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I would like to have a bidirectional JSON to Java serialization I'm using successfully the Java to JSON to JQuery path... ( @ResponseBody ) e.g. @RequestMapping(value={"/fooBar/{id}"}, method=RequestMethod.GET) public @ResponseBody FooBar getFooBar( @PathVariable String id, HttpServletResponse response , ModelMap model) { response.setContentType("application/json"); ... } and In JQuery I use $.getJSON('fooBar/1', function(data) { //do something }); this works well (e.g. annotations work already, thanks to all the answerers) However, how do I do the reverse path: have JSON be serialized to a Java Object back using RequestBody? no matter what I try, I can't get something like this to work: @RequestMapping(value={"/fooBar/save"}, method=RequestMethod.POST) public String saveFooBar(@RequestBody FooBar fooBar, HttpServletResponse response , ModelMap model) { //This method is never called. (it does when I remove the RequestBody...) } I have Jackson configured correctly (it serializes on the way out) and I have MVC set as annotations driven of course How do I make it work? is it possible at all? or is Spring / JSON / JQuery is oneway (out)? Update: I changed this Jackson setting <bean id="jsonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />  <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <util:list id="beanList"> <ref bean="jsonHttpMessageConverter" /> <!-- <ref bean="xmlMessa

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