[Proxool-user] why:It has been automatically closed by Proxool for some reason

[赵. <zh...@vi...>]

hi,
   our application deploys on weblogic and use proxool as the connection pool(not JNDI),after running for some time(may be several days),then the following error would occur(cause the web page error），we don't know why.any answer is appreciated!!!
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<bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource" destroy-method="close">
        <property name="driver" value="${DB.DRIVER}" />
        <property name="driverUrl" value="${DB.URL}" />
        <property name="user" value="${DB.USER}" />
        <property name="password" value="${DB.PWD}" />
        <property name="alias" value="pool_db" />
        <property name="prototypeCount" value="5" />
        <property name="maximumConnectionCount" value="100" />
        <property name="minimumConnectionCount" value="10" />
        <property name="simultaneousBuildThrottle" value="200" />
        <property name="houseKeepingTestSql" value="select CURRENT_DATE from dual" />
        <property name="trace" value="true" />
        <property name="verbose" value="true" />
    </bean>
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-- Check the SQL Statement (preparation failed). --- Cause: java.sql.SQLException: Couldn't perform the operation prepareStatement: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs).; nested exception is com.ibatis.common.jdbc.exception.NestedSQLException:
--- The error occurred while executing query.
 --- Check the SQL Statement (preparation failed). 
--- Cause: java.sql.SQLException: Couldn't perform the operation prepareStatement: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs).