我有一个在 Tomcat 6 上运行的 servlet,它使用 Hibernate 4.1.6 和 c3p0 0.9.1.2,我收到了太多的 org.hibernate.ResourceClosedException,并显示消息“此 TransactionCoordinator 已关闭”。
在线程被另一个调用重用之前,我已经检查过beginTransaction()
并且rollback()
或已完成。commit()
在 hibernate.cfg.xml,我有
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.password">password</property>
<property name="hibernate.connection.url">jdbc:mysql://host/database</property>
<property name="hibernate.connection.username">username</property>
<property name="hibernate.connection.zeroDateTimeBehavior">convertToNull</property>
<property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
<property name="show_sql">true</property>
<property name="current_session_context_class">thread</property>
<property name="hibernate.c3p0.min_size">5</property>
<property name="hibernate.c3p0.max_size">20</property>
<property name="hibernate.c3p0.timeout">1800</property>
<property name="hibernate.c3p0.max_statements">50</property>
<!-- mappings start here -->
...
</session-factory>
</hibernate-configuration>
我正在使用 HibernateUtil.java 为我的应用程序创建一个静态 sessionFactory 并使用它来控制我的事务:
public class HibernateUtil {
private static final SessionFactory sessionFactory = buildSessionFactory();
private static SessionFactory buildSessionFactory() {
try {
Configuration configuration = new Configuration();
configuration.configure();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
SessionFactory sessionFactory = configuration.buildSessionFactory(serviceRegistry);
return sessionFactory;
}
catch (Throwable ex) {
throw new ExceptionInInitializerError(ex);
}
}
public static SessionFactory getSessionFactory() {
return sessionFactory;
}
public static void shutdown() {
getSessionFactory().close();
}
public static void beginTransaction() {
HibernateUtil.getSessionFactory().getCurrentSession().beginTransaction();
}
public static void commit() {
HibernateUtil.getSessionFactory().getCurrentSession().getTransaction().commit();
}
public static void rollback() {
HibernateUtil.getSessionFactory().getCurrentSession().getTransaction().rollback();
}
}
当我开始在 servlet 中使用数据库时,我的代码基本上是这样的:
try {
HibernateUtil.beginTransaction();
// do stuffs
HibernateUtil.commit();
} catch (RuntimeException e) {
HibernateUtil.rollback();
throw e;
} catch (Exception e) {
HibernateUtil.rollback();
throw e;
}
我在哪里做错了?