private void serializeValue(final HttpServletResponse pResponse, Object value)
      throws TransformerException, IOException, FactoryConfigurationError {
    if (value instanceof Source) {
      setContentType(pResponse, "application/binary"); // Unknown content type
      Sources.writeToStream((Source) value, pResponse.getOutputStream());
    } else if (value instanceof Node) {
      pResponse.setContentType("text/xml");
      Sources.writeToStream(new DOMSource((Node) value), pResponse.getOutputStream());
    } else if (value instanceof XmlSerializable) {
      pResponse.setContentType("text/xml");
      XMLOutputFactory factory = XMLOutputFactory.newInstance();
      factory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, Boolean.TRUE);
      try {
        XmlWriter out =
            XmlStreaming.newWriter(
                pResponse.getOutputStream(), pResponse.getCharacterEncoding(), true);
        try {
          out.startDocument(null, null, null);
          ((XmlSerializable) value).serialize(out);
          out.endDocument();
        } finally {
          out.close();
        }
      } catch (XmlException e) {
        throw new TransformerException(e);
      }
    } else if (value instanceof Collection) {
      final XmlElementWrapper annotation = getElementWrapper();
      if (annotation != null) {
        setContentType(pResponse, "text/xml");
        try (OutputStream outStream = pResponse.getOutputStream()) {

          writeCollection(
              outStream, getGenericReturnType(), (Collection<?>) value, getQName(annotation));
        }
      }
    } else if (value instanceof CharSequence) {
      setContentType(pResponse, "text/plain");
      pResponse.getWriter().append((CharSequence) value);
    } else {
      if (value != null) {
        try {
          final JAXBContext jaxbContext = JAXBContext.newInstance(getReturnType());
          setContentType(pResponse, "text/xml");

          final JAXBSource jaxbSource = new JAXBSource(jaxbContext, value);
          Sources.writeToStream(jaxbSource, pResponse.getOutputStream());

        } catch (final JAXBException e) {
          throw new MessagingException(e);
        }
      }
    }
  }
 private void writeCollection(
     final OutputStream outputStream,
     final Type collectionType,
     final Collection<?> collection,
     final QName outerTagName) {
   final Class<?> rawType;
   if (collectionType instanceof ParameterizedType) {
     final ParameterizedType returnType = (ParameterizedType) collectionType;
     rawType = (Class<?>) returnType.getRawType();
   } else if (collectionType instanceof Class<?>) {
     rawType = (Class<?>) collectionType;
   } else if (collectionType instanceof WildcardType) {
     final Type[] UpperBounds = ((WildcardType) collectionType).getUpperBounds();
     if (UpperBounds.length > 0) {
       rawType = (Class<?>) UpperBounds[0];
     } else {
       rawType = Object.class;
     }
   } else if (collectionType instanceof TypeVariable) {
     final Type[] UpperBounds = ((TypeVariable<?>) collectionType).getBounds();
     if (UpperBounds.length > 0) {
       rawType = (Class<?>) UpperBounds[0];
     } else {
       rawType = Object.class;
     }
   } else {
     throw new IllegalArgumentException("Unsupported type variable");
   }
   Class<?> elementType;
   if (Collection.class.isAssignableFrom(rawType)) {
     final Type[] paramTypes = Types.getTypeParametersFor(Collection.class, collectionType);
     elementType = Types.toRawType(paramTypes[0]);
     if (elementType.isInterface()) {
       // interfaces not supported by jaxb
       elementType = Types.commonAncestor(collection);
     }
   } else {
     elementType = Types.commonAncestor(collection);
   }
   try {
     // As long as JAXB is an option, we have to know that this is a StAXWriter as JAXB needs to
     // write to that.
     try (XmlWriter xmlWriter = XmlStreaming.newWriter(outputStream, "UTF-8")) {
       Marshaller marshaller = null;
       XmlWriterUtil.smartStartTag(xmlWriter, outerTagName);
       for (Object item : collection) {
         if (item != null) {
           if (item instanceof XmlSerializable) {
             ((XmlSerializable) item).serialize(xmlWriter);
           } else if (item instanceof Node) {
             XmlWriterUtil.serialize(xmlWriter, (Node) item);
           } else {
             if (marshaller == null) {
               JAXBContext jaxbcontext = null;
               if (elementType == null) {
                 jaxbcontext = newJAXBContext(JAXBCollectionWrapper.class);
               } else {
                 jaxbcontext = newJAXBContext(JAXBCollectionWrapper.class, elementType);
               }
               marshaller = jaxbcontext.createMarshaller();
             }
             marshaller.marshal(item, (XMLStreamWriter) getDelegateMethod().invoke(xmlWriter));
           }
         }
       }
       XmlWriterUtil.endTag(xmlWriter, outerTagName);
     }
   } catch (Throwable e) {
     throw new MessagingException(e);
   }
 }