spring,hibernate配置proxool的问题

Question

applicationContext.xml中配置如下：
<prop key="hibernate.dialect">net.sf.hibernate.dialect.Oracle9Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.cglib.use_reflection_optimizer">true</prop>
<prop key="hibernate.proxool.xml">proxool.xml</prop>
<prop key="hibernate.proxool.pool_alias">testspring</prop>
proxool.xml如下：
  <proxool>
    <alias>testspring</alias>
    <driver-url>jdbc:oracle:thin:@192.168.0.100:1521:test</driver-url>
    <driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
    <driver-properties>
      <property name="user" value="test"/>
      <property name="password" value="test"/>
    </driver-properties>
    <house-keeping-sleep-time>90000</house-keeping-sleep-time>
    <proxool.simultaneous-build-throttle>100</proxool.simultaneous-build-throttle>
    <prototype-count>10</prototype-count>
    <maximum-connection-count>100</maximum-connection-count>
    <minimum-connection-count>10</minimum-connection-count>
  </proxool>但是web.xml当加载时总是提示：
Configuring Proxool Provider using JAXPConfigurator: proxool.xml
[FATAL] 2007-01-11 20:57:58,100 method:net.sf.hibernate.connection.ProxoolConnectionProvider.configure(ProxoolConnectionProvider.java:126)
Proxool Provider unable to load JAXP configurator file: proxool.xml
org.logicalcobwebs.proxool.ProxoolException: Parsing failed.
为什么不能读取并解析proxool.xml呢？