事务概念略;
由事务的传播行为我们知道, 如果将方法配置为默认事务(REQUIRED)在执行过程中Spring会为其新启事务(REQUIRES_NEW), 作为一个独立事务来执行. 由此存在一个问题.
如果使用不慎, 会引发 org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
具体原因见以下demo简例:
部分关键代码
DemoService1
代码语言：javascript复制public class DemoService1Impl implements DemoService1 {
private final Logger logger = LoggerFactory.getLogger(this.getClass());
@Resource
private DemoDao demoDao;
@Resource
private DemoService2 demoService2;
/**
* 业务逻辑 , 默认事务, 事务回滚异常 : Exception
*/
@Override
@Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
public void doService() {
HashMap<String, Integer> param = new HashMap<>(2);
param.put("applId", 19);
param.put("code", 19);
demoDao.insert1(param);
try {
demoService2.doService();
} catch (Exception e) {
logger.error("业务2处理异常,{}", e.getMessage());
}
}
}DemoService2
代码语言：javascript复制public class DemoService2Impl implements DemoService2 {
@Resource
private DemoDao demoDao;
/**
* 业务逻辑, 默认事务, 事务回滚异常 : Exception
*/
@Override
@Transactional(propagation = Propagation.REQUIRED,rollbackFor = Exception.class)
public void doService() {
HashMap<String, Integer> param = new HashMap<>(2);
param.put("applId", 10);
param.put("code", 10);
demoDao.insert2(param);
throw new RuntimeException("因为一些原因,我处理失败了.");
}
}单元测试
代码语言：javascript复制public class DemoService1ImplTest extends BaseTest {
@Resource
private DemoService1 demoService1;
@Test
public void doService() {
demoService1.doService();
}
}说明
这里用到的事务配置为注解方式, 目前我们项目开发过程中使用配置文件方式, 一般为以下方式 . 这种方式的事务配置, 更容易引起问题
代码语言：javascript复制 <tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
...
<tx:method name="do*" />
<tx:method name="doNew*" propagation="REQUIRES_NEW" />
...
</tx:attributes>
</tx:advice>执行结果
代码语言：javascript复制27:38 [DEBUG] - [com.erayt.cms.cms.dao.DemoDao.insert1] prepare sql:[ insert into ...
27:38 [DEBUG] - [com.erayt.cms.cms.dao.DemoDao.insert1] prepare parameters:[19, 19] ...
27:38 [DEBUG] - {pstm-100001} Executing Statement: insert into ...
27:38 [DEBUG] - {pstm-100001} Types: [java.lang.Integer, java.lang.Integer] ...
27:38 [DEBUG] - [com.erayt.cms.cms.dao.DemoDao.insert2] prepare sql:[ insert into ...
27:38 [DEBUG] - [com.erayt.cms.cms.dao.DemoDao.insert2] prepare parameters:[10, 10] ...
27:38 [DEBUG] - {conn-100002} Preparing Statement: insert into ...
27:38 [DEBUG] - {pstm-100003} Types: [java.lang.Integer, java.lang.Integer] ...
27:38 [ERROR] - 业务2处理异常,因为一些原因,我处理失败了.
27:38 [WARN ] - Caught exception while allowing TestExecutionListener ...
org.springframework.transaction.UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit ...
at org.springframework.test.context.transaction.TransactionContext.endTransaction ...
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.afterTestMethod ...
at org.springframework.test.context.TestContextManager.afterTestMethod ...问题分析
问题出现的代码为
代码语言：javascript复制 try {
demoService2.doService();
} catch (Exception e) {
logger.error("业务2处理异常,{}", e.getMessage());
}问题原因是因为两个service中的方法doService均为默认事务(REQUIRED),
默认事务再被调用时, 如外层方法无事务, 自身会新启事务. 此时#demoService1.doService()的事务则为新启事务(REQUIRES_NEW) , 之后再被调用的方法#demoService2.doService()会加入到调用者#demoService1.doService()事务中.
又由于spring的事务回滚依托在异常之上, 当demoService2.doService()出现异常后它将事务标记为回滚. 异常抛出后被catch , demoService1.doService 没有接受到里面抛出的异常, 方法继续执行, 执行结束后, 事务提交.
但当demoService1在做commit的时候检测到事务被标记为回滚, 与预期不符, 也就是Unexpected 意想不到的
UnexpectedRollbackException: Transaction rolled back because it has been marked as rollback-only
