研究连接池的时候，报错，请各位兄弟们指点指点。。。

Question

server.xml
-------------------------------------
      <Host name="localhost" debug="0" appBase="webapps" unpackWARs="true"><Context path="/" docBase="E:\Tomcat\webapps" debug="0" reloadable="true" crossContext="true">
   <Logger className="org.apache.catalina.logger.FileLogger" 
     prefix="online_log." suffix=".txt" timestamp="true"/>
   <Resource name="jdbc/sqlsvr2k" auth="Container" type="javax.sql.DataSource"/>  
   <ResourceParams name="jdbc/sqlsvr2k">
    <parameter>
     <name>factory</name>
     <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>
    <parameter>
     <name>driverClassName</name>
     <value>com.microsoft.jdbc.sqlserver.SQLServerDriver</value>
    </parameter>
    <parameter>
     <name>url</name>
     <value>jdbc:microsoft:sqlserver://127.0.0.1:1433;DatabaseName=classdb</value>
    </parameter>
    <parameter>
     <name>username</name>
     <value>test</value>
    </parameter>
    <parameter>
     <name>password</name>
     <value>testtest</value>
    </parameter>
       <parameter>
     <name>maxActive</name>
          <value>50</value>
       </parameter>
       <parameter>
        <name>maxIdle</name>
          <value>5</value>
       </parameter>
       <parameter>
        <name>maxWait</name>
         <value>-1</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>
      </Host>
-------------------------------------web.xml配置
-------------------------------------<resource-ref>
<description>connectDB test</description>
<res-ref-name>jdbc/sqlsvr2k</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
-------------------------------------
test.jspep
-------------------------------

Answer 1

test.jsp
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<%@page contentType="text/html; charset=GBK"%>
<%@page import="java.sql.*"%>
<%//@page import="java.util.*"%>
<%@page import="javax.naming.*"%>
<%//@page import="javax.servlet.http.*"%>
<%//@page import="javax.servlet.*"%>
<%@page import="javax.sql.*"%>
<%//@page import="gb.*"%><%
   Context ctx=null;
   Connection cnn=null;
   Statement stmt=null;
   ResultSet rs=null;
   try
   {
    ctx=new InitialContext();
    if(ctx==null)
     throw new Exception("没有匹配的环境");
    DataSource ds=(DataSource)ctx.lookup("java:comp/env/jdbc/sqlsvr2k");
   /* 
     if(ds==null)
     throw new Exception("没有匹配数据库");
    
    cnn=ds.getConnection();
    stmt=cnn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY);
    rs=stmt.executeQuery("select * from admin");

   //读取数据库
   if(rs.next()){
      out.println(rs.getString("name"));
   }
   */
   }   finally
   {
    if(rs!=null)
     rs.close();
    if(stmt!=null)
     stmt.close();
    if(cnn!=null)
     cnn.close();
    if(ctx!=null)
     ctx.close();
   }
%>
-------------------------------