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.
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