spring事务失效的几种场景以及原因

  前言

  spring事务失效场景可能大家在很多文章都看过了,所以今天就水一篇,看大家能不能收获一些不一样的东西。直接进入主题

  spring事务失效场景以及原因

  1、场景一:service没有托管给spring

  public class TranInvalidCaseWithoutInjectSpring {

  private UserService userService;

  public TranInvalidCaseWithoutInjectSpring(UserService userService) {

  this.userService = userService;

  }

  @Transactional

  public boolean add(User user){

  boolean isSuccess = userService.save(user);

  int i = 1 % 0;

  return isSuccess;

  }

  }

  @Test

  public void testServiceWithoutInjectSpring(){

  boolean randomBoolean = new Random().nextBoolean();

  TranInvalidCaseWithoutInjectSpring tranInvalidCaseWithoutInjectSpring;

  if(randomBoolean){

  tranInvalidCaseWithoutInjectSpring = applicationContext.getBean(TranInvalidCaseWithoutInjectSpring.class);

  System.out.println("service已经被spring托管");

  }else{

  tranInvalidCaseWithoutInjectSpring = new TranInvalidCaseWithoutInjectSpring(userService);

  System.out.println("service没被spring托管");

  }

  boolean isSuccess = tranInvalidCaseWithoutInjectSpring.add(user);

  Assert.assertTrue(isSuccess);

  }

  失效原因: spring事务生效的前提是,service必须是一个bean对象 解决方案: 将service注入spring

  2、场景二:抛出受检异常

  @Service

  public class TranInvalidCaseByThrowCheckException {

  @Autowired

  private UserService userService;

  @Transactional

  public boolean add(User user) throws FileNotFoundException {

  boolean isSuccess = userService.save(user);

  new FileInputStream("1.txt");

  return isSuccess;

  }

  }

  @Test

  public void testThrowCheckException() throws Exception{

  boolean randomBoolean = new Random().nextBoolean();

  boolean isSuccess = false;

  TranInvalidCaseByThrowCheckException tranInvalidCaseByThrowCheckException = applicationContext.getBean(TranInvalidCaseByThrowCheckException.class);

  if(randomBoolean){

  System.out.println("配置@Transactional(rollbackFor = Exception.class)");

  isSuccess = tranInvalidCaseByThrowCheckException.save(user);

  }else{

  System.out.println("配置@Transactional");

  tranInvalidCaseByThrowCheckException.add(user);

  }

  Assert.assertTrue(isSuccess);

  }

  失效原因: spring默认只会回滚非检查异常和error异常 解决方案: 配置rollbackFor

  3、场景三:业务自己捕获了异常

  @Transactional

  public boolean add(User user) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  }

  return isSuccess;

  }

  @Test

  public void testCatchExecption() throws Exception{

  boolean randomBoolean = new Random().nextBoolean();

  boolean isSuccess = false;

  TranInvalidCaseWithCatchException tranInvalidCaseByThrowCheckException = applicationContext.getBean(TranInvalidCaseWithCatchException.class);

  if(randomBoolean){

  randomBoolean = new Random().nextBoolean();

  if(randomBoolean){

  System.out.println("将异常原样抛出");

  tranInvalidCaseByThrowCheckException.save(user);

  }else{

  System.out.println("设置TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();");

  tranInvalidCaseByThrowCheckException.addWithRollBack(user);

  }

  }else{

  System.out.println("业务自己捕获了异常");

  tranInvalidCaseByThrowCheckException.add(user);

  }

  Assert.assertTrue(isSuccess);

  }

  失效原因: spring事务只有捕捉到了业务抛出去的异常,才能进行后续的处理,如果业务自己捕获了异常,则事务无法感知 解决方案: 1、将异常原样抛出; 2、设置TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();

  4、场景四:切面顺序导致

  @Service

  public class TranInvalidCaseWithAopSort {

  @Autowired

  private UserService userService;

  @Transactional

  public boolean save(User user) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  }

  @Aspect

  @Component

  @Slf4j

  public class AopAspect {

  @Around(value = " execution (* com.github.lybgeek.transcase.aopsort..*.*(..))")

  public Object around(ProceedingJoinPoint pjp){

  try {

  System.out.println("这是一个切面");

  return pjp.proceed();

  } catch (Throwable throwable) {

  log.error("{}",throwable);

  }

  return null;

  }

  }

  失效原因: spring事务切面的优先级顺序最低,但如果自定义的切面优先级和他一样,且自定义的切面没有正确处理异常,则会同业务自己捕获异常的那种场景一样 解决方案: 1、在切面中将异常原样抛出; 2、在切面中设置TransactionAspectSupport.currentTransactionStatus().setRollbackOnly();

  5、场景五:非public方法

  @Service

  public class TranInvalidCaseWithAccessPerm {

  @Autowired

  private UserService userService;

  @Transactional

  protected boolean save(User user){

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  }

  public class TranInvalidCaseWithAccessPermTest {

  public static void main(String[] args) {

  ConfigurableApplicationContext context = SpringApplication.run(Application.class);

  TranInvalidCaseWithAccessPerm tranInvalidCaseWithAccessPerm = context.getBean(TranInvalidCaseWithAccessPerm.class);

  boolean isSuccess = tranInvalidCaseWithAccessPerm.save(UserUtils.getUser());

  System.out.println(isSuccess);

  }

  }

  失效原因: spring事务默认生效的方法权限都必须为public

  解决方案: 1、将方法改为public; 2、修改TansactionAttributeSource,将publicMethodsOnly改为false【这个从源码跟踪得出结论】 3、开启 AspectJ 代理模式【从spring文档得出结论】

  文档如下

  Method visibility and @Transactional When using proxies, you should apply the @Transactional annotation only to methods with public visibility. If you do annotate protected, private or package-visible methods with the @Transactional annotation, no error is raised, but the annotated method does not exhibit the configured transactional settings. Consider the use of AspectJ (see below) if you need to annotate non-public methods.

  具体步骤:

  1、在pom引入aspectjrt坐标以及相应插件

  <dependency>

  <groupId>org.aspectj</groupId>

  <artifactId>aspectjrt</artifactId>

  <version>1.8.9</version>

  </dependency>

  <plugin>

  <groupId>org.codehaus.mojo</groupId>

  <artifactId>aspectj-maven-plugin</artifactId>

  <version>1.9</version>

  <configuration>

  <showWeaveInfo>true</showWeaveInfo>

  <aspectLibraries>

  <aspectLibrary>

  <groupId>org.springframework</groupId>

  <artifactId>spring-aspects</artifactId>

  </aspectLibrary>

  </aspectLibraries>

  </configuration>

  <executions>

  <execution>

   <goals>

  <goal>compile</goal> <!-- use this goal to weave all your main classes -->

  <goal>test-compile</goal> <!-- use this goal to weave all your test classes -->

  </goals>

  </execution>

  </executions>

  </plugin>

  2、在启动类上加上如下配置

  @EnableTransactionManagement(mode = AdviceMode�transactionTemplate.execute(new TransactionCallbackWithoutResult() {

  @Override

  protected void doInTransactionWithoutResult(TransactionStatus status) {

  processInTransaction();

  }

  });

  }

  6、场景六:父子容器

  失效原因: 子容器扫描范围过大,将未加事务配置的serivce扫描进来

  解决方案: 1、父子容器个扫个的范围; 2、不用父子容器,所有bean都交给同一容器管理

  注: 因为示例是使用springboot,而springboot启动默认没有父子容器,只有一个容器,因此就该场景就演示示例了

  7、场景七:方法用final修饰

  @Transactional

  public final boolean add(User user, UserService userService) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  失效原因: 因为spring事务是用动态代理实现,因此如果方法使用了final修饰,则代理类无法对目标方法进行重写,植入事务功能

  解决方案: 1、方法不要用final修饰

  8、场景八:方法用static修饰

  @Transactional

  public static boolean save(User user, UserService userService) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  失效原因: 原因和final一样

  解决方案: 1、方法不要用static修饰

  9、场景九:调用本类方法

  public boolean save(User user) {

  return this.saveUser(user);

  }

  @Transactional

  public boolean saveUser(User user) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  失效原因: 本类方法不经过代理,无法进行增强

  解决方案: 1、注入自己来调用; 2、使用@EnableAspectJAutoProxy(exposeProxy = true) + AopContext.currentProxy()

  10、场景十:多线程调用

  @Transactional(rollbackFor = Exception.class)

  public boolean save(User user) throws ExecutionException, InterruptedException {

  Future<Boolean> future = executorService.submit(() -> {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new Exception();

  }

  return isSuccess;

  });

  return future.get();

  }

  失效原因: 因为spring的事务是通过数据库连接来实现,而数据库连接spring是放在threadLocal里面。同一个事务,只能用同一个数据库连接。而多线程场景下,拿到的数据库连接是不一样的,即是属于不同事务

  11、场景十一:错误的传播行为

  @Transactional(propagation = Propagation.NOT_SUPPORTED)

  public boolean save(User user) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  失效原因: 使用的传播特性不支持事务

  12、场景十二:使用了不支持事务的存储引擎

  失效原因: 使用了不支持事务的存储引擎。比如mysql中的MyISAM

  13、场景十三:数据源没有配置事务管理器

  注: 因为springboot,他默认已经开启事务管理器。org.springframework.boot.autoconfigure.jdbc.DataSourceTransactionManagerAutoConfiguration。因此示例略过

  14、场景十四:被代理的类过早实例化

  @Service

  public class TranInvalidCaseInstantiatedTooEarly implements BeanPostProcessor , Ordered {

  @Autowired

  private UserService userService;

  @Transactional

  public boolean save(User user) {

  boolean isSuccess = userService.save(user);

  try {

  int i = 1 % 0;

  } catch (Exception e) {

  throw new RuntimeException();

  }

  return isSuccess;

  }

  @Override

  public int getOrder() {

  return 1;

  }

  }

  失效原因: 当代理类的实例化早于AbstractAutoProxyCreator后置处理器,就无法被AbstractAutoProxyCreator后置处理器增强

  总结

  本文列举了14种spring事务失效的场景,其实这14种里面有很多都是归根结底都是属于同一类问题引起,比如因为动态代理原因、方法限定符原因、异常类型原因等.ASPECTJ)

  注: 如果是在idea上运行,则需做如下配置

  在这里插入图片描述

  4、直接用TransactionTemplate

  示例:

  @Autowired

  private TransactionTemplate transactionTemplate;

  private void process(){

 �

posted @   Vhjch  阅读(365)  评论(0编辑  收藏  举报
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