proxool 的问题

Question

<?xml version="1.0" encoding="ISO-8859-1"?><proxool>
<alias>DBPool</alias>
<driver-url>
jdbc:mysql://localhost/forum?&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;mysqlEncoding=utf8
</driver-url>
<driver-class>net.sourceforge.jtds.jdbc.Driver</driver-class>
<driver-class>com.mysql.jdbc.Driver</driver-class>
<driver-properties>
<property name="user" value="root" />
<property name="password" value="root" />
</driver-properties>
<minimum-connection-count>2</minimum-connection-count>
<maximum-connection-count>20</maximum-connection-count>
<maximum-connection-lifetime>18000000</maximum-connection-lifetime>
<!-- 5 hours -->
<house-keeping-test-sql>
values(current TimeStamp)
</house-keeping-test-sql>
<statistics>1m,15m,1d</statistics>
<statistics-log-level>INFO</statistics-log-level>
<fatal-sql-exception>
Connection is closed,SQLSTATE=08003,Error opening socket.
SQLSTATE=08S01,SQLSTATE=08S01
</fatal-sql-exception>
<fatal-sql-exception-wrapper-class>
org.logicalcobwebs.proxool.FatalRuntimeException
</fatal-sql-exception-wrapper-class>
<verbose>false</verbose>
</proxool>
以上是我的配置，但是我在测试时，可以正确从数据库中取得数据，但是保存却不能成功，也没有提示失败，请问这个是什么问题？