关于jsp连接MYSQL数据库连接池的使用

请教关于JSP连接MYSQL数据库连接池的配置以及使用方法，本人从书上配置好后，但是在编译时总是找不到类包，虽然我已经在SERVER.xml和WEB。XML下已经配置完，但是具体什么意思也不清楚，书上没有具体说明配置的详细意思，现在请教各位，将本人配置也写在下面
    MYSQL 的数据库名为lianxi 用户名ROOT密码111,在tomcat的ROOT下新建了一个目录panligang
  SERVER.xml添加配置如下
 <Context path="/panligang" docBase="panligang" debug="5" reloadable="true" crossContext="true">  
<Logger className="org.apache.catalina.logger.FileLogger" prefix="localhost_DBTest_log." suffix=".txt" timestamp="true"/>
           <Resource name="jdbc/mysql/lianxi" auth="Container" type="javax.sql.DataSource"/> 
           <ResourceParams name="jdbc/lianxi">   
                   <parameter>
                               <name>factory</name>   
                               <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>   
                   </parameter>                                   <!-- Class name for mm.mysql JDBC driver -->  
                   <parameter>    
                                <name>driverClassName</name>      
                                <value>com.mysql.jdbc.Driver</value>   
                   </parameter>                                 <!-- The JDBC connection url for connecting to your MySQL dB.       
                                     The autoReconnect=true argument to the url makes sure that the     
                                     mm.mysql JDBC Driver will automatically reconnect if mysqld closed 
                                     the connection.  mysqld by default closes idle connections after 8 hours.-->  
                   <parameter>  
                                <name>url</name>
                                <value>jdbc:mysql://localhost:3306/lianxi?autoReconnect=true</value>
                   </parameter>                                 <!-- MySQL dB username and password for dB connections  -->  
                   <parameter>  
                                <name>username</name>   
                                <value>root</value>   
                   </parameter>                      <parameter>   
                                <name>password</name> 
                                <value>111</value>   
                   </parameter>                                 <!-- Maximum number of dB connections in pool. Make sure you 
                                      configure your mysqld max_connections large enough to handle      
                                      all of your db connections. Set to 0 for no limit.-->
                   <parameter>    
                                <name>maxActive</name>   
                                <value>100</value>   
                   </parameter>                                   <!-- Maximum number of idle dB connections to retain in pool. 
                                      Set to 0 for no limit. -->  
                   <parameter>  
                                <name>maxIdle</name>
                                <value>30</value>
                   </parameter>                                <!-- Maximum time to wait for a dB connection to become available in ms,
                                     in this example 10 seconds. An Exception is thrown if this timeout
                                     is exceeded.  Set to -1 to wait indefinitely.-->   
                   <parameter>     
                       <name>maxWait</name>
                       <value>10000</value>  
                   </parameter> 
                   <parameter>
                    <name>removeAbandoned</name>
                    <value>true</value>
                   </parameter>
                   <parameter>
                    <name>removeAbandonedTimeout</name>
                    <value>60</value>
                   </parameter>  
                   <parameter>
                    <name>logAbandoned</name>
                    <value>true</value>
                   </parameter>
         </ResourceParams>
</Context>
在web.xml下添加了如下代码 
<resource-ref>
   <description>MySQL  Datasource  example</description>
   <res-ref-name>jdbc/mysql/lianxi</res-ref-name>
   <res-type>javax.sql.DataSource</res-type>
   <res-auth>Container</res-auth> 
</resource-ref>
 我已经下载了JDBC驱动并且放在 了JDK的LIB下，在TOMCAT的COMMAN的LIB下也同样放了驱动程序，运行别的JAVA APPLICATION 程序没有 错误，但是就是下面这个程序总出错，
package sso.common;import javax.sql.DataSource;
import java.sql.SQLException;
import javax.servlet.ServletContext;
import java.util.*;
import javax.servlet.http.*;
import sso.common.*;
import javax.naming.*;public class DBUtil {

  static String message="";

public static DataSource getPool(String dbName){
Context initCtx=null;
        Context ctx=null;
        DataSource ds=null;
       
        try{
           initCtx = new InitialContext();
          
            ctx = (Context) initCtx.lookup("java:comp/env");
                          
            ds = (DataSource) ctx.lookup(dbName);
                            
           }catch(Exception e){
             System.out.println(e.getMessage()+"找不到数据源"+dbName);
             message="找不到数据源";
             if (initCtx == null)
                return null;
          }
          
           return ds;
    }
    
    public static String getMessage(){
    
        return message;
    } 
    }
出错提示package javax.servelet.http不存在
请各位大虾指教