IMO, you should not be flushing anything and just let the framework flush the content for you once it is done processing the outbound message…
Marek
> On 23 Jan 2015, at 17:07, Mikael Ståldal <mikael.staldal_at_appearnetworks.com> wrote:
>
> I have a javax.ws.rs.ext.MessageBodyWriter like this:
>
> @Provider
> @Produces({MediaType.APPLICATION_JSON})
> public class JsonMessageBodyWriter extends MessageBodyWriter<Object> {
>
> @Override
> public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
> return true;
> }
>
> @Override
> public long getSize(Object t, Class<?> type, Type genericType, Annotation[] annotations, mediaType) {
> return -1;
> }
>
> public void writeTo(Object t, Class<?> type, Type genericType,
> Annotation[] annotations,
> MediaType mediaType,
> MultivaluedMap<String, Object> httpHeaders,
> OutputStream entityStream)
> throws java.io.IOException, javax.ws.rs.WebApplicationException {
>
> OutputStreamWriter writer = new OutputStreamWriter(entityStream, "UTF-8");
>
> // this will not flush() nor close() writer
> SuperCoolJsonLibrary.serializeObjectToWriter(t, writer);
>
> writer.flush(); // problem here
> }
>
> }
>
> I think I need to do something at the end of MessageBodyWriter.writeTo(), otherwise there may be some data left buffered inside the OutputStreamWriter. But OutputStreamWriter.flush() will flush the entityStream I get from Jersey runtime a well, and that seems to cause this problem for me:
>
> http://w3facility.org/question/java-is-flush-needed-before-close-of-a-printwriter-buffer-stream/ <http://w3facility.org/question/java-is-flush-needed-before-close-of-a-printwriter-buffer-stream/>
>
> How should this be done? OutputStreamWriter have a flushBuffer() method which seems to do what I need, but it is not public :-(
>
> I use Linux, Oracle JDK 1.8.0_20, jetty-9.0.3.v20130506, Jersey 2.15.
>
> --
> Mikael Ståldal
> Chief Software Architect
> Appear
> Phone: +46 8 545 91 572 <>
> Email: mikael.staldal_at_appearnetworks.com <mailto:mikael.staldal_at_appearnetworks.com>