Spring 3.0 making JSON response using jackson message converter

i configure my messageconverter as Jackson's then

class Foo{int x; int y}

and in controller

@ResponseBody
public Foo method(){
   return new Foo(3,4)
}

from that im expecting to return a JSON string {x:'3',y:'4'} from server without any other configuration. but getting 404 error response to my ajax request

If the method is annotated with @ResponseBody, the return type is written to the response HTTP body. The return value will be converted to the declared method argument type using HttpMessageConverters.

Am I wrong ? or should I convert my response Object to Json string myself using serializer and then returning that string as response.(I could make string responses correctly) or should I make some other configurations ? like adding annotations for class Foo

here is my conf.xml

<bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">

  <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
  <list>
    <ref bean="jacksonMessageConverter"/>
  </list>
</property>

You need the following:

@RequestMapping(method = { RequestMethod.GET, RequestMethod.POST })
public @ResponseBody Foo method(@Valid Request request, BindingResult result){
return new Foo(3,4)
}

This works for me.

Please note, that

This worked for me:

@RequestMapping(value = "{p_LocationId}.json", method = RequestMethod.GET)
protected void getLocationAsJson(@PathVariable("p_LocationId") Integer p_LocationId,
     @RequestParam("cid") Integer p_CustomerId, HttpServletResponse response) {
        MappingJacksonHttpMessageConverter jsonConverter = 
                new MappingJacksonHttpMessageConverter();
        Location requestedLocation = new Location(p_LocationId);
        MediaType jsonMimeType = MediaType.APPLICATION_JSON;
        if (jsonConverter.canWrite(requestedLocation.getClass(), jsonMimeType)) {
        try {
            jsonConverter.write(requestedLocation, jsonMimeType,
                                   new ServletServerHttpResponse(response));
            } catch (IOException m_Ioe) {
                // TODO: announce this exception somehow
            } catch (HttpMessageNotWritableException p_Nwe) {
                // TODO: announce this exception somehow
            }
        }
}

Note that the method doesn't return anything: MappingJacksonHttpMessageConverter#write() does the magic.

The MessageConverter interface http://static.springsource.org/spring/docs/3.0.x/javadoc-api/ defines a getSupportedMediaTypes() method, which in case of the MappingJacksonMessageCoverter returns application/json

public MappingJacksonHttpMessageConverter() {
    super(new MediaType("application", "json", DEFAULT_CHARSET));
}

I assume a Accept: application/json request header is missing.

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