return true;
return new Boolean(true);
	public boolean run(String username, Integer examId)		throws FenixServiceException {		try {			ISuportePersistente sp = SuportePersistenteOJB.getInstance();			IPersistentStudent persistentStudent = sp.getIPersistentStudent();			IStudent student = persistentStudent.readByUsername(username);			IPersistentExam persistentExam = sp.getIPersistentExam();			IExam exam = new Exam();			exam.setIdInternal(examId);			exam = (IExam) persistentExam.readByOId(exam);			if (exam == null || student == null) {				throw new InvalidArgumentsServiceException();			}			if ( student.getExamsEnrolled().contains(exam)) {				throw new ExistingServiceException();			}		//	exam.getStudentsEnrolled().add(student);			student.getExamsEnrolled().add(exam);		} catch (ExcepcaoPersistencia e) {			throw new FenixServiceException(e);		}		return true;	}