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I'm familiar with how to return json from my @Controller methods using the @ResponseBody annotation. Now I'm trying to read some json arguments into my controller, but haven't had luck so far. Here's my controller's signature: @RequestMapping(value = "/ajax/search/sync") public ModelAndView sync(@RequestParam("json") @RequestBody SearchRequest json) { But when I try to invoke this method, spring complains that: Failed to convert value of type 'java.lang.String' to required type 'com.foo.SearchRequest' Removing the @RequestBody annotation doesn't seem to make a difference. Manually parsing the json works, so Jackson must be in the classpath: // This works @RequestMapping(value = "/ajax/search/sync") public ModelAndView sync(@RequestParam("json") String json) { SearchRequest request; try { request = objectMapper.readValue(json, SearchRequest.class); } catch (IOException e) { throw new IllegalArgumentException("Couldn't parse json into a search request", e); } Any ideas? Am I trying to do something that's not supported?

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