@Override
 public Object findContentDeserializer(Annotated a) {
   JsonDeserialize ann = _findAnnotation(a, JsonDeserialize.class);
   if (ann != null) {
     Class<? extends JsonDeserializer<?>> deserClass = ann.contentUsing();
     if (deserClass != JsonDeserializer.None.class) {
       return deserClass;
     }
   }
   return null;
 }