! Implemented CustomHandlerExceptionResolver to return the NoContent status in case of an HttpMessageNotReadableException -> this is not clean enough, since the exception is also raised e.g. on invalid content resulting in a JsonParseException
! Configured CustomHandlerExceptionResolver to be used by springMvc -> ALL ExceptionResolvers need to be configured when overriding the config method.
implemented additional test checking the size of the ExceptionResolver stack configured
! Implemented test for POST requests on a specific resource. Behavior is different than suggested in the article.
! Fixed confusion with 204 status on PUT requests, 204 shall be returned when the server does not return any content in the response
implemented business logic for user deletion
implemented controller method for user deletion and corresponding tests
! added missing @ResponseStatus -> Test did pass, but Rest-client always returned 404 since there is no view associated
added jetty plugin for easy app launching via 'mvn jetty:run'
added logback config to reduce log noise