Q:

How To Change Default Media Type for Spring MVC From XML to JSON

Title pretty much says it all. Right now it's using XML as the default in the responses from my controller but I want it to use JSON as the default when no Accepts header or format parameter is specified. 
My mvc-config.xml
<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
    <property name="mediaTypes">

        <map>
            <entry key="html" value="text/html" />
            <entry key="json" value="application/json" />
            <entry key="xml" value="application/xml" />
        </map>
    </property>
    <property name="defaultViews">
        <list>
            <bean class="com.work.web.view.json.ExtendedMappingJacksonJsonView">
                <property name="objectMapper">
                    <ref bean="JacksonObjectMapper" />
                </property>
            </bean>
            <bean class="org.springframework.web.servlet.view.xml.MarshallingView">
                <property name="marshaller">
                    <ref bean="Jaxb2Marshaller" />
                </property>
            </bean>
        </list>
    </property>
    <property name="favorParameter" value="true" />
</bean>

<bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
        <list>
            <bean
                class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
                <property name="objectMapper">
                    <ref bean="JacksonObjectMapper" />
                </property>
            </bean>
            <ref bean="marshallingHttpMessageConverter" />
        </list>
    </property>
</bean>

<bean id="marshallingHttpMessageConverter"
    class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
    <property name="marshaller" ref="Jaxb2Marshaller" />
    <property name="unmarshaller" ref="Jaxb2Marshaller" />
</bean>
<bean id="JacksonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper" />
<bean id="JacksonSerializationConfig" class="org.codehaus.jackson.map.SerializationConfig"
    factory-bean="JacksonObjectMapper" factory-method="getSerializationConfig" />
<bean
    class="org.springframework.beans.factory.config.MethodInvokingFactoryBean">
    <property name="targetObject" ref="JacksonSerializationConfig" />
    <property name="targetMethod" value="setSerializationInclusion" />
    <property name="arguments">
        <list>
            <value type="org.codehaus.jackson.map.annotate.JsonSerialize.Inclusion">NON_NULL</value>
        </list>
    </property>
</bean>
<bean id="Jaxb2Marshaller" class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
    <property name="classesToBeBound">
        <list>
            <value>com.work.Concepts</value>

        </list>
    </property>
</bean>

A:

<property name="defaultContentType" value="application/json" />

when setting up ContentNegotiatingViewResolver bean

