proxool配置如下：
proxool.xml
<?xml version="1.0" encoding="UTF-8"?> <something-else-entirely> <proxool> <alias>dbname</alias> <!--数据源的别名--> <driver-url>jdbc:mysql://localhost:3306/mysqltest?useUnicode=true&characterEncoding=utf8</driver-url><!--url连接--> <driver-class>com.mysql.jdbc.Driver</driver-class> <!--驱动类--> <driver-properties> <property name="user" value="root" /> <!--用户名--> <property name="password" value="root" /><!--密码--> </driver-properties> <!--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>100</maximum-connection-count> <!--最小连接数(默认2个)--> <minimum-connection-count>10</minimum-connection-count> <!--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>90000</house-keeping-sleep-time> <!--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> <!--最少保持的空闲连接数(默认2个)--> <prototype-count>5</prototype-count> </proxool> </something-else-entirely>
hibernate-context.xml
<beans> ....添加 <bean id="dataSource" class="org.logicalcobwebs.proxool.ProxoolDataSource" > <property name="alias"> <value>dbname</value> </property> <property name="driver"> <value>com.mysql.jdbc.Driver</value> </property> <property name="driverUrl"> <value>jdbc:mysql://localhost:3306/mysqltest?useUnicode=true&characterEncoding=utf8</value> </property> <property name="user"> <value>root</value> </property> <property name="password"> <value>root</value> </property> <property name="minimumConnectionCount"> <value>10</value> </property> <property name="maximumConnectionCount"> <value>100</value> </property> <property name="prototypeCount"> <value>5</value> </property> </bean> .... </beans>
web.xml
<web-app> ....添加 <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>1</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>/admin</url-pattern> </servlet-mapping> <!-- 配置受保护域，只有Tomcat管理员才能察看连接池的信息 --> <security-constraint> <web-resource-collection> <web-resource-name>proxool</web-resource-name> <url-pattern>/admin</url-pattern> </web-resource-collection> <auth-constraint> <role-name>manager</role-name> </auth-constraint> </security-constraint> <login-config> <auth-method>BASIC</auth-method> <realm-name>proxool manager Application</realm-name> </login-config> <security-role> <description> The role that is required to log in to the Manager Application </description> <role-name>manager</role-name> </security-role> .... </web-app>
添加jar包
proxool-0.9.1.jar
proxool-cglib.jar
出现异常,异常信息如下所示：
exception1
2012-10-12 15:23:58 ERROR interceptor.TransactionInterceptor (TransactionAspectSupport.java:287) - Application exception overridden by rollback exception org.springframework.jdbc.UncategorizedSQLException: Hibernate operation: could not execute query; uncategorized SQLException for SQL [select contentflo0_.id as id17_, contentflo0_.contentid as contentid17_, contentflo0_.flowtaskid as flowtaskid17_ from contentflowtask contentflo0_, content content1_ where contentflo0_.contentid=content1_.id and contentflo0_.contentid=1830 and content1_.isdelete=0 order by contentflo0_.id desc]; SQL state [08003]; error code [0]; No operations allowed after connection closed. Connection was closed explicitly by the application at the following location: ** BEGIN NESTED EXCEPTION ** java.lang.Throwable STACKTRACE: java.lang.Throwable at com.mysql.jdbc.Connection.close(Connection.java:1123) at org.logicalcobwebs.proxool.AbstractProxyConnection.reallyClose(AbstractProxyConnection.java:173) at org.logicalcobwebs.proxool.ConnectionPool.removeProxyConnection(ConnectionPool.java:413) at org.logicalcobwebs.proxool.HouseKeeper.sweep(HouseKeeper.java:139) at org.logicalcobwebs.proxool.HouseKeeperThread.run(HouseKeeperThread.java:39) ** END NESTED EXCEPTION ** ; nested exception is java.sql.SQLException: No operations allowed after connection closed. Connection was closed explicitly by the application at the following location: ** BEGIN NESTED EXCEPTION ** java.lang.Throwable STACKTRACE: java.lang.Throwable at com.mysql.jdbc.Connection.close(Connection.java:1123) at org.logicalcobwebs.proxool.AbstractProxyConnection.reallyClose(AbstractProxyConnection.java:173) at org.logicalcobwebs.proxool.ConnectionPool.removeProxyConnection(ConnectionPool.java:413) at org.logicalcobwebs.proxool.HouseKeeper.sweep(HouseKeeper.java:139) at org.logicalcobwebs.proxool.HouseKeeperThread.run(HouseKeeperThread.java:39) ** END NESTED EXCEPTION ** java.sql.SQLException: No operations allowed after connection closed. Connection was closed explicitly by the application at the following location: ** BEGIN NESTED EXCEPTION ** java.lang.Throwable STACKTRACE: java.lang.Throwable at com.mysql.jdbc.Connection.close(Connection.java:1123) at org.logicalcobwebs.proxool.AbstractProxyConnection.reallyClose(AbstractProxyConnection.java:173) at org.logicalcobwebs.proxool.ConnectionPool.removeProxyConnection(ConnectionPool.java:413) at org.logicalcobwebs.proxool.HouseKeeper.sweep(HouseKeeper.java:139) at org.logicalcobwebs.proxool.HouseKeeperThread.run(HouseKeeperThread.java:39) ** END NESTED EXCEPTION ** at com.mysql.jdbc.Connection.checkClosed(Connection.java:2474) at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1370) at com.mysql.jdbc.Connection.prepareStatement(Connection.java:1350) at sun.reflect.GeneratedMethodAccessor67.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.logicalcobwebs.proxool.ProxyConnection.invoke(ProxyConnection.java:68) at org.logicalcobwebs.cglib.proxy.Proxy$ProxyImpl$$EnhancerByCGLIB$$edd30696.prepareStatement(<generated>) at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:497) at org.hibernate.jdbc.AbstractBatcher.getPreparedStatement(AbstractBatcher.java:415) at org.hibernate.jdbc.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139) at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1561) at org.hibernate.loader.Loader.doQuery(Loader.java:661) at or.....
exception2
2012-10-12 16:16:19 ERROR transaction.JDBCTransaction (JDBCTransaction.java:67) - JDBC begin failed java.sql.SQLException: Couldn't perform the operation getAutoCommit: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see logs). at org.logicalcobwebs.proxool.WrappedConnection.invoke(WrappedConnection.java:207) at org.logicalcobwebs.proxool.WrappedConnection.intercept(WrappedConnection.java:87) at $java.sql.Connection$$EnhancerByProxool$$3f2ab9d8.getAutoCommit(<generated>) at org.hibernate.transaction.JDBCTransaction.begin(JDBCTransaction.java:57) at org.hibernate.impl.SessionImpl.beginTransaction(SessionImpl.java:1319) ......
出现异常结果都表明使用proxool连接时出现连接超时，具体原因如下：
<maximum-active-time>一个活动连接最大活动时间默认5分钟，如果超过这个时间则proxool连接会自动断开。
即在proxool.xml中修改：
proxool.xml
<?xml version="1.0" encoding="UTF-8"?> <something-else-entirely> <proxool> <alias>dbname</alias> <driver-url>jdbc:mysql://localhost:3306/mysqltest?useUnicode=true&characterEncoding=utf8</driver-url> <driver-class>com.mysql.jdbc.Driver</driver-class> <driver-properties> <property name="user" value="root" /> <property name="password" value="root" /> </driver-properties> <!--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>100</maximum-connection-count> <!--最小连接数(默认2个)--> <minimum-connection-count>10</minimum-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> <!--最少保持的空闲连接数(默认2个)--> <prototype-count>5</prototype-count> <!--一个活动连接最大活动时间默认5分钟--> <maximum-active-time>3600000</maximum-active-time> <!--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--> <house-keeping-sleep-time>60000</house-keeping-sleep-time> <!--Test SQL(SELECT getDate()) --> <house-keeping-test-sql>select sysdate() </house-keeping-test-sql> </proxool> </something-else-entirely>