super.deleteDomainObject();
    public void delete() {        if (this.getAssociatedSummariesCount() > 0 || this.getAssociatedShiftProfessorshipCount() > 0                || this.getSupportLessonsCount() > 0)            throw new DomainException(this.getClass().getName(), "");        this.setExecutionCourse(null);        this.setTeacher(null);    }