请高手帮忙，小弟感激不尽，弄了很长时间都没弄出来，谢谢

我用swing+hibernate+Oracle做的公司员工管理系统
这是hibernate配置文件：
<?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="connection.driver_class"><!-- 配置数据库的驱动类 -->
oracle.jdbc.driver.OracleDriver
</property>
<property name="connection.url"><!-- 配置数据库的连接路径 -->
jdbc:oracle:thin:@127.0.0.1:1521:DBSQL
</property>
<property name="connection.username">PERSONNEL_MANAGE</property><!-- 配置数据库的连接用户名 -->
<property name="connection.password">MWQ</property><!-- 配置数据库的连接密码，这里密码为空，在这种情况下也可以省略该行配置代码 -->
<property name="dialect"><!-- 配置数据库使用的方言 -->
org.hibernate.dialect.OracleDialect
</property>
<property name="show_sql">true</property><!-- 配置在控制台显示SQL语句 -->
<property name="format_sql">true</property><!-- 配置对输出的SQL语句进行格式化 -->
<property name="use_sql_comments">true</property><!-- 配置在输出的SQL语句前面添加提示信息 --> <mapping resource="com/mwq/hibernate/mapping/TbDept.hbm.xml" /><!-- 配置持久化类映射文件 -->
<mapping
resource="com/mwq/hibernate/mapping/TbPersonalInfo.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbNativePlace.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbBringUpContent.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbReckoningList.hbm.xml" />
<mapping resource="com/mwq/hibernate/mapping/TbManager.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbRewardsAndPunishment.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbAccountItem.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbDutyInfo.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbReckoning.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbTimecard.hbm.xml" />
<mapping resource="com/mwq/hibernate/mapping/TbNation.hbm.xml" />
<mapping resource="com/mwq/hibernate/mapping/TbRecord.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbReckoningInfo.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbAccessionForm.hbm.xml" />
<mapping resource="com/mwq/hibernate/mapping/TbDuty.hbm.xml" />
<mapping
resource="com/mwq/hibernate/mapping/TbBringUpOntent.hbm.xml" /> </session-factory></hibernate-configuration>错误提示：
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "AWT-EventQueue-0" java.lang.ExceptionInInitializerError
at org.hibernate.cfg.Configuration.reset(Configuration.java:168)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:187)
at org.hibernate.cfg.Configuration.<init>(Configuration.java:191)
at com.mwq.hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:16)
at com.mwq.hibernate.BaseDao.queryList(BaseDao.java:29)
at com.mwq.hibernate.Dao.queryManagerOfNatural(Dao.java:141)
at com.mwq.frame.LandFrame.<init>(LandFrame.java:100)
at com.mwq.PersonnelManage.land(PersonnelManage.java:32)
at com.mwq.PersonnelManage$1.run(PersonnelManage.java:26)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at org.hibernate.util.ConfigHelper.getResourceAsStream(ConfigHelper.java:144)
at org.hibernate.cfg.Environment.<clinit>(Environment.java:529)
... 17 more
不知道哪里错了，请帮忙看看，谢谢