Indeed, I expected it to be picked up automatically. But well, at this moment, I'll try to not use this functionnality until I configure Spring correctly if needed.
Don't hesitate to let me know if you implement this feature. Thanks for all Sergey. 2009/4/29 Sergey Beryozkin <[email protected]>: > Hi, > > So how do you register this provider ? Do you do it from Spring ? > Perhaps you expect it be picked up automatically ? > We might add a support for picking up the providers through the > class-scanning - I honestly don't like this feature though but > I think we'll need to do it anyway as some users do expect it be picked up > from a classpath... > > thanks, Sergey > > > ----- Original Message ----- From: "Raphael F." <[email protected]> > To: <[email protected]> > Sent: Wednesday, April 29, 2009 4:59 PM > Subject: Re: Error : No message body writer found for response class : > ArrayList. - A String is OK... > > > Hello, > > Despite the update of CXF to 2.2.1, I still have the same error. I've > tried to change my MessageBodyWriter implementation as follows : > > --------------- > @Provider > @Produces("*/*") > public class StringListBodyWriter implements > MessageBodyWriter<ArrayList<String>> { > > public long getSize(ArrayList<String> t, Class<?> type, Type genericType, > Annotation[] annotations, MediaType mediaType) { > return -1; > } > > public boolean isWriteable(Class<?> type, Type genericType, > Annotation[] annotations, MediaType mediaType) { > return true; > } > > public void writeTo(ArrayList<String> t, Class<?> type, Type genericType, > Annotation[] annotations, MediaType mediaType, > MultivaluedMap<String, Object> httpHeaders, > OutputStream entityStream) throws IOException, > WebApplicationException { > BufferedWriter bw = new BufferedWriter(new OutputStreamWriter( > entityStream)); > String ts = null; > Iterator<String> i = t.iterator(); > while (i.hasNext()) { > ts += i.next().toString(); > } > bw.write(ts); > bw.flush(); > } > } > --------------- > > But the same error occurs. > > At client side, I try to get the response body as an array of byte > which I cast to a List of Strings, but for this moment, while error > occurs, I can't check this step. > > So, what could I do ? Does something goes wrong with the code above ? > Did I forgot a step, a class or another thing which I did not > precised, or did I mistake ? > > Thanks for help. > > Raphael. > > > 2009/4/28 Sergey Beryozkin <[email protected]>: >> >> Hi Raphael >> >> It should work fine - but I forgot top tell you that I only added >> genericEntity support very recently, as part of working on the TCK >> compliance, sorry about it. >> >> CXF 2.2.1 has just been released - it should have this fix. >> >> I believe the only reason GenericEntity is there is that it allows users >> to >> write providers for parameterized types. It has the information about the >> raw type and the generic type, and the runtime uses this information to >> find >> a matching provider. >> >> By the way, in getSize() you just need to return -1, unless you actually >> know the (Content-Length) value. It's a hint to the runtime on how to set >> a >> Content-Length HTTP response header, if it's -1 then it will be up to the >> underlying HTTP container on how to set it >> >> in isWriteable() there's no need to check for media types, as you already >> set them in Produces(), but you might want to check that the genericType >> is >> String.class... >> >> cheers, Sergey >> >> >> ----- Original Message ----- From: "Raphael F." <[email protected]> >> To: <[email protected]> >> Sent: Tuesday, April 28, 2009 5:05 PM >> Subject: Re: Error : No message body writer found for response class : >> ArrayList. - A String is OK... >> >> >> Hi Serguey, >> >> Thanks for your help. I'm just back from short holidays. >> >> So I've created a class implementing MessageBodyWriter interface for >> it can accept List<String> entity, as shown below : >> >> ----------------------------------------------------------- >> @Provider >> @Produces("text/xml,text/plain") >> public class StringListBodyWriter implements >> MessageBodyWriter<List<String>> { >> >> public long getSize(List<String> t, Class<?> type, Type genericType, >> Annotation[] annotations, MediaType mediaType) { >> Iterator<String> i = t.iterator(); >> long size = 0; >> while (i.hasNext()) { >> size += i.next().length(); >> System.out.println("La taille de " + i + " est : " >> + i.next().length()); >> } >> return size; >> } >> >> public boolean isWriteable(Class<?> type, Type genericType, >> Annotation[] annotations, MediaType mediaType) { >> return type.equals(List.class) >> && (mediaType.equals(MediaType.TEXT_PLAIN_TYPE) | mediaType >> .equals(MediaType.TEXT_XML_TYPE)); >> } >> >> public void writeTo(List<String> t, Class<?> type, Type genericType, >> Annotation[] annotations, MediaType mediaType, >> MultivaluedMap<String, Object> httpHeaders, >> OutputStream entityStream) throws IOException, >> WebApplicationException { >> BufferedWriter bw = new BufferedWriter(new OutputStreamWriter( >> entityStream)); >> String ts = null; >> Iterator<String> i = t.iterator(); >> while (i.hasNext()) { >> ts += i.next().toString(); >> System.out.println("La String tString est :\n" + ts); >> } >> bw.write(ts); >> bw.flush(); >> } >> } >> ----------------------------------------------------------- >> >> But, at runtime, I still have a similar error message : >> --------------------------- >> 28 avr. 2009 16:49:58 >> org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor >> writeResponseErrorMessage >> ATTENTION: .No message body writer found for response class : ArrayList. >> --------------------------- >> >> So how could the StringListBodyWriter class could be used when the >> List based generic-entity Response is built ? I don't really see when >> the StringListBodyWriter class is called : >> --------------------------- >> return Response.ok(new >> GenericEntity<List<String>>(results){}).entity(results).build(); >> --------------------------- >> >> Thanks, Raphael. >> >> >> 2009/4/23 Sergey Beryozkin <[email protected]>: >>> >>> Hi, >>> >>> One way is to register a message body writer for List which will check if >>> it contains String. It is somewhat primitive but very simple solution >>> which >>> will also scale (as far as handling lists with various types is >>> concerned) >>> quite well. >>> A more type safe way is to register a writer for List<String> and then >>> wrap >>> your list into a GenericEntity : >>> >>> List<String> results = this.getX2dbiResults(fileContent); >>> return Response.ok( >>> new GenericEntity<List<String>>(results)).build(); >>> >>> >>> >>> cheers, Sergey >>> >>> >>> ----- Original Message ----- From: "Raphael F." <[email protected]> >>> To: <[email protected]> >>> Sent: Monday, April 20, 2009 6:26 PM >>> Subject: Error : No message body writer found for response class : >>> ArrayList. - A String is OK... >>> >>> >>> Hello everibody; >>> >>> In my program, i send a file @ /postXML from a client class using >>> HttpClient and PostMethod objects. At server side, I have 2 String >>> objects to return (one with data queried, the second with debug data, >>> both are necessary) in a List<String> object to the client but I have >>> a problem... Here is the server side code : >>> >>> [...] >>> @POST >>> @Path("/postXML") >>> public Response postXML(InputStream fileContent) { >>> >>> List<String> results = this.getX2dbiResults(fileContent); >>> Response resp = Response.ok(results).build(); >>> >>> return resp; >>> } >>> [...] >>> >>> At client side, the code is : >>> >>> [...] >>> RequestEntity entity = new FileRequestEntity(input, "text/xml"); >>> PostMethod post = new PostMethod("http://localhost:9000/postXML";); >>> post.addRequestHeader("Accept", "text/xml"); >>> post.setRequestEntity(entity); >>> >>> HttpClient httpclient = new HttpClient(); >>> >>> try { >>> int result = httpclient.executeMethod(post); >>> System.out.println("Response status code: " + result); >>> System.out.println("Response body: "); >>> System.out.println(post.getResponseBodyAsString()); >>> } >>> finally { >>> post.releaseConnection(); >>> } >>> [...] >>> >>> When i execute client class, I get this message : >>> >>> Response status code: 500 >>> Response body: >>> .No message body writer found for response class : ArrayList. >>> >>> At server side, I have this information : >>> 20 avr. 2009 18:37:16 >>> org.apache.cxf.jaxrs.interceptor.JAXRSOutInterceptor >>> writeResponseErrorMessage >>> .No message body writer found for response class : ArrayList. >>> >>> When I use a String for the result in Response.ok(results).build(), >>> there is no error, so how is it possible to return another entity than >>> String (i.e. an ArrayList) into Response.ok().build() ? >>> >>> Thanks for all. >> >> > > > > -- > Raphaël F. > > L'avenir de nos Libertés Fondamentales passe par la défense de nos > Libertés Numériques ! > Promouvoir et défendre le logiciel libre : http://www.april.org/ > Les projets numériques liberticides du gouvernement français et de > l'Europe : http://www.laquadrature.net/ > OpenOffice.org en images : > http://www.csdm.qc.ca/sitsat-mtl/openoffice/index.htm > "Ce qu'il y a de scandaleux dans le scandale, c'est qu'on s'y > habitue." Méditez-y... > -- Raphaël F. L'avenir de nos Libertés Fondamentales passe par la défense de nos Libertés Numériques ! Promouvoir et défendre le logiciel libre : http://www.april.org/ Les projets numériques liberticides du gouvernement français et de l'Europe : http://www.laquadrature.net/ OpenOffice.org en images : http://www.csdm.qc.ca/sitsat-mtl/openoffice/index.htm "Ce qu'il y a de scandaleux dans le scandale, c'est qu'on s'y habitue." Méditez-y...
