here are some lines of code which basicly allow to wrap a dto objet in to a javascript method callback.

@Produces("text/javascript")
public class JsonpProvider implements MessageBodyWriter<Object> {
...
public void writeTo(final Object object, final Class<?> clazz, final Type type, final Annotation[] annotations,
final MediaType mediaType, final MultivaluedMap<String, Object> multivaluedMap, final OutputStream out)
throws IOException, WebApplicationException {

out.write(methodName);
if (clazz != null && !clazz.equals(Object.class)) {
MessageBodyWriter writer = providers.getMessageBodyWriter(clazz, type, annotations,
MediaType.APPLICATION_JSON_TYPE);
if (writer != null)

{ writer.writeTo(object, clazz, type, annotations, MediaType.APPLICATION_JSON_TYPE, multivaluedMap, out); }

else

{ .... }

} else

{ out.write(emptyJsonObject); }

out.write(methodEnd);
}
}

This would work with annotating a method with @Produces(text/javascript). The only problem is the injection of the javascript method name. This could be configured in xml or by additional annotation.