spring事务回滚

// 事务回滚demo
@RequestMapping(value = "/testStudents",method = RequestMethod.POST)
@Transactional
public String gktllkiy(Student student) {
    // 保存
    try {
        //int result = userService.addStudent(student);
        student.setName("士大夫11");
        int result1 = userService.addStudent(student);//新增数据
        Student t2 = null;
        System.out.println(t2.c());
        student.setName("错误的事务");
        int result2 = userService.addStudent(student);
    } catch (Exception e) {
        e.printStackTrace();
        TransactionAspectSupport.currentTransactionStatus().setRollbackonly();//就是这一句了，加上之后，如果抛了空指针异常, //前面新是会回滚的
    }
    return null;
}

@Data
public class Student {

    private Long id;
    private String name;
    private Long age;
    private Long conut;

    public String c(){
        return "123";
    }
}

运行图：

最后事务回滚