这是第二次整理这个文章：
首先说明proxool连接池有两种配置方式：
第一种：采用jdbc.properties的方式
第二种：采用proxool.xml的配置方
后面在完善这两种配置方式（在上班哦，某有时间整理了）
最近整合项目中连接池技术遇到一个问题，tomcat启动的时候就会报这个异常，项目中是用proxool.xml文件存放连接池的信息（我用的是第二种配置方式）,内容如下：
<?xml version="1.0" encoding="UTF-8"?>
<something-else-entirely>
<proxool>
<alias>test</alias>
<driver-url>jdbc:sqlserver://localhost:1433;databaseName=test
</driver-url>
<driver-class>com.microsoft.sqlserver.jdbc.SQLServerDriver
</driver-class>
<driver-properties>
<property name="user" value="sa" />
<property name="password" value="sa" />
</driver-properties>
<!-- proxool自动侦察各个连接状态的时间间隔(毫秒),侦察到空闲的连接就马上回收,超时的销毁 默认30秒 -->
<house-keeping-sleep-time>900000</house-keeping-sleep-time>
<!-- 最大连接数(默认5个),超过了这个连接数,再有请求时,就排在队列中等候,最大的等待请求数由maximum-new-connections决定 -->
<maximum-connection-count>200</maximum-connection-count>
<!--没有空闲连接可以分配而在队列中等候的最大请求数,超过这个请求数的用户连接就不会被接受 -->
<maximum-new-connections>10</maximum-new-connections>
<!-- 线程最大存活时间，超过此时间的线程将被守护线程kill掉，默认值为5分钟 -->
<maximum-active-time>300000</maximum-active-time>
<!--最小连接数(默认2个) -->
<minimum-connection-count>100</minimum-connection-count>
<!-- 最少保持的空闲连接数，注意与minimum-connection-count区分。默认值为0 -->
<prototype-count>20</prototype-count>
<!--最大的等待请求数，默认值为10 -->
<simultaneous-build-throttle>20</simultaneous-build-throttle>
<statistics>1d</statistics>
<test-before-use>true</test-before-use>
<house-keeping-test-sql>select 1</house-keeping-test-sql>
</proxool>
</something-else-entirely>
在spring的配置中是这样配置的：
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="org.logicalcobwebs.proxool.ProxoolDriver"/>
<property name="url" value="proxool.test"/><!-- 这个地方是用的连接池的别名，所以可以在配置文件中配置多个连接池 -->
</bean>
注意加粗部分，关键就在这里，我们项目中用了多个连接池，所以会配置成proxool.test，但是我整合的项目中只要用这种方式就会报错，花了我好长时间，今天早上突然发现原来我的web.xml中忘了配置：
<!-- 配置proxool连接池 -->
<servlet>
<servlet-name>ServletConfigurator</servlet-name>
<servlet-class>org.logicalcobwebs.proxool.configuration.ServletConfigurator</servlet-class>
<init-param>
<param-name>xmlFile</param-name>
<param-value>WEB-INF/proxool.xml</param-value>
</init-param>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet>
<servlet-name>Admin</servlet-name>
<servlet-class>org.logicalcobwebs.proxool.admin.servlet.AdminServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Admin</servlet-name>
<url-pattern>/info</url-pattern>
</servlet-mapping>
忘了写这个配置了，这个配置估计是注册连接池用的，因为没有在web.xml中配置这个，所以会造成下面的异常，在web中添加上面的配置就好了。
异常详情：
org.logicalcobwebs.proxool.ProxoolException: Attempt to refer to a unregistered pool by its alias 'test'
at org.logicalcobwebs.proxool.ConnectionPoolDefinition.doChange(ConnectionPoolDefinition.java:246)
at org.logicalcobwebs.proxool.ConnectionPoolDefinition.<init>(ConnectionPoolDefinition.java:143)
at org.logicalcobwebs.proxool.ProxoolFacade.registerConnectionPool(ProxoolFacade.java:96)
at org.logicalcobwebs.proxool.ProxoolDriver.connect(ProxoolDriver.java:77)
at java.sql.DriverManager.getConnection(DriverManager.java:582)
at java.sql.DriverManager.getConnection(DriverManager.java:154)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:173)
at org.springframework.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriver(DriverManagerDataSource.java:164)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnectionFromDriver(AbstractDriverBasedDataSource.java:149)
at org.springframework.jdbc.datasource.AbstractDriverBasedDataSource.getConnection(AbstractDriverBasedDataSource.java:119)
at org.apache.ibatis.mapping.DefaultDatabaseIdProvider.getDatabaseProductName(DefaultDatabaseIdProvider.java:63)
at org.apache.ibatis.mapping.DefaultDatabaseIdProvider.getDatabaseName(DefaultDatabaseIdProvider.java:53)
at org.apache.ibatis.mapping.DefaultDatabaseIdProvider.getDatabaseId(DefaultDatabaseIdProvider.java:41)
at org.mybatis.spring.SqlSessionFactoryBean.buildSqlSessionFactory(SqlSessionFactoryBean.java:395)
at org.mybatis.spring.SqlSessionFactoryBean.afterPropertiesSet(SqlSessionFactoryBean.java:295)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1545)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1483)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:589)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:647)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:598)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:661)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:517)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:458)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:138)
at javax.servlet.GenericServlet.init(GenericServlet.java:212)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1206)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1026)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:4421)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4734)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1079)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:1002)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:506)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:840)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463)
at org.apache.catalina.core.StandardService.start(StandardService.java:525)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:754)
at org.apache.catalina.startup.Catalina.start(Catalina.java:595)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)