hibernate的报错问题谢谢

报错:
java.lang.NoClassDefFoundError: org/dom4j/DocumentException
 myweb.DataBase.<init>(DataBase.java:16)
 myweb.AdminLoginAction.execute(AdminLoginAction.java:23)
 org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421)
 org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:226)
 org.apache.struts.action.ActionServlet.process(ActionServlet.java:1164)
 org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:415)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
 javax.servlet.http.HttpServlet.service(HttpServlet.java:802)网上说是可能XML文件部队等错误导致,但是我实在看不出来哪部队....请各位帮忙解决下谢谢XML文件内容贴上<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-configuration>
<session-factory name="java:/hibernate/HibernateFactory">
<property name="hibernate.show_sql">true</property>
<property name="hibernate.dialect">org.sf.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/myweb</property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">1984320</property>
    <property name="hibernate.transaction.factory_class">net.sf.hibernate.transaction.JDBCTransactionFactory</property>
    <mapping resource="myweb/UserBean.hbm.xml"/>
</session-factory>
</hibernate-configuration>
另外的一种写法也试过也是报一样的错误
<?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="java:/hibernate/HibernateFactory">
    <property name="show_sql">true</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="connection.url">jdbc:mysql://localhost:3306/myweb</property>
    <property name="connection.username">root</property>
    <property name="connection.password">1984320</property>
    <mapping resource="myweb/UserBean.hbm.xml"/>
    </session-factory>
</hibernate-configuration>另外XML文件路径放在CLASS里面应该没有问题的...