应用访问Mysql遇到的连接问题

最近在做一个小项目，开发环境：数据库mysql5.0，服务器Tomcat5.5。项目打成war部署在tomcat上之后，通过应用进行查询操作，如果操作过于频繁，后台会抛如下异常：
javax.servlet.ServletException: Hibernate operation: Cannot open connection; uncategorized SQLException for SQL [???]; SQL state [08S01]; error code [0]; Communications link failure due to underlying exception:
 
** BEGIN NESTED EXCEPTION **
 
java.net.SocketException
MESSAGE: java.net.BindException: Address already in use: connect
 
STACKTRACE:
 
java.net.SocketException: java.net.BindException: Address already in use: connect
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:156)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284)
        at com.mysql.jdbc.Connection.createNewIO(Connection.java:2569)
        at com.mysql.jdbc.Connection.<init>(Connection.java:1485)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionfromDriverManager(DriverManagerDataSource.java:291)
    at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionfromDriverManager(DriverManagerDataSource.java:277
。。。。。。
在网上查了很多资料，也在论坛里发帖提问，发现是连接数占用的问题。应用里连接采用的是JDBC直连，后来改成了通过缓冲池连接。
换成缓冲池连接的时候，程序打包要注意，程序lib下的naming-factory.jar，naming-factory-dbcp.jar,naming-resources.jar都要删掉，mysql的连接jar包也要删掉，之后再打包。同时还