I am running a Spring 3.1.2 application. I have a RESTful servlet with a number of methods. The GET methods are working fantastic (@PathVariables matching, responses correctly marshalled to JSON or XML based on the Accept header, etc) 100% of the time.

However the POST method is simply not working. After hours of messing around with converts and every other Spring aspect I could find (all tinkering reverted), I narrowed it do to the required field in @RequestParam. This is a simplified test method I've been using to investigate:

@RequestMapping (value = "/bogus",
                 method = POST)
public @ResponseBody PassResponse bogus (
            @RequestParam (value = "test", required = false) String test) {
    // Just some handy garbage objects that marshal to JSON/XML
    UserResponse user = new UserResponse ();
    user.setName (test);
    AccountDetail detail = new AccountDetail (user,null);
    return new PassResponse (detail);
}

required=false: everything works (parameter is received and interpreted). Exactly as I expect it to work

required=true: (or not specified, since this is the default) I consistently get the message "MissingServletRequestParameterException: Required String parameter 'test' is not present"

Client side view:

required=true

Request URL:http://localhost:8080/internal-project/rest/bogus
Request Method:POST
Status Code:400 Bad Request
Request Headersview source
Accept:application/json
Connection:keep-alive
Content-Length:12
Host:localhost:8080
Request Payload
test=LALALAA
Response Headersview source
Connection:close
Content-Length:971
Content-Type:text/html;charset=utf-8
Date:Wed, 24 Oct 2012 18:41:05 GMT
Server:Apache-Coyote/1.1

required=false

Request URL:http://localhost:8080/internal-project/rest/bogus
Reque
spring rest
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