java - HttpMediaTypeNotAcceptableException when specifying applicaiton/xml in Accept header -

apologies, didn't see tag java-noob.

i working existing restful api in spring. tasked adding new api couple utility methods, each of return string. far good. working well.

i added simple wrapper return string object , i'm able build/deploy/test , response looks like

{ id: "12345" } 

if specify accept header = application/xml following exception:

org.springframework.web.httpmediatypenotacceptableexception: not find acceptable representation

other methods in package seem serialize in both xml , json fine. don't see custom serialization code being used in controller base , don't know handled (or if related serialization). can me figure out start looking?

here [simplified] controller:

@controller public class utilcontroller extends controllerbase {      @xmlrootelement(name="util_response")     public static class utilresponse extends apiresponsebase     {         private string id;          @xmlelement(name="id")         public string getid()         {             return id;         }          public void setid(string id)         {             this.id = id;         }     }      @requestmapping(value = "/{pid}/util/output", method = requestmethod.get)     @responsebody     public utilresponse output(httpservletresponse httpresponse,             @pathvariable("pid") int pid,             @requestparam(value = "id", required=true) string id) throws exception     {             utilresponse utilresponse = new utilresponse();             utilresponse.setid(id);             return utilresponse;     } } 

i tried updating @requestmapping , added produces = "application/xml" (yes, having no clue does), had 0 effect.

seriously, i'm new how java stuff "works" (.net dev trade) , love understand more. don't know jackson is, don't see references in our project , else seems work please no responses "why don't use jackson?" have deadlines getting working takes precedence.

please no responses "why don't use jackson?

nobody that. jackson json ;)

produces = "application/xml" ..., had 0 effect

produces restricts handler method provided types. produces="application\xml" makes method unavailable requests expect json, e.g. not change method's outcome.

your description of problem indicates spring not able finding way serialize utilresponse xml. cause jaxb2 not present on classpath. spring uses default create xml.