hibernate，mysql，glassfish v3和JTA数据源 [英] hibernate, mysql, glassfish v3, and JTA datasource

问题描述

我试图在mysql和glassfish中使用hibernate实体管理器。尝试使用JTA数据源时出现以下错误：

 原因：org.hibernate.HibernateException：所选事务策略需要访问LT中的JTA TransactionManager 
。在org.hibernate.impl.SessionFactoryImpl&;在org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java（SessionFactoryImpl.java:376）
;。&INIT GT ：在org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory（Ejb3Configuration.java:733）
在org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory 1367）
（AnnotationConfiguration.java:858）
。 .. 37 more 
  

这是我如何配置我的persistence.xml

 <？xml version =1.0encoding =UTF-8？> 
< persistence version =1.0xmlns =http://java.sun.com/xml/ns/persistencexmlns：xsi =http://www.w3.org/2001/XMLSchema-实例xsi：schemaLocation =http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd\"> 
< persistence-unit name =myPUtransaction-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> 
<属性> 
< property name =hibernate.hbm2ddl.autovalue =create-drop/> 
< property name =hibernate.show.sqlvalue =true/> 
< / properties> 
  

然而，当我配置非jta数据源时，它工作正常

 <？xml version =1.0encoding =UTF- 8\" >？; 
< persistence version =1.0xmlns =http://java.sun.com/xml/ns/persistencexmlns：xsi =http://www.w3.org/2001/XMLSchema-实例xsi：schemaLocation =http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd\"> 
< persistence-unit name =myPUtransaction-type =JTA> 
< provider> org.hibernate.ejb.HibernatePersistence< / provider> 
<非-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> 
<属性> 
< property name =hibernate.hbm2ddl.autovalue =create-drop/> 
< property name =hibernate.show.sqlvalue =true/> 
< / properties> 
< / persistence-unit> 
< /余辉> 
  

这一切都很好，但我真的很想使用：

  em.persist（myObject）; 
  

而不是：

  em.getTransaction（）开头（）; 
 em.persist（myObject）; 
 em.getTransaction（）。commit（）; 
  

我是缺少与hibernate配置有关的东西，还是甚至有可能使用JTA数据源？解析方案

对于你的配置来说，容器管理的事务是默认使用的。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（并且可以更新二级缓存）。所以你需要定义 manager_lookup_class 属性，如下所示：

  //对于GlassFish：
 hibernate.transaction.manager_lookup_class属性= org.hibernate.transaction.SunONETransactionManagerLookup 
 //对于的WebSpere：
 hibernate.transaction.manager_lookup_class属性= org.hibernate.transaction.WebSphereExtendedJTATransactionLookup 
 //对于JBoss ：
 hibernate.transaction.manager_lookup_class属性= org.hibernate.transaction.JBossTransactionManagerLookup 
 //对于OpenEJB的：
 hibernate.transaction.manager_lookup_class属性= 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，您需要使用 @ javax.ejb.TransactionAttribute（REQUIRED）标记它们（请参阅 here 以获取更多关于此批注的信息）。

您也可以选择切换到Bean管理的事务。你可以这样做：

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

然后bean负责开始/结束交易：

  org .hibernate.Session session = ...; 
 org.hibernate.Transaction tx = null; 
尝试{
 tx = session.beginTransaction（）; 
 session.createQuery（...）; //做一些工作人员
 tx.commit（）; 
} catch（HibernateException e）
 {
 if（tx！= null）{
 tx.rollback（）; 
} 
} 
  

I'm attempting to use hibernate entity manager with mysql and glassfish. I'm getting the following error when attempting to use a JTA datasource:

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

Here is how I have configured my persistence.xml

<?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>

However, when I configure a non-jta datasource, it works fine

<?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>

That's all well and good, but I would really like to use:

em.persist(myObject);

instead of:

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

Am I missing something with the hibernate configuration, or is it even possible to use a JTA datasource?

解决方案

It seems like for your configuration, container-managed transactions are used by default. In this case you need to define a way of transaction synchronization so the persistence layer is notified (and can update the 2nd level cache for example). So you need to define manager_lookup_class property as following:

// 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

Also you have to mark business methods that access data layer as "transactional". For that you need to mark them with @javax.ejb.TransactionAttribute(REQUIRED) (see here for more information about this annotation).

You also have an option to switch to bean-managed transactions. You can do it by saying:

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

Then the bean is responsible for starting/ending the transaction:

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();
    }
}

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