ResourceMethod::invokeOnTarget calls methodInjector.invoke() and then sets the PostProcessers afterwards. If the method sets the response directly or the executing thread finishes quicker the PostProcessers /Annotations /MessageBodyWriters do not get processed.

Object rtn = null;
try

{ rtn = methodInjector.invoke(request, response, target); }

catch (WebApplicationException wae)

{ prepareResponse(ServerResponse.copyIfNotServerResponse(wae.getResponse())); throw wae; }

if (request.isSuspended())

{ AbstractAsynchronousResponse asyncResponse = (AbstractAsynchronousResponse) request.getAsynchronousResponse(); if (asyncResponse == null) return null; asyncResponse.setAnnotations(method.getAnnotations()); asyncResponse.setMessageBodyWriterInterceptors(writerInterceptors); asyncResponse.setPostProcessInterceptors(postProcessInterceptors); return null; }