切换到JPA，现在我总是在任何插入上得到TransactionRequiredException

时间：2014-09-24 06:13:14

标签： java spring hibernate jpa transactions

我有一个Spring4 Web应用程序。最初我使用的是Hibernate SessionFactory，并使用Spring Hibernate API进行开发。一切都很好。愚蠢的是，我最近决定转而使用JPA，Hibernate仍然是我的提供者。我重新配置了我的Spring设置并重写了我的大部分代码。最初经过测试，以便我的所有数据库读取都能正常工作。然后我尝试了数据库写入，它们都像这样失败：

javax.persistence.TransactionRequiredException: no transaction is in progress
    at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:970)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.springframework.orm.jpa.ExtendedEntityManagerCreator$ExtendedEntityManagerInvocationHandler.invoke(ExtendedEntityManagerCreator.java:342)
    at com.sun.proxy.$Proxy47.flush(Unknown Source)
    at com.taubler.oversite.dao.impl.EntityDaoImpl.insert(EntityDaoImpl.java:65)
    ...

请注意，在使用HibernateTemplate，SessionFactory，HibernateTransactionManager等时，我的代码运行正常。我的业务逻辑类以及我的DAO都使用{{1注释就像以前一样。

看起来Hibernate正在尝试创建一个事务，因为我在堆栈跟踪之前的日志中看到以下内容：

@Transactional

这是一些相关的代码。首先，我的spring配置XML片段：

2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - initial autocommit status: true
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - disabling autocommit
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.internal.SessionImpl - Opened session at timestamp: 14115372286
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.internal.SessionImpl - Setting flush mode to: AUTO
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.internal.SessionImpl - Setting cache mode to: NORMAL
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.event.internal.AbstractSaveEventListener - Transient instance of: com.taubler.oversite.entities.EmailAddress
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.event.internal.DefaultPersistEventListener - Saving transient instance
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.event.internal.AbstractSaveEventListener - Saving [com.taubler.oversite.entities.EmailAddress#<null>]
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.engine.spi.IdentifierValue - ID unsaved-value: null
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.event.internal.AbstractSaveEventListener - Delaying identity-insert due to no transaction in progress
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.internal.SessionImpl - Opened session at timestamp: 14115372287
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.internal.SessionImpl - Setting flush mode to: AUTO
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.internal.SessionImpl - Setting cache mode to: NORMAL
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.transaction.spi.AbstractTransactionImpl - rolling back
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - rolled JDBC Connection
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.transaction.internal.jdbc.JdbcTransaction - re-enabling autocommit
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.engine.transaction.internal.TransactionCoordinatorImpl - after transaction completion
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.internal.SessionImpl - after transaction completion
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.internal.SessionImpl - Closing session
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Closing logical connection
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.engine.jdbc.internal.JdbcResourceRegistryImpl - Closing JDBC container [org.hibernate.engine.jdbc.internal.JdbcResourceRegistryImpl@2c4e3947]
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Releasing JDBC connection
2014-09-24 05:40:28 [http-bio-8080-exec-3] DEBUG org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Released JDBC connection
2014-09-24 05:40:28 [http-bio-8080-exec-3] TRACE org.hibernate.engine.jdbc.internal.LogicalConnectionImpl - Logical connection closed

示例业务逻辑（经理）类。这个类是<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="packagesToScan" value="com.taubler.oversite.entities" /> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" /> </property> <property name="jpaProperties"> <props> <prop key="hibernate.hbm2ddl.auto">update</prop> <prop key="hibernate.dialect">org.hibernate.dialect.MySQLInnoDBDialect</prop> <prop key="hibernate.show_sql">true</prop> <prop key="hibernate.jdbc.batch_size">20</prop> <prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop> </props> </property> </bean> <bean id="txManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <tx:annotation-driven transaction-manager="txManager"/> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="${db.driver}" /> <property name="url" value="${db.url}" /> <property name="username" value="${db.username}" /> <property name="password" value="${db.password}" /> </bean> 进入SpringMVC控制器，所以Controller正在调用代理：

@Autowired

该经理打电话给DAO：

...

@Autowired
private EmailAddressDao emailAddressDao;
...

@Override
@Transactional
public EmailAddress addEmailAddress(User user, String email) {  
    EmailAddress emailAddress = new EmailAddress(user, email);
    emailAddress.setMain(false);
    emailAddress.setValidated(false);
    emailAddressDao.insert(emailAddress);
    this.initiateEmailValidation(emailAddress);
    return emailAddress;
}

我尝试过不同的变体。最初，DAO和Manager方法都使用... @PersistenceUnit private EntityManagerFactory entityManagerFactory; protected final EntityManager getEntityManager() { return entityManagerFactory.createEntityManager(); } public boolean insert(Entity o) { o.setCreated(new Date()); this.getEntityManager().persist(o); this.getEntityManager().flush(); return true; } 进行了注释，这就是纯Hibernate的工作原理。我尝试删除传播设置，仅注释Manager方法，仅注释DAO方法......没有任何作用。

有什么想法？ @Transactional(propagation=REQUIRED);和HibernateTransactionManager之间似乎有根本的不同。

2 个答案:

答案 0 :(得分：4)

@PersistenceUnit
private EntityManagerFactory entityManagerFactory;

protected final EntityManager getEntityManager() {
    return entityManagerFactory.createEntityManager();
}

问题是你自己创建了一个实体管理器，不是。只需注入EntityManager而不是EntityManagerFactory并使用@PersistenceContext注释而不是@PersistenceUnit。 Spring将负责使其成为当前事务的约束。 

@PersistenceContext
private EntityManager entityManager;

protected final EntityManager getEntityManager() {
    return entityManger;
}

如果您真的想继续注入EntityManagerFactory，请使用getTransactionalEntityManager的{​​{1}}方法来获取Spring托管EntityManagerFactoryUtils实例。

EntityManager

此外，它与“普通”休眠一起使用并不意味着您的设置必须正确。你提到你使用的protected final EntityManager getEntityManager() { return EntityManagerFactoryUtils.getTransactionalEntityManager(entityManagerFactory); } 基本上可以在没有正确的交易设置的情况下工作，因为它会为手头的动作开始新的转换。所以它很可能是应用程序似乎在它实际上没有正确的地方工作。也许你有多个交易，你预期一个（从服务层）。

另一个注意事项是你的代码可能很危险

HibernateTemplate

在您的情况下，这可能会导致创建2个不同的public boolean insert(Entity o) { o.setCreated(new Date()); this.getEntityManager().persist(o); this.getEntityManager().flush(); return true; } ，因此您可能会在持久存储时刷新另一个。接下来，您不应该将EntityManager称为flush这将由交易结束完成。

答案 1 :(得分：2)

您需要使用EntityManager注释直接注入@PersistenceContext，而不是PersistenceUnit

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