@@ -0,0 +1,307 @@
+package ch.uzh.csg.reimbursement.model.exception;%0A%0A@SuppressWarnings(%22serial%22)%0Apublic class ValidationException extends BusinessException %7B%0A%09%0A%09private final static String MESSAGE = %22The passed string did not match the regex for key: %22;%0A%09%0A%09public ValidationException(String key)%7B%0A%09%09super(MESSAGE + key);%0A%09%7D%0A%7D

Add Exception class.