proxool 出现的错误~求救...

Question

proxool.xml如下：
<?xml version="1.0" encoding="UTF-8"?>
<something-else-entirely>
  <proxool>
    <alias>DBPool</alias>
    <driver-url>jdbc:oracle:thin:@127.0.0.1:1521:ORCL</driver-url>
    <driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
    <driver-properties>
      <property name="user" value="system"/>
      <property name="password" value="123456"/>
    </driver-properties>
    <house-keeping-sleep-time>45000</house-keeping-sleep-time>
    <prototype-count>3</prototype-count>
    <minimum-connection-count>3</minimum-connection-count>
    <maximum-connection-count>300</maximum-connection-count>
    <maximum-new-connections>20</maximum-new-connections>
    <trace>true</trace>
    <house-keeping-test-sql>select CURRENT_DATE</house-keeping-test-sql>
  </proxool>  
</something-else-entirely>web.xml中如下： <servlet>
     <servlet-name>proxoolServletConfigurator</servlet-name>
 <servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
     <init-param>
       <param-name>xmlFile</param-name>
       <param-value>WEB-INF/proxool.xml</param-value>
     </init-param>
     <load-on-startup>1</load-on-startup>
   </servlet>   <servlet>
    <servlet-name>AdminPro</servlet-name>
      <servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>
   </servlet>
   <servlet-mapping>
    <servlet-name>AdminPro</servlet-name>
    <url-pattern>/adminpro</url-pattern>
   </servlet-mapping> 这2个XML文件都在WEB-INF目录下；
调用就出现错误
java.sql.SQLException: org.logicalcobwebs.proxool.ProxoolException: Attempt to refer to a unregistered pool by its alias 'DBPool'
这个大概是怎么解决？