SSH配置MYSQL数据池的错误，哪位大侠能帮忙？谢谢啦

架构：SSH ，MYECLIPSE9.0 , TOMCAT6.0 , MYSQL5.0

说明：mysql数据库服务是开启的，用户名，密码，URL，驱动都正确，驱动JAR包分别都放在TOMCAT和项目的LIB目录里了。

此项目是根据“李兴华老师的《我的智囊团J2EE项目实训视频》”来做的，一步一步都是跟着他做，可是他成功了，而我却出现了以下的错误，查了几天的互联网都没有得到答案，谢谢啦。

异常如下：
org.hibernate.exception.GenericJDBCException: Cannot open connection

struts-config.xml

  <controller processorClass="org.springframework.web.struts.DelegatingRequestProcessor"></controller>

  <message-resources parameter="com.pyh.iask.struts.ApplicationResources" />

  <plug-in className="org.springframework.web.struts.ContextLoaderPlugIn">

    <set-property property="contextConfigLocation" value="/WEB-INF/classes/applicationContext.xml" />

  </plug-in>

项目WEBROOT下的web.xml

     <resource-ref>

        <description>DB Connection</description>

        <res-ref-name>jdbc/iask</res-ref-name>

        <res-type>javax.sql.DataSource</res-type>

        <res-auth>Container</res-auth>

    </resource-ref> 

  <context-param>

  	<param-name>contextConfigLocation</param-name>

  	<param-value>/WEB-INF/classses/applicationContext.xml</param-value>

  </context-param>

  <servlet>

  	<servlet-name>context</servlet-name>

  	<servlet-class>org.springframework.web.context.ContextLoaderServlet</servlet-class>

  	<load-on-startup>1</load-on-startup>

  </servlet>

applicationContext.xml

<bean id="dataSource"

		class="org.springframework.jndi.JndiObjectFactoryBean">

		<property name="jndiName" value="java:comp/env/jdbc/iask"></property>

	</bean>

	<bean id="sessionFactory"

		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

		<property name="dataSource">

			<ref bean="dataSource" />

		</property>

		<property name="hibernateProperties">

			<props>

				<prop key="hibernate.dialect">

					org.hibernate.dialect.MySQLDialect

				</prop>

				<prop key="hibernate.connection.autocommit">true</prop>

				<prop key="hibernate.show_sql">true</prop>

			</props>

		</property>

		<property name="mappingResources">

			<list>

				<value>com/pyh/iask/pojo/User.hbm.xml</value></list>

		</property></bean>

	<bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate">

		<property name="sessionFactory">

			<ref bean="sessionFactory"/>

		</property>

	</bean>

	<bean id="iuserdao" class="com.pyh.iask.dao.IUserDAO" abstract="true"></bean>

	<bean id="userdaoimpl" class="com.pyh.iask.dao.impl.UserDAOImpl" parent="iuserdao">

		<property name="hibernateTemplate">

			<ref bean="hibernateTemplate"/>

		</property>

	</bean>

	<bean name="/jsp/user" class="com.pyh.iask.struts.action.UserAction">

		<property name="iuserdao">

			<ref bean="userdaoimpl"/>

		</property>

	</bean>

TOMCAT服务器里的server.xml

<Context path="/iaskdemo" docBase="C:\Documents and Settings\Administrator\Workspaces\MyEclipse 9\IaskDemo\WebRoot"

				debug="5" reloadable="true" crossContext="true">

		 

			 <Logger className="org.apache.catalina.logger.FileLogger"

						 prefix="localhost_MysqlTest_log." suffix=".txt"

						 timestamp="true"/>

						 

			<Resource name="jdbc/iask"  auth="Container" type="javax.sql.DataSource"/>

			

			<ResourceParams name="jdbc/iask">

				<parameter>

					<name>factory</name>

					<value>org.apache.commons.dbcp.BasicDataSourceFactory</value>

				</parameter>

				<parameter>

					<name>maxActive</name>

					<value>100</value>

				</parameter>

				<parameter>

					<name>maxIdle</name>

					<value>30</value>

				</parameter>

				<parameter>

					<name>maxWait</name>

					<value>5000</value>

				</parameter>

				<parameter>

					<name>username</name>

					<value>root</value>

				</parameter>

				<parameter>

					<name>password</name>

					<value>mysqladmin</value>

				</parameter>

				<parameter>

					<name>driverClassName</name>

					<value>org.gjt.mm.mysql.Driver</value>

				</parameter>

				<parameter>

					<name>url</name>

					<value>jdbc:mysql://localhost:3306/iask</value>

				</parameter>

			  </ResourceParams>

		</Context>

UserAction

package com.pyh.iask.struts.action;



import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;



import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.actions.DispatchAction;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;



import com.pyh.iask.dao.IUserDAO;

import com.pyh.iask.struts.form.UserForm;

import com.pyh.iask.util.IPTime;

public class UserAction extends DispatchAction {

	private IUserDAO iuserdao ;

	public ActionForward register(ActionMapping mapping, ActionForm form,

			HttpServletRequest request, HttpServletResponse response) {

		UserForm userForm = (UserForm) form;// TODO Auto-generated method stub

		if (userForm.getPhoto() == null

				|| userForm.getPhoto().getFileSize() == 0) {

			userForm.getUser().setPhoto("nophoto.jpeg");

		} else {

			userForm.getUser().setPhoto(

					new IPTime(request.getRemoteAddr()).getIPTime()

							+ userForm

									.getPhoto()

									.getFileName()

									.substring(

											userForm.getPhoto().getFileName()

													.lastIndexOf(".")));

		}

		try{

			this.iuserdao.doRegister(userForm.getUser()) ;

			request.getSession().setAttribute("userid", userForm.getUser().getUserid()) ;

			request.getSession().setAttribute("grade", userForm.getUser().getGrade()) ;

			return mapping.findForward("registersuccess") ;

		}catch(Exception e){

			e.printStackTrace() ;

			request.setAttribute("reg", e) ;

			return mapping.getInputForward() ;

		}

	}



        public IUserDAO getIuserdao() {

		return iuserdao;

	}



	public void setIuserdao(IUserDAO iuserdao) {

		this.iuserdao = iuserdao;

	}

}