java – 为什么我的应用程序中的每个线程都使用不同的hibernate

public class HibernateSessionFactory {
private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
private  static Configuration configuration = new AnnotationConfiguration();    
private static org.hibernate.SessionFactory sessionFactory;
static {
    try {
        configuration.configure(configFile);
        sessionFactory = configuration.buildSessionFactory();
    } catch (Exception e) {}
}
private HibernateSessionFactory() {}
public static Session getSession() throws HibernateException {
    Session session = (Session) threadLocal.get();
    if (session == null || !session.isOpen()) {
if (sessionFactory == null) {
    rebuildSessionFactory();//This method basically does what the static init block does
}
session = (sessionFactory != null) ? sessionFactory.openSession(): null;
threadLocal.set(session);
}
   return session;
}
//More non relevant methods here.

从我的测试开始,似乎threadLocal成员在JVM首次加载类时确实只初始化了一次,但由于某些原因,当不同的线程访问getSession()方法时,它们使用不同的会话.当一个线程首次访问这个类(Session)threadLocal.get();将返回null,但正如预期的那样,所有其他访问请求将会生成相同的会话.我不确定这是怎么发生的,因为threadLocal变量是final,而方法threadLocal.set(session)仅用于上面的上下文中(我99.9％肯定会有非空会话,因为我会在我的应用程序的不同部分遇到NullPointerException).

我不确定这是否相关,但这些是我的hibernate.cfg.xml文件的主要部分：

<hibernate-configuration>
<session-factory>
<property name="connection.url">someURL</property>
<property name="connection.driver_class"> com.microsoft.sqlserver.jdbc.SQLServerDriver</property>
<property name="dialect">org.hibernate.dialect.SQLServerDialect</property>

<property name="hibernate.connection.isolation">1</property> 

<property name="hibernate.connection.username">User</property>
<property name="hibernate.connection.password">Password</property>
<property name="hibernate.connection.pool_size">10</property>

<property name="show_sql">false</property>
<property name="current_session_context_class">thread</property>
<property name="hibernate.hbm2ddl.auto">update</property>

<property name="hibernate.cache.use_second_level_cache">false</property>
<property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
<!-- Mapping files -->

我很感激任何帮助,当然如果有人有任何问题我会很乐意澄清.
以太