Transactional注解不生效案例-CFANZ编程社区

源码下载

ChaiRongD/Demooo - Gitee.com

不生效场景1：try-catch捕获了

不生效原因：内部逻辑把异常捕获吞了，所以不生效

@Transactional
 public void transactionalNotEffect01() {
    try {
      Person p1 = new Person();
      p1.setName(LocalDateTime.now().toString());
      personDao.insertSelective(p1);
      int i = 1 / 0;
    } catch (Exception e) {
      e.printStackTrace();
      System.out.println("my error");
    }
  }

不生效场景2：方法不使用public修饰

不生效原因：他会判断是不是public，源码中明确规定

Transactional注解不生效案例_java

@Service
public class StudentService {

  @Autowired private PersonDao personDao;


  // 不生效2
  @Transactional
  protected void transactionalNotEffect02() {
    Person p1 = new Person();
    p1.setName(LocalDateTime.now().toString());
    personDao.insertSelective(p1);
    int i = 1 / 0;
  }
  
}

@RestController
public class TransactionalNotEffect02Controller {

  @Autowired private StudentService studentService;

  @GetMapping("/transactionalNotEffect02")
  public Object getAll(){
      studentService.transactionalNotEffect02();
    return 1;
  }
}

不生效场景3：通过this调用，没有走代理方法

不生效原因：自己掉自己的方法，这样方式不会走代理，所以事务失效

 // 不生效3
  public void transactionalNotEffect03() {
    this.addPerson();
  }

  @Transactional
  public void addPerson() {
    Person p1 = new Person();
    p1.setName(LocalDateTime.now().toString());
    personDao.insertSelective(p1);
    int i = 1 / 0;
  }

@RestController
public class StudentController {

  @Autowired private StudentService studentService;

  @GetMapping("/transactionalNotEffect03")
  public Object transactionalNotEffect03() throws Exception {
    studentService.transactionalNotEffect03();
    return 1;
  }
}

不生效场景4：@Transactional 注解属性 propagation 设置错误

不生效原因：见下面的

参考：Spring中propagation的7种事务配置_sayoko06的博客-_propagation

@Service
public class StudentService {

  @Autowired private PersonDao personDao;

  // 不生效4
  @Transactional(propagation= Propagation.NOT_SUPPORTED)
  public void transactionalNotEffect04() {
    Person p1 = new Person();
    p1.setName(LocalDateTime.now().toString());
    personDao.insertSelective(p1);
    int i = 1 / 0;
  }
}

@GetMapping("/transactionalNotEffect04")
  public Object transactionalNotEffect04() throws Exception {
    studentService.transactionalNotEffect04();
    return 1;
  }

不生效场景5：@Transactional的rollbackFor 属性与实际异常不匹配

根本原因：rollbackFor属性监听的是RuntimeException，而下面的代码是FileNotFoundException。不是父子关系，没有交集，匹配失败，所以事务失效。

@Transactional(propagation = Propagation.REQUIRED,rollbackFor = RuntimeException.class)
  public void transactionalNotEffect05() throws Exception{
    Person p1 = new Person();
    p1.setName(LocalDateTime.now().toString());
    personDao.insertSelective(p1);
    //不存在的文件
    int read = new FileInputStream(new File("D://尚硅谷周阳老师//1.txt")).read();
  }

不生效场景6：数据库引擎不支持事务

不生效场景7：线程不同不支持事务

不生效原因：事务回滚的单位是建立在connection上，而connection是存在ThreadLocal中，因为不同的线程ThreadLocal存的connection自然不一样，那该场景就不符合预期（都回滚）了。

// 不生效7
  @Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
  public void transactionalNotEffect07() {
    Person p1 = new Person();
    p1.setName(LocalDateTime.now().toString());
    personDao.insertSelective(p1);
    new Thread(
            () -> {
              Person p2 = new Person();
              p2.setName(LocalDateTime.now().toString());
              personDao.insertSelective(p2);
              int i = 1 / 0;
            },
            "t1")
        .start();
  }