java - 在以下情况下如果发生失败则如何回滚

Question

以下是根据一些约束将“书目表”，“学生书目”和“保存”到“学生和书本”的映射的类。

class SaveMyDataService {
     @ Transactional(propagation = Propagation.REQUIRES_NEW)
    def saveBooks(List < Book > bookList) {

        /*
        some operation on bookList and then saving each Book Object individually
         */

    }
     @ Transactional(propagation = Propagation.REQUIRES_NEW)
    def saveStudent(List < Student > studentList) {

        /*
        some operation on studentList and then saving each Student Object individually
         */

    }

     @ Transactional(propagation = Propagation.REQUIRES_NEW)
    def saveStudentBookMapping() {

        List < Book > bookList = Book.getAll();
        List < Student > studentList = Studnet.getAll();

        for (int i = 0; i < studnetList.size(); i++) {
            StudentBookMapping obj = new StudentBookMapping();
            /*
            after some operation we map the Book & Student and save the StudentBookMapping Object
             */
            obj.save();
        }

    }

}

该服务类调用SaveMyDataService和其他服务的方法来获取数据，然后进行一些评估
在这种情况下可能会出现异常的地方，我希望回滚所有数据，即书籍，学生及其映射，但无法解决。

class FetchAllNewBooksAndStudent{

    def saveMyDataService;
    def xmlParsingSerivice;
    def evaluationService;

    getStudentAndBooksData()
    {
        try{
        /*
            Some IO operations to get the Student & Book List from XML
        */
        List<Student> studList = xmlParsing.getStudList();
        List<Book> bookList = xmlParsing.getBookList();

        // here we call the save book service
        saveMyDataService.saveBooks(bookList);

        // here we call the save Student service
        saveMyDataService.saveStudent(studList);


        // here we call the mapping service to map the Student & Books
        saveMyDataService.saveStudentBookMapping();

        /*
            after this I do some Evaluation operation but here might be chances of getting exception in such a case I want to rollback all the above entries made like books, student & their mapping but its not working out 
        */

        evaluationService.evaluate();


        }
        catch(Exception e)
        {
            log.error e.getMessage();
        }

    }
}

该作业每隔4小时运行一次，以检查Student / Books / StudentBookMapping的新数据，并调用fetchAllNewBooksAndStudent类的getStudentAndBooksData服务

class RegularBookStudentCheckJob{

    def fetchAllNewBooksAndStudent;

    static triggers = {
        simple repeatInterval: Long.parseLong(ConfigHolder.config.REGULAR_BOOK_STUDENT_CHECK_JOB_REPEAT_INTERVAL), // here value is 4hrs
        startDelay : 60000
    }


    def execute(){

        if(String.valueOf(ConfigHolder.config.RUN_BOOK_STUDENT_CHECK_JOB).equalsIgnoreCase("true"))
        {
            fetchAllNewBooksAndStudent.getStudentAndBooksData();
        }

    }


}

在这里，我的问题是在评估失败的情况下，我期望所有数据都完全回滚，但无法解决，您能告诉我我在哪里出错。

在此先感谢您的帮助!

Answer 1

调用save()方法时，传递failOnError:true的参数，即；保存(failOnError:true)