tomcat程序連接服務器mysql數據庫，報

錯誤，后來用java程序直接連接數據庫，發現可以連得上，可以操作數據庫，

在網上查了設置數據庫連接等待時間(wait_timeout)設置，也沒用。

奇怪的一點是，盡管控制臺報錯，但是還可以實現本人寫的那個查詢功能，可以從數據庫中查到數據顯示到頁面

org.apache.commons.dbcp.SQLNestedException:?Cannot?create?PoolableConnectionFactory?(Communications?link?failure

The?last?packet?sent?successfully?to?the?server?was?0?milliseconds?ago.?The?driver?has?not?received?any?packets?from?the?server.)

at?org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:855)

at?org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)

at?org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)

at?org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:72)

at?org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1881)

at?org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1174)

at?org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:805)

at?org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:745)

at?org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)

at?org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1175)

at?org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1145)

at?org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:427)

at?org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)

at?org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:144)

at?org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)

at?org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)

at?org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:261)

at?org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:109)

at?org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1073)

at?org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:835)

at?org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:423)

at?org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:251)

at?org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:144)

at?org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:248)

at?org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:160)

at?org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:279)

at?org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:360)

at?org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:241)

at?org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)

at?com.base.common.spring.SpringContextLoaderServlet.init(SpringContextLoaderServlet.java:23)

at?javax.servlet.GenericServlet.init(GenericServlet.java:158)

at?org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1284)

at?org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1197)

at?org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1087)

at?org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5262)

at?org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5550)

at?org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)

at?org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901)

at?org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877)

at?org.apache.catalina.core.StandardHost.addChild(StandardHost.java:649)

at?org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1245)

at?org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1895)

at?java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)

at?java.util.concurrent.FutureTask.run(FutureTask.java:262)

at?java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)

at?java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)

at?java.lang.Thread.run(Thread.java:745)

Caused?by:?com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:?Communications?link?failure

The?last?packet?sent?successfully?to?the?server?was?0?milliseconds?ago.?The?driver?has?not?received?any?packets?from?the?server.

at?sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native?Method)

at?sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at?sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at?java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at?com.mysql.jdbc.Util.handleNewInstance(Util.java:409)

at?com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1118)

at?com.mysql.jdbc.MysqlIO.(MysqlIO.java:343)

at?com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2308)

at?com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2122)

at?com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:774)

at?com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:49)

at?sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native?Method)

at?sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)

at?sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)

at?java.lang.reflect.Constructor.newInstance(Constructor.java:526)

at?com.mysql.jdbc.Util.handleNewInstance(Util.java:409)

at?com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:375)

at?com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:289)

at?org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:37)

at?org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:290)

at?org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:877)

at?org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:851)

…?46?more

Caused?by:?java.net.ConnectException:?Connection?refused:?connect

at?java.net.DualStackPlainSocketImpl.connect0(Native?Method)

at?java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)

at?java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)

at?java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)

at?java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)

at?java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)

at?java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)

at?java.net.Socket.connect(Socket.java:579)

at?java.net.Socket.connect(Socket.java:528)

at?java.net.Socket.(Socket.java:425)

at?java.net.Socket.(Socket.java:241)

at?com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:256)

at?com.mysql.jdbc.MysqlIO.(MysqlIO.java:292)

…?61?more

解決方案

20

Caused?by:?java.net.ConnectException:?Connection?refused:?connect

這個是數據庫拒絕連接，可能是數據庫服務器達到了最大連接數

The?last?packet?sent?successfully?to?the?server?was?0?milliseconds?ago.?The?driver?has?not?received?any?packets?from?the?server.

答：可能是數據庫回收了連接，緩沖池不知道，繼續使用被回收的連接所致的。可以在jdbc字符串中增加&autoReconnect=true

奇怪的一點是，盡管控制臺報錯，但是還可以實現本人寫的那個查詢功能，可以從數據庫中查到數據顯示到頁面

答：hibernate的緩存

20

jdbc字符串中增加&autoReconnect=true

哪個文件中寫了jdbc，那里就加上

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