安装milter-limit配置postfix限制邮件账号发送量

弄了3天，还是没有搞定。
配置：
winxp+tomcat5.0.28+hibernate3.1+spring1.2.6+struts1.0+mysql5.0.17,做了一个小blog。没有配置连接池时，运转良好。用c3p0配置后，每次都会出现3或者5个新连接。然后发现数据库连接不能释放。出现很多sleep连接。直到全部连接占满。
出现：错误表现：

javax.servlet.ServletException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [null]; error code [0]; Connections could not be acquired from the underlying database!; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database

数据库的表现是：



类似的问题，但没有都没有很好的解决方法。
引用06-21-2006 spring论坛一问题。
http://forum.springframework.org/showthread.php?t=26124
JavaEye
求助,Spring+Hibernate连接池无法释放问题,贴出详细代码
http://www.iteye.com/topic/32378下面是applicationContext.xml的配置：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

<!-- for properties files -->
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:c3p0.properties</value>
</list>
</property>
</bean>

<!-- for dataSource -->
<bean id="dataSource"  class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${jdbc.driver}" />
<property name="jdbcUrl" value="${jdbc.url}" />

<property name="properties">
<props>
<prop key="c3p0.minPoolSize">${hibernate.c3p0.minPoolSize}</prop>
<prop key="hc3p0.maxPoolSize">${hibernate.c3p0.maxPoolSize}</prop>
<prop key="hc3p0.timeout">${hibernate.c3p0.timeout}</prop>
<prop key="c3p0.max_statement">${hibernate.c3p0.max_statement}</prop>
<prop key="user">${jdbc.username}</prop>
<prop key="password">${jdbc.password}</prop>
<prop key="c3p0.testConnectionOnCheckout">true</prop>
</props>
</property>
</bean>

<bean id="sessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">

<property name="dataSource">
<ref bean="dataSource" />
</property>
<property name="mappingResources">
<list>
<value>com/voff/hibernate/Blog.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
org.hibernate.dialect.MySQLDialect
</prop>
<prop key="hibernate.show_sql">
true
</prop>
<prop key="hibernate.connection.provider_class">
org.hibernate.connection.C3P0ConnectionProvider
</prop>
</props>
</property>
</bean>

<!-- transactionManager -->
<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref bean="sessionFactory"/>
</property>
</bean>

<bean id="BlogDao" class="com.voff.dao.BlogDaoimpl">
<property name="sessionFactory">
<ref bean="sessionFactory"/>
</property>
</bean>

<!-- spring dao proxy -->
<bean id="BlogDaoProxy" class="org.springframework.transaction.interceptor.TransactionProxyFactoryBean">
<property name="transactionManager">
<ref bean="transactionManager"/>
</property>
<property name="proxyInterfaces">
<list>
<value>com.voff.dao.BlogDao</value>
</list>
</property>
<property name="target">
<ref bean="BlogDao"/>
</property>
<property name="transactionAttributes">
<props>
<prop key="insert">PROPAGATION_REQUIRED</prop>
<prop key="save*">PROPAGATION_REQUIRED</prop>
<prop key="update*">PROPAGATION_REQUIRED</prop>
<prop key="find*">PROPAGATION_REQUIRED</prop>
<prop key="*">PROPAGATION_REQUIRED,readOnly</prop>
</props>
</property>

</bean>

</beans>

c3p0.properties的配置是：

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost/spring?useUnicode=true&characterEncoding=UTF-8
jdbc.username=root
jdbc.password=

hibernate.c3p0.minPoolSize=5
hibernate.c3p0.maxPoolSize=20
hibernate.c3p0.timeout=100
hibernate.c3p0.max_statement=50

BlogDaoimpl的代码是：

package com.voff.dao;

import java.util.ArrayList;
import java.util.List;

import org.hibernate.Query;
import org.hibernate.Session;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;

import com.voff.hibernate.Blog;

public class BlogDaoimpl extends HibernateDaoSupport implements BlogDao{

public void addblog(Blog blog) {
getHibernateTemplate().save(blog);

}

public void delblog(int id) {

Object blog=getHibernateTemplate().load(Blog.class,id);
getHibernateTemplate().delete(blog);

}

public void updateblog(Blog blog) {
getHibernateTemplate().update(blog);

}

public Blog getblog(int id){
return (Blog) getHibernateTemplate().get(Blog.class,id);
}

public int Totallimitblog(int caid,String bauthor){
String sql = "from Blog where cateid='"+caid+"' and bauthor ='"+bauthor+"'";
List total = getHibernateTemplate().find(sql);

return total.size();
}

public ArrayList showblog(int firstRow,int maxRow,int caid,String bauthor){
List   list=new   ArrayList();

Session   session  =  getHibernateTemplate().getSessionFactory().openSession();
Query   query   =session.createQuery("from Blog where cateid='"+caid+"' and bauthor ='"+bauthor+"' order by blogid desc");
query.setFirstResult(firstRow);
query.setMaxResults(maxRow);
list=query.list();
session.flush();
session.close();
return   (ArrayList) list;
}

}

请各位高手帮我看看，到底是什么原因（连接池问题，还是代码问题（不用连接池运转良好）导致数据库sleep连接不能释放。谢谢！