java 连接池数量异常？

java使用tomcat连接池，配置如下
        ds.setPassword(tRPassword);

    ds.setTestOnBorrow(true);
    ds.setValidationInterval(30 * 1000);
    ds.setRemoveAbandoned(true);
    ds.setRemoveAbandonedTimeout(30);   //30second
    ds.setLogAbandoned(true);
    ds.setMaxIdle(config.getInt("database.source.pool.idle.max"));
    //database.source.pool.idle.max=5
    ds.setMinIdle(config.getInt("database.source.pool.idle.min"));
    //database.source.pool.idle.min=1
    ds.setMaxActive(config.getInt("database.source.pool.active.max"));
    //database.source.pool.active.max=5
    ds.setInitialSize(1);
    //ds.setMinEvictableIdleTimeMillis(30000);
    //ds.setTestWhileIdle(false);
    //ds.setTimeBetweenEvictionRunsMillis(5000);
    //ds.setMaxAge(100);
    

然后运行阶段，就会出现6个连接……

[root@AIOPS ~]# netstat -anlp|grep 3307

tcp6 0 0 10.0.0.3:61740 10.0.0.6:3307 ESTABLISHED 11255/java

tcp6 0 0 10.0.0.3:60830 10.0.0.6:3307 ESTABLISHED 11255/java

tcp6 0 0 10.0.0.3:61234 10.0.0.6:3307 ESTABLISHED 11255/java

tcp6 0 0 10.0.0.3:60368 10.0.0.6:3307 ESTABLISHED 11255/java

tcp6 0 0 10.0.0.3:60388 10.0.0.6:3307 ESTABLISHED 11255/java

tcp6 0 0 10.0.0.3:60366 10.0.0.6:3307 ESTABLISHED 11255/java

[root@AIOPS ~]#

有什么原因嘛？