I solved guys!, it just was a matter of adding writer.flush(); at the end of
the method 'writeTo'
But I don't remember I added that line to plain Tomcat, well, it's solved
anyway,
The code is here maybe some of you find it useful
@Provider
@Produces(MediaType.APPLICATION_JSON)
@Consumes(MediaType.APPLICATION_JSON)
public class GsonJsonProvider<T> implements MessageBodyReader<T>,
MessageBodyWriter<T> {
private Gson gson;
public GsonJsonProvider() {
gson = new Gson();
}
@Override
public boolean isReadable(Class<?> type, Type genericType, Annotation[]
annotations, MediaType mediaType) {
return true;
}
@Override
public T readFrom(Class<T> type, Type genericType, Annotation[]
annotations, MediaType mediaType, MultivaluedMap<String, String>
httpHeaders,
InputStream entityStream) throws IOException,
WebApplicationException {
InputStreamReader streamReader = new InputStreamReader(entityStream,
StandardCharsets.UTF_8);
return gson.fromJson(streamReader, type);
}
@Override
public boolean isWriteable(Class<?> type, Type genericType, Annotation[]
annotations, MediaType mediaType) {
return true;
}
@Override
public long getSize(T t, Class<?> type, Type genericType, Annotation[]
annotations, MediaType mediaType) {
return -1;
}
@Override
public void writeTo(T t, Class<?> type, Type genericType, Annotation[]
annotations,
MediaType mediaType, MultivaluedMap<String, Object> httpHeaders,
OutputStream entityStream) throws IOException, WebApplicationException {
OutputStreamWriter writer = new OutputStreamWriter(entityStream,
StandardCharsets.UTF_8);
gson.toJson(t, writer);
writer.flush(); //This line is the path to success!
}
}
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