throw new DomainException("error.exception.existing.groupProperties");
throw new DomainException(this.getClass().getName(), "error.exception.existing.groupProperties");
    private void checkIfGroupingAlreadyExists(String groupingName) {        if (!this.getName().equals(groupingName)) {            for (final IExecutionCourse executionCourse : this.getExecutionCourses()) {                if (executionCourse.getGroupingByName(groupingName) != null) {                    throw new DomainException("error.exception.existing.groupProperties");                }            }        }    }