java - 使用 Spring @Transactional 进行 TestNG 多线程测试

Question

我正在使用 TestNG 测试持久性 Spring 模块 (JPA+Hibernate)，使用 AbstractTransactionalTestNGSpringContextTests 作为基类。所有重要部分@Autowired、@TransactionConfiguration、@Transactional 都可以正常工作。

当我尝试使用 threadPoolSize=x, invocationCount=y TestNG 注释在并行线程中运行测试时出现问题。

WARNING: Caught exception while allowing TestExecutionListener [org.springframework.test.context.transaction.TransactionalTestExecutionListener@174202a] 
to process 'before' execution of test method [testCreate()] for test instance [DaoTest] java.lang.IllegalStateException:
Cannot start new transaction without ending existing transaction: Invoke endTransaction() before startNewTransaction().
at org.springframework.test.context.transaction.TransactionalTestExecutionListener.beforeTestMethod(TransactionalTestExecutionListener.java:123)
at org.springframework.test.context.TestContextManager.beforeTestMethod(TestContextManager.java:374)
at org.springframework.test.context.testng.AbstractTestNGSpringContextTests.springTestContextBeforeTestMethod(AbstractTestNGSpringContextTests.java:146)

...有人遇到过这个问题吗？

代码如下:

@TransactionConfiguration(defaultRollback = false)
@ContextConfiguration(locations = { "/META-INF/app.xml" })
public class DaoTest extends AbstractTransactionalTestNGSpringContextTests {

@Autowired
private DaoMgr dm;

@Test(threadPoolSize=5, invocationCount=10)
public void testCreate() {
    ...
    dao.persist(o);
    ...
}
...

更新: AbstractTransactionalTestNGSpringContextTests 似乎只为主线程维护事务，而所有其他测试线程都没有获得自己的事务实例。解决这个问题的唯一方法是扩展 AbstractTestNGSpringContextTests 并以编程方式维护事务(而不是 @Transactional 注释)每个方法(即使用 TransactionTemplate):

@Test(threadPoolSize=5, invocationCount=10)
public void testMethod() {
    new TransactionTemplate(txManager).execute(new TransactionCallbackWithoutResult() {
        @Override
        protected void doInTransactionWithoutResult(TransactionStatus status) {
            // transactional test logic goes here
        }
    }
}

Answer 1

事务需要在同一个线程中启动，这里有更多细节:

Spring3/Hibernate3/TestNG: some tests give LazyInitializationException, some don't