code: public <T> void addClassDeserializer(Class<T> classToMap, JsonDeserializer<? extends T> classDeserializer) {
          setNewObjectMapper(); // Is this right, setting a new object mapper on each add operation?
          SimpleModule mod = new SimpleModule("GeolatteCommonModule-" + classDeserializer.getClass().getSimpleName());
          mod.addDeserializer(classToMap, classDeserializer);
          mapper.registerModule(mod);
      }
docs: Adds a deserializer to this mapper. Allows a user to alter the deserialization behavior for a certain type.
  
  @param classToMap      the class for which the given serializer is meant
  @param classDeserializer the serializer
  @param <T>             the type of objects that will be serialized by the given serializer