Spring MVC Test with RestTemplate: Generic collection fails (even with ParameterizedTypeReference) -

i working spring framework 4.3.1

i have following domain class

@xmlrootelement(name="persona") @xmltype(proporder = {"id","nombre","apellido","fecha"}) public class persona implements serializable {      @xmlelement(name="id")     @jsonproperty("id")     public string getid() {         return id;     }      .... 

where each getter has @xmlelement , @jsonproperty annotations. working jaxb2 , jackson2

i have following too:

@xmlrootelement(name="collection") public class genericcollection<t> {      private collection<t> collection;      public genericcollection(){      }      public genericcollection(collection<t> collection){         this.collection = collection;     }      @xmlelement(name="item")     @jsonproperty("collection")     public collection<t> getcollection() {         return collection;     }      public void setcollection(collection<t> collection) {         this.collection = collection;     }      @override     public string tostring() {       stringbuilder builder = new stringbuilder();       for(object object : collection){         builder.append("[");         builder.append(object.tostring());         builder.append("]");       }       return builder.tostring();     }  } 

about testing, many @tests methods working through spring mvc test work fine. @controller , @restcontroller work how expected.

note: can test crud scenarios, http methods such post, put, get , delete. therefore able 1 entity , collection of entities.

note: previous note, works working around xml , json formats.

now trying testing through resttemplate how kind of programmatic client, only fails collections. following:

@before public void setup(){     mockmvc = mockmvcbuilders.webappcontextsetup(webapplicationcontext).build();     resttemplate = new resttemplate(new mockmvcclienthttprequestfactory(mockmvc));      list<httpmessageconverter<?>> converters = new arraylist<>();     converters.add(httpmessageconverterconfig.marshallingmessageconverter());     converters.add(httpmessageconverterconfig.mappingjackson2httpmessageconverter());      resttemplate.setmessageconverters(converters);     system.out.println("converters.size():" + converters.size()); } 

i can confirm converters.size() prints 2

the following xml , json

@test public void findallxmltest(){      requestentity<void> requestentity = restcontrollersupport_.createrequestentityforget(uri, retrieveuri);      parameterizedtypereference<genericcollection<persona>> parameterizedtypereference = new parameterizedtypereference<genericcollection<persona>>(){};     responseentity<genericcollection<persona>> responseentity = resttemplate.exchange(requestentity, parameterizedtypereference);      assertthat(responseentity, notnullvalue());      assertthat(responseentity.getstatuscode(), is(httpstatus.ok));     assertthat(responseentity.getheaders().getcontenttype(), is(mediatype.application_xml) );      assertthat(responseentity.getbody(), notnullvalue());     assertthat(responseentity.getbody().getclass(), is(genericcollection.class));     assertthat(responseentity.getbody().getcollection(), is(personas));  }  @test public void findalljsontest(){      requestentity<void> requestentity = restcontrollersupport_.createrequestentityforget(uri, retrieveuri);      parameterizedtypereference<genericcollection<persona>> parameterizedtypereference = new parameterizedtypereference<genericcollection<persona>>(){};     responseentity<genericcollection<persona>> responseentity = resttemplate.exchange(requestentity, parameterizedtypereference);      assertthat(responseentity, notnullvalue());      assertthat(responseentity.getstatuscode(), is(httpstatus.ok));     assertthat(responseentity.getheaders().getcontenttype(), is(mediatype.application_json_utf8) );      assertthat(responseentity.getbody(), notnullvalue());     assertthat(responseentity.getbody().getclass(), is(genericcollection.class));     assertthat(responseentity.getbody().getcollection(), is(personas));  } 

note: observe using parameterizedtypereference both scenarios.

for json works.

but xml get:

org.springframework.web.client.restclientexception: not extract response: no suitable httpmessageconverter found response type [com.manuel.jordan.controller.support.genericcollection<com.manuel.jordan.domain.persona>] , content type [application/xml]     @ org.springframework.web.client.httpmessageconverterextractor.extractdata(httpmessageconverterextractor.java:109) 

what wrong or missing?

your problem use marshallinghttpmessageconverter isn't generichttpmessageconverter, expected parameterizedtypereference in httpmessageconverterextractor:

if (messageconverter instanceof generichttpmessageconverter) {                 generichttpmessageconverter<?> genericmessageconverter =                         (generichttpmessageconverter<?>) messageconverter;                 if (genericmessageconverter.canread(this.responsetype, null, contenttype)) { 

the mappingjackson2httpmessageconverter one.

so, suggest try jaxb2collectionhttpmessageconverter.