解决Spring中try catch 无法回滚问题

import org.springframework.transaction.annotation.Transactional;

import org.springframework.transaction.interceptor.TransactionAspectSupport;

@RequestMapping("/deleteclass.do")

@Transactional

public ResultMsg deleteClass(@RequestParam("id") Long id){

try{

    classRepository.deleById(id);

    List<Student> studentList = studentRepository.findByGradeid(id);

    studentRepository.deleteAll(studentList);

    return new ResultMsg(SUCCESS);

}catch(Exception e){

    TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();

    e.printStackTrace();

}

    return new ResultMsg(ERROR);

}