private void rejectMessageCommand(final MessageCommand command, final ActorRef sender) { final MessageSendNotAllowedException error = MessageSendNotAllowedException.newBuilder(command.getThingId()) .dittoHeaders(command.getDittoHeaders()) .build(); log(command).info( "The command <{}> was not forwarded due to insufficient rights {}: {} - AuthorizationSubjects: {}", command.getType(), error.getClass().getSimpleName(), error.getMessage(), command.getDittoHeaders().getAuthorizationSubjects()); replyToSender(error, sender); }