Spring configuration - mvc:annotation-driven, AnnotationMethodHandlerAdapter, and JSON - json

Question

Thanks in advance any help.
I'm trying to get one of my controller methods to return JSON. Starting off with a simple test:
#RequestMapping(value="/myReqPath", method=RequestMethod.GET)
#ResponseBody
public Map<String, String> myJsonMethod() {
Map<String, String> response = new TreeMap<String, String>();
response.put("test", "test");
return response;
}
It's my understanding that I need <mvc:annotation-driven/> added to my servlet context to accomplish this. The problem is when I add it, it breaks my custom AnnotationMethodHandlerAdapter.
[B]How do I extract and add the needed parts of <mvc:annotation-driven/> to return JSON from the controller?[/B]
Here are the pertinent parts of my servlet config:
<!--Skipping this for now...
<mvc:annotation-driven/>
-->
<!-- JSON Marshaling -->
<util:constant id="jsonBasicClassIntrospector"
static-field="org.codehaus.jackson.map.introspect.BasicClassIntrospector.instance" />
<bean id="jsonJaxbAnnotationIntrospector"
class="org.codehaus.jackson.xc.JaxbAnnotationIntrospector" />
<bean id="jsonVisibilityChecker"
class="org.codehaus.jackson.map.introspect.VisibilityChecker.Std"
factory-method="defaultInstance" />
<bean id="jsonDefaultTypeFactory"
class="org.codehaus.jackson.map.type.TypeFactory"
factory-method="defaultInstance" />
<bean id="jsonObjectMapper" class="org.codehaus.jackson.map.ObjectMapper">
<property name="serializationConfig">
<bean class="org.codehaus.jackson.map.SerializationConfig">
<constructor-arg ref="jsonBasicClassIntrospector" />
<constructor-arg ref="jsonJaxbAnnotationIntrospector" />
<constructor-arg ref="jsonVisibilityChecker" />
<constructor-arg><null/></constructor-arg>
<constructor-arg><null/></constructor-arg>
<constructor-arg ref="jsonDefaultTypeFactory" />
<constructor-arg><null/></constructor-arg>
</bean>
</property>
<property name="deserializationConfig">
<bean class="org.codehaus.jackson.map.DeserializationConfig">
<constructor-arg ref="jsonBasicClassIntrospector" />
<constructor-arg ref="jsonJaxbAnnotationIntrospector" />
<constructor-arg ref="jsonVisibilityChecker" />
<constructor-arg><null/></constructor-arg>
<constructor-arg><null/></constructor-arg>
<constructor-arg ref="jsonDefaultTypeFactory" />
<constructor-arg><null/></constructor-arg>
</bean>
</property>
</bean>
...
<!-- My custom AnnotationMethodHandlerAdapter... -->
<bean id="sessionArgResolver" class="com.SessionParamArgumentResolver"/>
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="customArgumentResolver" ref="sessionArgResolver"/>
</bean>
As it stands, my controller method is invoked however, the browser returns http status 406:
406 Not Acceptable - [url]http://localhost:8080/myApp/myReqPath[/url]

Answer 1

If you already have a custom AnnotationMethodHandlerAdapter declaration, you can just add a list of HttpMessageConverters to it:
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="customArgumentResolver" ref="sessionArgResolver"/>
<property name = "messageConverters">
<list>
<bean
class = "org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
<property name = "objectMapper" ref = "jsonObjectMapper" />
</bean>
</list>
</property>
</bean>