无法得到SessionFactory

我参照网上文章，做了如下配置，看起来正常，但就是无法得到SessionFactory。请高手过目，指点迷津：

1、在WebLogic的启动命令中将Hibernate有关的jar包全部加到CLASSPATH中

2、写一个启动类如下：
package util;

import weblogic.common.T3ServicesDef;
import weblogic.common.T3StartupDef;

import java.util.Hashtable;

import org.hibernate.cfg.Configuration;

public class HibernateStartup implements T3StartupDef {

    public String startup(String string, Hashtable hashtable) throws Exception {
        Configuration conf = new Configuration().configure();
        conf.buildSessionFactory();
        return "SessionFactory init complete and bound to JNDI successful";
    }

    public void setServices(T3ServicesDef t3ServicesDef) {
    }
}


3、写一个hibernate.cfg.xml如下：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory name="jndi.mysource">
<property name="connection.datasource">jndi/mhwzlocal</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="jndi.class">weblogic.jndi.WLInitialContextFactory</property>
<property name="jndi.url">t3://127.0.0.1:8081</property>
</session-factory>
</hibernate-configuration>

4、将上面的两个文件编译后打包jndi-init.jar，也放入WebLogic的启动命令中的CLASSPATH。包中结构如下：
+ jndi-init.jar
      - hibernate.cfg.xml
      + util
            - HibernateStartup.class


5、启动WebLogic，配置好数据源jndi/mhwzlocal，加入Startup Class。

6、重新启动WebLogic，Hibernate初始化完毕，没有出错，但有一句警告：
2006-6-30 10:51:26 org.hibernate.impl.SessionFactoryObjectFactory addInstance
警告: InitialContext did not implement EventContext

7、检查JNDI Tree，jndi/mysource已经绑定了，这是WebLogic中查到的该JNDI的信息：
Bind Name: mysource
Object Class: org.hibernate.impl.SessionFactoryImpl
Object Hash Code: 34701006
Object To String: org.hibernate.impl.SessionFactoryImpl@2117ece

8、我并不清楚Hibernate调用该JNDI的时候配置文件该怎么写。我是这样写的：
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="jndi.class">weblogic.jndi.WLInitialContextFactory</property>
<property name="jndi.url">t3://127.0.0.1:8081</property>

<mapping resource="pojos/person.hbm.xml"/>
</session-factory>
</hibernate-configuration>


9、我试图通过查找JNDI获得SessionFactory，我的HibernateUtil是这样写的：
public class HibernateUtil {

private static SessionFactory sessionFactory = null;

    static {
        try {
            Properties p = new Properties();
            p.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
            p.put(Context.PROVIDER_URL, "t3://127.0.0.1:8081");
   
            Context ctx = new InitialContext(p);
            sessionFactory = (SessionFactory) ctx.lookup("jndi/mysource");
        } catch (Throwable ex) {
            ex.printStackTrace();
        }
     }

    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }

}


10、运行结果是找不到SessionFactory，程序输出如下：
0 [main] DEBUG org.hibernate.impl.SessionFactoryObjectFactory - initializing class SessionFactoryObjectFactory
0 [main] DEBUG org.hibernate.impl.SessionFactoryObjectFactory - JNDI lookup: jndi/mysource
0 [main] DEBUG org.hibernate.impl.SessionFactoryObjectFactory - lookup: uid=4a45a8b20c22d912010c22d913490000
15 [main] WARN org.hibernate.impl.SessionFactoryObjectFactory - Not found: 4a45a8b20c22d912010c22d913490000
15 [main] DEBUG org.hibernate.impl.SessionFactoryObjectFactory - {}



望高手指点迷津，不胜感激！