hibernate、mysql、glassfish v3 和 JTA 数据源

Question

我正在尝试将休眠实体管理器与 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的方式

<?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>

这一切都很好，但我真的很想使用：

em.persist(myObject);

代替：

em.getTransaction().begin();
em.persist(myObject);
em.getTransaction().commit();

我是否缺少休眠配置的某些内容，或者甚至可以使用 JTA 数据源？

Answer 1

您的配置似乎默认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，可以更新二级缓存）。所以你需要定义manager_lookup_class属性如下：

// 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

您还必须将访问数据层的业务方法标记为“事务性”。为此，您需要用@javax.ejb.TransactionAttribute(REQUIRED) 标记它们（有关此注释的更多信息，请参阅here）。

您还可以选择切换到 bean 管理的事务。你可以这样说：

hibernate.transaction.factory_class=org.hibernate.transaction.JTATransactionFactory

然后bean负责启动/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();
    }
}