もう一度試したコードを実行するとこの例外が発生しますが、継続的に問題が発生しています。今回は1人がテストを行っているため、同期タイプのエラーが発生しているため、学生はテストを行うことができませんでした
....:
Caused by: org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction (or unsaved-value mapping was incorrect)
私のコード:
public synchronized StudentAnswer saveAnswer(User user, String assignmentid, String answerid, String answer) throws Exception {
if (user == null || user.getStudent() == null)
throw new GeneralSecurityException("Permission Denied");
Auditor auditor = new Auditor(user);
AssignmentStatus status = getAssignmentStatus(user, assignmentid);
StudentAnswer studentAnswer = getStudentAnswer(user, assignmentid, answerid);
Object oldStatus = auditor.clone(status, new AssignmentStatus());
//Object oldAnswer = auditor.clone(studentAnswer, new StudentAnswer());
Object oldAnswer = auditor.clone((studentAnswer == null) ? new StudentAnswer() : studentAnswer, new StudentAnswer());
Date now = new Date();
if (status != null && status.isCompleted())
return studentAnswer;
if (studentAnswer == null) {
Assignment assignment = getAssignment(user, assignmentid);
AnswerKey answerKey = (AnswerKey) genericDao.get(AnswerKey.class, answerid);
if (answerKey == null)
throw new Exception("There was an error trying to save an answer.");
if (status == null)
status = startAssignment(user, assignment, now);
if (status == null)
throw new Exception("There was an error trying to start the assignment.");
studentAnswer = new StudentAnswer();
studentAnswer.setStudent(user.getStudent());
studentAnswer.setCreateTime(now);
studentAnswer.setAssignmentStatus( status );
studentAnswer.setAssignment(assignment);
studentAnswer.setAnswerKey( answerKey );
studentAnswer.setQuestionNumber( answerKey.getNumber() );
studentAnswer.setAnswerKeyCopy( answerKey.getAnswer() );
//Adding a new answer changes your progress percentage, so we recalculate it
updateProgress(status, now, answer);
}
//changing existing answer
else {
Long practiceId = studentAnswer.getAnswerKey().getPractice().getObjectid();
PracticeStatus practiceStatus = null;
for (PracticeStatus tmpPracticeStatus : (List<PracticeStatus>) status.getPracticeStatuses()) {
if (tmpPracticeStatus.getCustomPractice().getPractice().getObjectid().longValue() == practiceId.longValue()) {
practiceStatus = tmpPracticeStatus;
}
}
//completed practice due to time out or submit? Don't change the
//answer.
if (practiceStatus != null && practiceStatus.isCompleted()) {
throw new Exception("Time is up for this practice, so answers may no longer be changed.");
//return studentAnswer;
}
}
if (answer!=null && answer.length() > 0)
studentAnswer.setAnswer(answer.charAt(0));
else
studentAnswer.setAnswer(' ');
studentAnswer.setUpdateTime(now);
studentAnswer = (StudentAnswer) genericDao.save(studentAnswer);
updateGrade(status);
updateProgress(status, now, null);
genericDao.save(status);
auditor.audit("answer_save", status, oldStatus);
auditor.audit("answer_save", studentAnswer, oldAnswer);
genericDao.saveList(auditor.getList());
return studentAnswer;
}