问一个关于Connection reset的问题？？？

Question

我用struts2+hibernate+spring的框架，oracle10g数据库，启动tomcate可以正常运行程序，过一段时间以后大约一小时或两小时，刷新页面就会出现Connection reset这个错误，这应该怎么解决呢，我的连接数据库配置如下
hibernate.xml如下
<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"><!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>    <session-factory>
    
                
    
 
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="hibernate.proxool.pool_alias">DBPool</property>
<property name="hibernate.proxool.xml">proxool.xml</property>
<property name="hibernate.connection.release_mode">auto</property>
<property name="hibernate.cglib.use_reflection_optimizer">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.connection.ProxoolConnectionProvider</property>
<property name="hibernate.show_sql">false</property>
<property name="hibernate.connection.autocommit">true</property>
   
       <mapping resource="com/zy/po/eventMng/Eventgpsinfo.hbm.xml" />
        
         
    </session-factory></hibernate-configuration>
proxool.xml如下<?xml version="1.0" encoding="utf-8"?>
<something-else-entirely> <proxool>
<alias>DBPool</alias>
<driver-url>
jdbc:oracle:thin:@192.168.28.202:1521:orcl
</driver-url>
<driver-class>oracle.jdbc.driver.OracleDriver</driver-class>
<driver-properties>
<property name="user" value="chinasos" />
<property name="password" value="chinasos098" />
</driver-properties>
<prototype-count>5</prototype-count>
    <maximum-connection-count>5000</maximum-connection-count> 
    <minimum-connection-count>10</minimum-connection-count> 
    <simultaneous-build-throttle>100</simultaneous-build-throttle> 
    <!-- <maximum-active-time>5</maximum-active-time> -->
<trace>true</trace>
  </proxool>
</something-else-entirely>