防止内部事务回滚外部事务

Question

我有一个有点复杂的事务，它创建或不创建许多不同类型的实体。如果由于验证错误而无法创建其中一个实体，我想简单地捕获 ConstraintValidationError 并继续（允许在同一事务中创建的任何其他实体成功保存）。

我可以成功执行此操作，但验证错误仍将我的整个事务标记为回滚，这是我不想要的。

我尝试更改导致 ConstraintValidationError 的单一验证方法：

@Transactional(propagation = Propagation.NOT_SUPPORTED)

强制一个新事务，认为它只会标记那个新的内部事务以进行回滚，但事实并非如此。

调用类标有：

@Transactional(noRollbackFor=ConstraintViolationException.class)

但是如果 ConstraintViolationException 在被调用的方法中并且我不希望将其添加到被调用的方法中，这将无济于事。

这样做的正确方法是什么？

（如果需要代码，请告诉我——这个例子有点复杂。）

编辑（2014 年 5 月 26 日）：

当我尝试时

progration = Propagation.REQUIRES_NEW

我发现结果没有变化。此特定日志来自一个测试，该测试故意尝试保存具有空描述的“部门”实体对象，这将是无效的：

11:46:43.599 [main] DEBUG org.springframework.transaction.annotation.AnnotationTransactionAttributeSource - Adding transactional method 'DefaultCourseManager.saveDepartment' with attribute: PROPAGATION_REQUIRES_NEW,ISOLATION_DEFAULT; ''
11:46:43.599 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'transactionManager'
11:46:43.599 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Found thread-bound EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@3a90c13c] for JPA transaction
11:46:43.599 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Suspending current transaction, creating new transaction with name [edu.ucdavis.dss.dw.site.DefaultCourseManager.saveDepartment]
11:46:43.600 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Opened new EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@67b355c8] for JPA transaction
11:46:43.600 [main] DEBUG org.hibernate.engine.transaction.spi.AbstractTransactionImpl - begin
11:46:43.600 [main] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Obtaining JDBC connection
11:46:43.601 [main] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Obtained JDBC connection
11:46:43.601 [main] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - initial autocommit status: true
11:46:43.601 [main] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - disabling autocommit
11:46:43.601 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Exposing JPA transaction as JDBC transaction [org.springframework.orm.jpa.vendor.HibernateJpaDialect$HibernateConnectionHandle@388623ad]
11:46:43.601 [main] DEBUG org.springframework.data.repository.core.support.TransactionalRepositoryProxyPostProcessor$CustomAnnotationTransactionAttributeSource - Adding transactional method 'save' with attribute: PROPAGATION_REQUIRED,ISOLATION_DEFAULT; ''
11:46:43.602 [main] DEBUG org.springframework.beans.factory.support.DefaultListableBeanFactory - Returning cached instance of singleton bean 'transactionManager'
11:46:43.602 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Found thread-bound EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@67b355c8] for JPA transaction
11:46:43.602 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Participating in existing transaction
11:46:43.606 [main] DEBUG org.hibernate.SQL - select KeyValue from SurrogateKeys where TableName = 'Departments' for update
11:46:43.608 [main] DEBUG org.hibernate.SQL - insert into SurrogateKeys(TableName, KeyValue) values('Departments', ?)
11:46:43.610 [main] DEBUG org.hibernate.SQL - update SurrogateKeys set KeyValue = ? where KeyValue = ? and TableName = 'Departments'
11:46:43.612 [main] DEBUG org.hibernate.SQL - select KeyValue from SurrogateKeys where TableName = 'Departments' for update
11:46:43.612 [main] DEBUG org.hibernate.SQL - update SurrogateKeys set KeyValue = ? where KeyValue = ? and TableName = 'Departments'
11:46:43.613 [main] DEBUG org.hibernate.event.internal.AbstractSaveEventListener - Generated identifier: 1, using strategy: org.hibernate.id.MultipleHiLoPerTableGenerator
11:46:43.613 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Initiating transaction commit
11:46:43.613 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Committing JPA transaction on EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@67b355c8]
11:46:43.613 [main] DEBUG org.hibernate.engine.transaction.spi.AbstractTransactionImpl - committing
11:46:43.613 [main] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Processing flush-time cascades
11:46:43.614 [main] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Dirty checking collections
11:46:43.614 [main] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Flushed: 1 insertions, 0 updates, 0 deletions to 1 objects
11:46:43.614 [main] DEBUG org.hibernate.event.internal.AbstractFlushingEventListener - Flushed: 0 (re)creations, 0 updates, 0 removals to 0 collections
11:46:43.614 [main] DEBUG org.hibernate.internal.util.EntityPrinter - Listing entities:
11:46:43.614 [main] DEBUG org.hibernate.internal.util.EntityPrinter - edu.ucdavis.dss.dw.entities.Department{courses=null, code=null, name=null, id=1}
11:46:43.620 [main] DEBUG org.hibernate.validator.resourceloading.PlatformResourceBundleLocator - ValidationMessages not found.
11:46:43.624 [main] DEBUG org.hibernate.validator.resourceloading.PlatformResourceBundleLocator - org.hibernate.validator.ValidationMessages found.
11:46:43.637 [main] DEBUG org.hibernate.engine.transaction.spi.AbstractTransactionImpl - rolling back
11:46:43.638 [main] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - rolled JDBC Connection
11:46:43.638 [main] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - re-enabling autocommit
11:46:43.639 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Closing JPA EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@67b355c8] after transaction
11:46:43.640 [main] DEBUG org.springframework.orm.jpa.EntityManagerFactoryUtils - Closing JPA EntityManager
11:46:43.648 [main] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Releasing JDBC connection
11:46:43.649 [main] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Released JDBC connection
11:46:43.649 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Resuming suspended transaction after completion of inner transaction
11:46:43.651 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Initiating transaction rollback
11:46:43.651 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Rolling back JPA transaction on EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@3a90c13c]
11:46:43.651 [main] DEBUG org.hibernate.engine.transaction.spi.AbstractTransactionImpl - rolling back
11:46:43.651 [main] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - rolled JDBC Connection
11:46:43.651 [main] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - re-enabling autocommit
11:46:43.652 [main] DEBUG org.springframework.orm.jpa.JpaTransactionManager - Closing JPA EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@3a90c13c] after transaction
11:46:43.652 [main] DEBUG org.springframework.orm.jpa.EntityManagerFactoryUtils - Closing JPA EntityManager
11:46:43.652 [main] DEBUG org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl - HHH000420: Closing un-released batch
11:46:43.652 [main] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Releasing JDBC connection
11:46:43.653 [main] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Released JDBC connection
11:46:43.655 [main] DEBUG com.github.springtestdbunit.DbUnitTestExecutionListener - Skipping @DatabaseTest expectation due to test exception class org.springframework.transaction.TransactionSystemException
11:46:43.656 [main] DEBUG org.dbunit.database.DatabaseDataSourceConnection - close() - start
11:46:43.657 [main] DEBUG org.springframework.test.context.support.DirtiesContextTestExecutionListener - After test method: context [DefaultTestContext@1da2cb77 testClass = BannerManagerTestCase, testInstance = edu.ucdavis.dss.dw.site.BannerManagerTestCase@48f278eb, testMethod = testCatchesNullDepartment@BannerManagerTestCase, testException = org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction, mergedContextConfiguration = [MergedContextConfiguration@2f217633 testClass = BannerManagerTestCase, locations = '{}', classes = '{class edu.ucdavis.dss.dw.config.TestContextConfiguration}', contextInitializerClasses = '[]', activeProfiles = '{}', contextLoader = 'org.springframework.test.context.support.DelegatingSmartContextLoader', parent = [null]]], class dirties context [false], class mode [null], method dirties context [false].
11:46:43.675 [main] DEBUG org.springframework.test.context.support.DirtiesContextTestExecutionListener - After test class: context [DefaultTestContext@1da2cb77 testClass = BannerManagerTestCase, testInstance = [null], testMethod = [null], testException = [null], mergedContextConfiguration = [MergedContextConfiguration@2f217633 testClass = BannerManagerTestCase, locations = '{}', classes = '{class edu.ucdavis.dss.dw.config.TestContextConfiguration}', contextInitializerClasses = '[]', activeProfiles = '{}', contextLoader = 'org.springframework.test.context.support.DelegatingSmartContextLoader', parent = [null]]], dirtiesContext [false].
Tests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 7.299 sec <<< FAILURE!

Results :

Tests in error: 
  testCatchesNullDepartment(edu.ucdavis.dss.dw.site.BannerManagerTestCase): Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction

如果我不确定我的阅读是否正确——我看到空值部门实体，然后看到它正在回滚的信息，但人们会认为它会在某处表明它决定回滚的原因.

Answer 1

您可以在新事务中运行有问题的方法。你应该使用Propagation.REQUIRES_NEW，而不是@Transactional(propagation = Propagation.NOT_SUPPORTED)：

@Transactional(propagation = Propagation.REQUIRES_NEW)

强制创建新事务。 NOT_SUPPORTED 不会导致创建新事务，它只会暂停当前事务。

将对方法的调用包装在 try/catch 块中。我不确定您在春季环境中会遇到什么异常。在 Java EE 中，它将是 EJBException。