我试图将hibernate实体管理器与mysql和glassfish一起使用。尝试使用JTA数据源时出现以下错误:
Caused by: org.hibernate.HibernateException: The chosen transaction strategy requires access to the JTA TransactionManager at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:376) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1367) at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:858) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:733) ... 37 more
这是我配置persistence.xml的方法
<?xml version="1.0" encoding="UTF-8"?> <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> <persistence-unit name="myPU" transaction-type="JTA"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <jta-data-source>jdbc/mysql</jta-data-source> <class>com.my.shared.entity.MyFile</class> <class>com.my.shared.entity.MyRole</class> <class>com.my.shared.entity.MyUser</class> <exclude-unlisted-classes>true</exclude-unlisted-classes> <properties> <property name="hibernate.hbm2ddl.auto" value="create-drop"/> <property name="hibernate.show.sql" value="true" /> </properties>
但是,当我配置非jta数据源时,它可以正常工作
<?xml version="1.0" encoding="UTF-8"?> <persistence version="1.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"> <persistence-unit name="myPU" transaction-type="JTA"> <provider>org.hibernate.ejb.HibernatePersistence</provider> <non-jta-data-source>jdbc/mysql</non-jta-data-source> <class>com.my.shared.entity.MyFile</class> <class>com.my.shared.entity.MyRole</class> <class>com.my.shared.entity.MyUser</class> <exclude-unlisted-classes>true</exclude-unlisted-classes> <properties> <property name="hibernate.hbm2ddl.auto" value="create-drop"/> <property name="hibernate.show.sql" value="true" /> </properties> </persistence-unit> </persistence>
很好,但是我真的很想使用:
em.persist(myObject);
代替:
em.getTransaction().begin(); em.persist(myObject); em.getTransaction().commit();
我是否在hibernate配置中缺少某些东西,或者甚至可以使用JTA数据源?
在您的配置中,默认情况下使用容器管理的事务。在这种情况下,您需要定义一种事务同步方式,以便通知持久层(例如,可以更新第二级缓存)。因此,您需要manager_lookup_class按以下方式定义属性:
manager_lookup_class
// For GlassFish: hibernate.transaction.manager_lookup_class=org.hibernate.transaction.SunONETransactionManagerLookup // For WebSpere: hibernate.transaction.manager_lookup_class=org.hibernate.transaction.WebSphereExtendedJTATransactionLookup // For JBoss: hibernate.transaction.manager_lookup_class=org.hibernate.transaction.JBossTransactionManagerLookup // For OpenEJB: hibernate.transaction.manager_lookup_class=org.apache.openejb.hibernate.TransactionManagerLookup
另外,您还必须将访问数据层的业务方法标记为“事务性”。为此,您需要标记它们@javax.ejb.TransactionAttribute(REQUIRED)(有关此注释的更多信息,请参见此处)。
@javax.ejb.TransactionAttribute(REQUIRED)
您还可以选择切换到Bean管理的事务。您可以这样说:
hibernate.transaction.factory_class=org.hibernate.transaction.JTATransactionFactory
然后,bean负责开始/结束事务:
org.hibernate.Session session = ...; org.hibernate.Transaction tx = null; try { tx = session.beginTransaction(); session.createQuery(...); // do some staff tx.commit(); } catch (HibernateException e) { if (tx != null) { tx.rollback(); } }