolver.

[sbirnie]

I'm getting a ClassCastException after I update from Spring 3.1.2 to 3.2. This works with 3.1.2. It's possible I missed something in the release notes? Any thoughts?

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.web.servlet.view.ContentNegotiatingViewResolver#0' defined in ServletContext resource [/WEB-INF/spring/appServlet/servlet-context.xml]: Invocation of init method failed; nested exception is java.lang.ClassCastException: java.lang.String cannot be cast to org.springframework.http.MediaType
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1486)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:607)
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
	at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598)
	at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661)
	at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517)
	at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458)
	at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138)
	at javax.servlet.GenericServlet.init(GenericServlet.java:212)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1206)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
	at org.apache.catalina.core.StandardService.start(StandardService.java:525)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:601)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to org.springframework.http.MediaType
	at org.springframework.web.accept.MappingMediaTypeFileExtensionResolver.<init>(MappingMediaTypeFileExtensionResolver.java:56)
	at org.springframework.web.accept.AbstractMappingContentNegotiationStrategy.<init>(AbstractMappingContentNegotiationStrategy.java:42)
	at org.springframework.web.accept.PathExtensionContentNegotiationStrategy.<init>(PathExtensionContentNegotiationStrategy.java:74)
	at org.springframework.web.accept.ServletPathExtensionContentNegotiationStrategy.<init>(ServletPathExtensionContentNegotiationStrategy.java:47)
	at org.springframework.web.accept.ContentNegotiationManagerFactoryBean.afterPropertiesSet(ContentNegotiationManagerFactoryBean.java:166)
	at org.springframework.web.servlet.view.ContentNegotiatingViewResolver.afterPropertiesSet(ContentNegotiatingViewResolver.java:270)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1545)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1483)
	... 33 more

<beans:bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
	<beans:property name="mediaTypes">
		<beans:map>
			<beans:entry key="html" value="text/html" />
			<beans:entry key="json" value="application/json" />
		</beans:map>
	</beans:property>
	<beans:property name="viewResolvers">
		<beans:list>
			<beans:bean class="org.springframework.web.servlet.view.tiles2.TilesViewResolver" />
			<beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
				<beans:property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
				<beans:property name="prefix" value="/WEB-INF/views/" />
				<beans:property name="suffix" value=".jsp" />
			</beans:bean>
		</beans:list>
	</beans:property>
	<beans:property name="defaultViews">
		<beans:list>
			<beans:bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />
		</beans:list>
	</beans:property>
</beans:bean>

[luolunci]

Hi sbirnie,

I'm also having the same problem. I upgraded to 3.2 to get access to packagesToScan in JAXB2Marshaller, but then had the same error as you.

I was digging a bit, but not much resource on that. All I know for now is that the method has been deprecated, and that we have to use setContentNegotiationManager(ContentNegotiationMan ager) instead. Seems the responsibility of finding the correct mediaType has move to there, but no example on how to build it, I'll try to look by myself...

Found that in the javadoc for the new ContentNegotiatingViewResolver:
http://static.springsource.org/sprin...wResolver.html

Hope it helps! I will post an example if I can find it!

Regards,

Laurent.

[ranob]

I have the same problem...anybody has resolved?

Thx!
Ranob

Hi sbirnie,

I'm also having the same problem. I upgraded to 3.2 to get access to packagesToScan in JAXB2Marshaller, but then had the same error as you.

I was digging a bit, but not much resource on that. All I know for now is that the method has been deprecated, and that we have to use setContentNegotiationManager(ContentNegotiationMan ager) instead. Seems the responsibility of finding the correct mediaType has move to there, but no example on how to build it, I'll try to look by myself...

Found that in the javadoc for the new ContentNegotiatingViewResolver:
http://static.springsource.org/sprin...wResolver.html

Hope it helps! I will post an example if I can find it!

Regards,

Laurent.

[luolunci]

Hi guys,

this seems to work for me:

    <!-- REST -->
    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="order" value="1" />
        <property name="contentNegotiationManager">
            <bean class="org.springframework.web.accept.ContentNegotiationManager">
                <constructor-arg>
                    <bean class="org.springframework.web.accept.PathExtensionContentNegotiationStrategy">
                        <constructor-arg>
                            <map>
                                <entry key="json" value="application/json"/>
                                <entry key="xml" value="application/xml"/>
                            </map>
                        </constructor-arg>
                    </bean>
                </constructor-arg>
            </bean>
        </property>


        <property name="defaultViews">
            <list>
                <!-- JSON View -->
                <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />

                <!-- XML View -->
                <bean class="org.springframework.web.servlet.view.xml.MarshallingView">
                    <constructor-arg>
                        <bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
                            <property name="packagesToScan">
                                <list>
                                    <value>documentLoader.domain</value>
                                </list>
                            </property>
                        </bean>
                    </constructor-arg>
                </bean>
            </list>
        </property>
    </bean>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

Regards,

Laurent.

[ranob]

Thx Laurent!!

Hi guys,

this seems to work for me:

    <!-- REST -->
    <bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
        <property name="order" value="1" />
        <property name="contentNegotiationManager">
            <bean class="org.springframework.web.accept.ContentNegotiationManager">
                <constructor-arg>
                    <bean class="org.springframework.web.accept.PathExtensionContentNegotiationStrategy">
                        <constructor-arg>
                            <map>
                                <entry key="json" value="application/json"/>
                                <entry key="xml" value="application/xml"/>
                            </map>
                        </constructor-arg>
                    </bean>
                </constructor-arg>
            </bean>
        </property>


        <property name="defaultViews">
            <list>
                <!-- JSON View -->
                <bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView" />

                <!-- XML View -->
                <bean class="org.springframework.web.servlet.view.xml.MarshallingView">
                    <constructor-arg>
                        <bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
                            <property name="packagesToScan">
                                <list>
                                    <value>documentLoader.domain</value>
                                </list>
                            </property>
                        </bean>
                    </constructor-arg>
                </bean>
            </list>
        </property>
    </bean>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

Regards,

Laurent.

[ias]

In addition, spring-oxm dependency is required to make Laurent's solution work.

Thanks!

Thx Laurent!!