请求!jdbc连接mysql数据库出现“Communications link failure.The last packet sent…”(附源码及错误信息) [问题点数:20分]

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连接MySQL数据库时出现 Communications link failure The last packet sent successfully to the server was 0 mill
  第一次写csdn博客,略有紧张。java小小白一个,如有错误,还望各位大神指正才是。 华丽丽的分割线~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~·~~~     在做实验的过程中遇到了上述错误提示,百度的好多个方法,如下图: (来源于CSDN的其他人的博客解决方法,没看懂最后一个什么意思,都没有解决我的问题|||)     最终解决办法是:...
多线程连接MySQL数据库,报 Communications link failure
大概是这样的思路,扫描2000+的MySQL服务器,通过我的弱口令表去挨个<em>连接</em>他们(大概100个账户),看看能否成功,如果成功则证明检查不合格。共5个thread,一个thread中包含一个大循环遍历账户表,然后每次new 一个DataBaseInfo ,调用ConnectDatabase()这个来判断是否成功。当运行一段时间后,<em>出现</em>Communications <em>link</em> failure,最终所有的线程都会停止在ConnectDatabase()中,不抛异常,不停止。用的jdk1.5rnpublic class DataBaseInfo rnrn //do morern public boolean ConnectDatabase()rn rn tryrn rn Class.forName(driver); rn if (conn!=null)rn rn conn.close(); rn rn DriverManager.setLoginTimeout(120);rn conn=DriverManager.getConnection(this.Url,this.Account,this.Password);rn //SimpleLogger.Write("Succeeded connecting to the Database!");rn conn.close();rn return true; rn rn catch(Exception e)rn rn //SimpleLogger.WriteError("Database: Error:"); rn System.out.println(this.Url+this.Account+this.Password+"---"+e.getMessage());rn e.printStackTrace();rn rn this.Close();rn return false;rn rn rn
用MyEclipse6连接mysql数据库出现Communications link failure
我装了mysql服务,也装了navicat,用mysql<em>连接</em>本地是可以的,可是<em>连接</em>别人的机器出<em>连接</em>不成功! rnrn然后用MyEclipse6.6随便写一个Java程序,<em>连接</em><em>mysql数据库</em>时<em>出现</em>Communications <em>link</em> failure错,具体错误如下: rnrncom.mysql.<em>jdbc</em>.CommunicationsException: Communications <em>link</em> failure rnrnLast <em>packet</em> <em>sent</em> to the server was 0 ms ago. rnat com.mysql.<em>jdbc</em>.SQLError.createCommunicationsException(SQLError.java:1070) rnat com.mysql.<em>jdbc</em>.ConnectionImpl.createNewIO(ConnectionImpl.java:2120) rnat com.mysql.<em>jdbc</em>.ConnectionImpl. (ConnectionImpl.java:723) rnat com.mysql.<em>jdbc</em>.ConnectionImpl.getInstance(ConnectionImpl.java:298) rnat com.mysql.<em>jdbc</em>.NonRegisteringDriver.connect(NonRegisteringDriver.java:282) rnat java.sql.DriverManager.getConnection(Unknown Source) rnat java.sql.DriverManager.getConnection(Unknown Source) rnat com.stu.entity.TestCon.main(TestCon.java:17) rnrn如果哪位遇到过,请帮我解答一下,经理他说不管我了,要我把它解决掉! rnrn急急急。。。。。。 rn谢谢啦!!!!!!
Java程序连接mysql数据库出现CommunicationsException: Communications link failure错误的问题
[img=https://img-bbs.csdn.net/upload/201812/20/1545311440_204967.png][/img][img=https://img-bbs.csdn.net/upload/201812/20/1545311440_427696.png][/img][img=https://img-bbs.csdn.net/upload/201812/20/1545311440_722711.png][/img]rnrnrnrn生产一直暴这个rn百度了下说以下操作可以解决这个问题,但是也试了 没用求大神请教rnwait_timeout=31536000 rnrninteractive_timeout=31536000 rnrn rnrn将过期时间修改为1年。 rnrn rnrn二是在<em>连接</em>URL上添加参数:&autoReconnect=true&failOverReadOnly=false
Mysql jdbc 连接异常:Last packet sent to the server was 18948 ms ago
com.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: Communications <em>link</em> failurernrnLast <em>packet</em> <em>sent</em> to the server was 18948 ms ago.rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.<em>jdbc</em>.Util.handleNewInstance(Util.java:406)rn at com.mysql.<em>jdbc</em>.SQLError.createCommunicationsException(SQLError.java:1074)rn at com.mysql.<em>jdbc</em>.MysqlIO.reuseAndReadPacket(MysqlIO.java:3009)rn at com.mysql.<em>jdbc</em>.MysqlIO.reuseAndReadPacket(MysqlIO.java:2895)rn at com.mysql.<em>jdbc</em>.MysqlIO.checkErrorPacket(MysqlIO.java:3438)rn at com.mysql.<em>jdbc</em>.MysqlIO.sendCommand(MysqlIO.java:1951)rn at com.mysql.<em>jdbc</em>.MysqlIO.sqlQueryDirect(MysqlIO.java:2101)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.execSQL(ConnectionImpl.java:2554)rn at com.mysql.<em>jdbc</em>.PreparedStatement.executeInternal(PreparedStatement.java:1761)rn at com.mysql.<em>jdbc</em>.PreparedStatement.executeUpdate(PreparedStatement.java:2046)rn at com.mysql.<em>jdbc</em>.PreparedStatement.executeBatchSerially(PreparedStatement.java:1650)rn at com.mysql.<em>jdbc</em>.PreparedStatement.executeBatch(PreparedStatement.java:1108)rn at com.cattsoft.parse.xml.sax.dao.EMSDao.execute(EMSDao.java:202)rn at com.cattsoft.parse.xml.sax.SaxHandler.dealRowData(SaxHandler.java:152)rn at com.cattsoft.parse.xml.sax.SaxHandler.startElement(SaxHandler.java:72)rn at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)rn at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)rn at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)rn at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)rn at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)rn at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)rn at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)rn at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)rn at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)rn at javax.xml.parsers.SAXParser.parse(Unknown Source)rn at javax.xml.parsers.SAXParser.parse(Unknown Source)rn at com.cattsoft.parse.xml.sax.SaxParser.call(SaxParser.java:37)rn at com.cattsoft.parse.xml.sax.SaxParser.call(SaxParser.java:1)rn at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)rn at java.util.concurrent.FutureTask.run(Unknown Source)rn at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)rn at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)rn at java.lang.Thread.run(Unknown Source)rnCaused by: java.net.SocketException: Software caused connection abort: recv failedrn at java.net.SocketInputStream.socketRead0(Native Method)rn at java.net.SocketInputStream.read(Unknown Source)rn at com.mysql.<em>jdbc</em>.util.ReadAheadInputStream.fill(ReadAheadInputStream.java:113)rn at com.mysql.<em>jdbc</em>.util.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:160)rn at com.mysql.<em>jdbc</em>.util.ReadAheadInputStream.read(ReadAheadInputStream.java:188)rn at com.mysql.<em>jdbc</em>.MysqlIO.readFully(MysqlIO.java:2452)rn at com.mysql.<em>jdbc</em>.MysqlIO.reuseAndReadPacket(MysqlIO.java:2906)rn ... 30 morernrn上面就是异常情况:mysql 已经设置21天的wait_outtime;<em>连接</em>方面:没一小段时间都会主动发送一个探测:select 1 from dual;不过没解决这个问题;
The last packet sent successfully to the server was 0 milliseconds ago. The driv
在本地写好的程序,发到服务器上数据库<em>连接</em>失败;rnlinux+mysqlrn[b]出错信息[/b]rnThe <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds ago. The driver has not received any <em>packet</em>s from the server.)rn at org.springframework.<em>jdbc</em>.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:83)rn at org.springframework.<em>jdbc</em>.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)rn at org.springframework.<em>jdbc</em>.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)rn at org.springframework.orm.hibernate3.HibernateAccessor.convertJdbcAccessException(HibernateAccessor.java:424)rn at org.springframework.orm.hibernate3.HibernateAccessor.convertHibernateAccessException(HibernateAccessor.java:410)rn at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:412)rn at org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:375)rn at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:913)rn at org.springframework.orm.hibernate3.HibernateTemplate.find(HibernateTemplate.java:905)rn at com.harmony.dao.common.impl.CommonDaoImpl.getMedias(CommonDaoImpl.java:29)rn at com.harmony.service.common.CommonService.getMedias(CommonService.java:19)rn at com.harmony.controller.common.CommonContraller.getMedia(CommonContraller.java:36)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)rn at java.lang.reflect.Method.invoke(Method.java:606)rn at org.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)rn at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)rn at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)rn at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:743)rn at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:672)rn at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:82)rn at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:919)rn at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:851)rn at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)rn at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:855)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)rn at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)rn at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)rn at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)rn at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)rn at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)rn at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)rn at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)rn at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)rn at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)rn at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)rn at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)rn at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)rn at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)rn at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)rn at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)rn at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)rn at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)rn at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)rn at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)rn at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)rn at java.lang.Thread.run(Thread.java:744)rnCaused by: org.apache.commons.dbcp.SQLNestedException: Cannot create PoolableConnectionFactory (Communications <em>link</em> failurernrnThe <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds ago. The driver has not received any <em>packet</em>s from the server.)rn at org.apache.commons.dbcp.BasicDataSource.createPoolableConnectionFactory(BasicDataSource.java:1549)rn at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:1388)rn at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:1044)rn at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:83)rn at org.hibernate.<em>jdbc</em>.ConnectionManager.openConnection(ConnectionManager.java:423)rn at org.hibernate.<em>jdbc</em>.ConnectionManager.getConnection(ConnectionManager.java:144)rn at org.hibernate.<em>jdbc</em>.AbstractBatcher.prepareQueryStatement(AbstractBatcher.java:139)rn at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1547)rn at org.hibernate.loader.Loader.doQuery(Loader.java:673)rn at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:236)rn at org.hibernate.loader.Loader.doList(Loader.java:2213)rn at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2104)rn at org.hibernate.loader.Loader.list(Loader.java:2099)rn at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:378)rn at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:338)rn at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:172)rn at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1121)rn at org.hibernate.impl.QueryImpl.list(QueryImpl.java:79)rn at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:922)rn at org.springframework.orm.hibernate3.HibernateTemplate$30.doInHibernate(HibernateTemplate.java:913)rn at org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:407)rn ... 43 morernCaused by: com.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: Communications <em>link</em> failurern[b]数据源配置[/b]rnrn rn rn rn rn rnrn在网上找解决方法,试着更改my.cnf,没有用,大神解决一下
急!!The last packet sent successfully to the server was 0 milliseconds ago.的问题
一个Flex+J2EE的项目,用的是eclipse3.4,Spring+Hibernate架构,mysql5.1数据库。rn项目是在实验室的台式机上开发的,笔记本只是在项目开始的时候配置好了环境,距现在已经将近一年了,现在要用笔记本进行演示,可是<em>出现</em>了这个问题:[code=Java]rn18:58:52,151 WARN SettingsFactory:137 - Could not obtain connection to query metadatarncom.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: Communications <em>link</em> failurernrnThe <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds ago. The driver has not received any <em>packet</em>s from the server.rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.<em>jdbc</em>.Util.handleNewInstance(Util.java:406)rn at com.mysql.<em>jdbc</em>.SQLError.createCommunicationsException(SQLError.java:1074)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.createNewIO(ConnectionImpl.java:2214)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.(ConnectionImpl.java:781)rn at com.mysql.<em>jdbc</em>.JDBC4Connection.(JDBC4Connection.java:46)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.<em>jdbc</em>.Util.handleNewInstance(Util.java:406)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.getInstance(ConnectionImpl.java:352)rn at com.mysql.<em>jdbc</em>.NonRegisteringDriver.connect(NonRegisteringDriver.java:284)rn at java.sql.DriverManager.getConnection(Unknown Source)rn at java.sql.DriverManager.getConnection(Unknown Source)rn at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:133)rn at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:114)rn at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2163)rn at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2159)rn at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1383)rn at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:855)rn at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:774)rn at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)rn at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1460)rn at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1400)rn at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513)rn at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:450)rn at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:290)rn at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)rn at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:287)rn at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:189)rn at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:545)rn at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:871)rn at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:423)rn at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:272)rn at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:196)rn at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:47)rn at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3830)rn at org.apache.catalina.core.StandardContext.start(StandardContext.java:4337)rn at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)rn at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)rn at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)rn at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)rn at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)rn at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)rn at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)rn at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)rn at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)rn at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)rn at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)rn at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)rn at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)rn at org.apache.catalina.core.StandardService.start(StandardService.java:516)rn at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)rn at org.apache.catalina.startup.Catalina.start(Catalina.java:566)rn at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)rn at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)rn at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)rn at java.lang.reflect.Method.invoke(Unknown Source)rn at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)rn at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)rnCaused by: com.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: Communications <em>link</em> failure[/code]rnrn在网上查了好久,大部分是说mysql的间隔访问时间太长导致的,但是,我的系统是前段时间重新安装的,数据库自然也是重新安装的,eclipse是绿色版的软件,里面直接集成的Flex,我在台式机上把eclipse文件夹拷贝到笔记本上,无论怎么调试也都是这个结果,求求各位路过的大神帮帮忙,看看到底是怎么回事啊rnmysql的url没有配置错误:<em>jdbc</em>:mysql://localhost/accountsystemrn我都快急死了,演示在即,希望大家帮帮忙吧
Tomcat报错last packet sent to the server was 0 ms ago
[img=http://hiphotos.baidu.com/yuanquanfeng/mpic/item/43620af4f5e7f14bddc474b5.jpg][/img]这个是什么问题啊,我重启Tomcat服务又可以运行了.rn网上说是localhost改127.0.0.1rn我都没有用localhost啊,rn我的项目是用struts+hibernate完成的rn
jdbc连接mysql数据库出现了问题
我想做一些java数据库方面的程序,可在进行mysql驱动程序的<em>连接</em>时<em>出现</em>了问题?rn我下载的驱动名是:mysql-connector-java-3.1.13rn 在classpath中做了设置,E:\database\mysql-connector-java-3.1.13\mysql-connector-java-3.1.13-bin.jarrn写的测试程序是如下:(<em>mysql数据库</em>已经启动)rnimport java.sql.*; rnrnpublic class DBTest rnpublic static void main(String[] args) rnString driver = "org.git.mm.mysql.Driver";rnString url = "<em>jdbc</em>:mysql://localhost:3306/test";rnString user = ""; rnString password = ""; rntry rnClass.forName(driver); rnConnection conn = DriverManager.getConnection(url, user, password); rnif(!conn.isClosed()) rnSystem.out.println("数据库<em>连接</em>成功!"); rnconn.close(); rn rncatch(ClassNotFoundException e) rnSystem.out.println("找不到驱动程序"); rne.printStackTrace(); rn rncatch(SQLException e) rne.printStackTrace(); rn rn rnrn数据库名为:test,用户名和密码都为空.rn可是老是<em>出现</em>异常:Exception in thread "main" java.lang.NoClassDefFoundError: org/aspectj/lang/Signaturernmysql的版本是:5.0.22rn是不是数据库和驱动不兼容?别人的数据库和驱动都和我的一样,可能运行?rn是不是系统设置的问题?rn我先谢谢大家了?rn
jdbc连接mysql数据库出现错误
一段简单的测试代码,但是<em>出现</em>错误!rn设置classpath=D:\Tomcat4.1\common\lib\mm.mysql-2.0.14-bin.jarrn代码:rnimport java.sql.*;rnpublic class database rn public static void Main(String[] args) rn Class.forName("org.gjt.mm.mysql.Driver").newInstance();rn java.sql.Connection conn;rn conn =rn DriverManager.getConnection(rn "<em>jdbc</em>:mysql:3306//localhost/new_db_1?user=root&password=12345678");rn rn rnrn不知道该怎么改正!谢谢!
JDBC连接MySQL数据库的流程及源码
JDBC<em>连接</em>MySQL数据库的流程 第一步:导入jar驱动包     1.鼠标放在工程目录下的src目录上,点击右键,选择Build Path     2.在Build Path下选择configure Build Path...     3.点击选择Libraries,并在右边选择Add External JARs...     4.找到提前准备好的<em>jdbc</em>的jar包并点击打开  ...
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet success
新发布的应用,昨天一天正常运行,没有问题,但是今天早上刚刚一测试就报错:rncom.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: The <em>last</em> <em>packet</em> successfully received from the server was 60,547,352 milliseconds ago. The <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 60,547,352 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.rnrn日志文件从这个地方开始往下只要是数据库操作就开始报错:rncom.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.MySQLNonTransientConnectionException: No operations allowed after connection closed.rnrn还有这个错:rnNo operations allowed after connection closed.rnrn再往下就是:rnjava.sql.SQLException: Operation not allowed after ResultSet closedrn at com.mysql.<em>jdbc</em>.SQLError.createSQLException(SQLError.java:1074)rn at com.mysql.<em>jdbc</em>.SQLError.createSQLException(SQLError.java:988)rn at com.mysql.<em>jdbc</em>.SQLError.createSQLException(SQLError.java:974)rn at com.mysql.<em>jdbc</em>.SQLError.createSQLException(SQLError.java:919)rn at com.mysql.<em>jdbc</em>.ResultSetImpl.checkClosed(ResultSetImpl.java:803)rn at com.mysql.<em>jdbc</em>.ResultSetImpl.next(ResultSetImpl.java:6985)rn at com.dz.servlet.LoginServlet.service(LoginServlet.java:54)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)rn at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)rn at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)rn at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)rn at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)rn at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)rn at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)rn at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)rn at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)rn at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:845)rn at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:688)rn at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1315)rn at java.lang.Thread.run(Unknown Source)rnrnrn数据库版本:mysql 5.1.50rn服务器版本:tomcat5.5rn上面所有的错误重启tomcat后就没有了,但是,总不能让我每天都跑来重启服务器吧,所以这个问题还得解决,要想解决这个问题就得靠坛子里的大佬们了!!各位高手!请指点一下!!
JDBC连接MySQL报错Communications link failure due to underlying exception
代码是这个样子的,求高手指点。rnpackage com.cn.<em>jdbc</em>;rnrnimport java.sql.DriverManager;rnrnimport java.sql.SQLException;rnrnimport com.mysql.<em>jdbc</em>.Connection;rnrnpublic class JDBC_Connection rn static String drivername = "com.mysql.<em>jdbc</em>.Driver";rn static String url = "<em>jdbc</em>:mysql://localhost:8080/zcl";rn static String username = "root";rn static String password = "root";rn staticrn try rn Class.forName(drivername);rn System.out.println("创建驱动成功");rn catch(ClassNotFoundException e)rn e.printStackTrace();rn rn rn public static Connection getConnection()rn Connection conn = null;rn rn tryrn conn = (Connection) DriverManager.getConnection(url,username,password);rn System.out.println("<em>连接</em>数据库成功访");rn catch(SQLException e)rn System.out.println("数据库<em>连接</em>失败!");rn e.printStackTrace();rn rn return conn;rn rn rn public static void main(String [] args)rn JDBC_Connection.getConnection();rn rnrn
myeclipse在连接mysql数据源的时候为何总显示the last packet sent successfully to the server was
显示the <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds agorn[img=https://img-bbs.csdn.net/upload/201509/21/1442815264_840941.png][/img][img=https://img-bbs.csdn.net/upload/201509/21/1442815273_647075.png][/img]rnrn各位大神求教了[img=https://forum.csdn.net/PointForum/ui/scripts/csdn/Plugin/001/face/9.gif][/img]因为我最近在学hibernate这个连不上好麻烦[img=https://forum.csdn.net/PointForum/ui/scripts/csdn/Plugin/001/face/9.gif][/img]再次感谢大家
用myeclipse链接MYSQL数据库的时候出现last packet sent to the server was 0 ms ago 请问怎么解决 谢谢
connection URL <em>jdbc</em>:mysql:localhost:8080/testrnadd jar is mysql-connector-java-5.1.7-bin.jarrn其他设置正确 请大家帮忙看看 谢谢~~
解决JDBC连接MySQL数据库出现中文乱码的问题
解决方案:在原有<em>连接</em>MySQL数据库的代码基础上添加:?useUnicode=true&amp;amp;characterEncoding=utf-8 如: 首先创建一张表: 通过以下代码将userid为“1001”的“马芸”同学username修改为“任正肥”, public static void main(String[] args) throws ClassNotFoundExcept...
JDBC连接MySQL数据库时出现的乱码问题
JDBC <em>连接</em> MySQL数据库时<em>出现</em>的乱码问题,从六个方面来考虑:   一、在编写页面时就<em>出现</em>了乱码   二、在浏览器解析时<em>出现</em>了乱码   三、由 JSP编译器 在编译成 Servlet 时<em>出现</em>了乱码   四、由数据库中的字段编码格式引起的乱码   五、JDBC <em>连接</em> MySQL数据库 时,没有拼接 useUnicode=true&characterEncoding=utf-8 的参数   六、MySQL中的编码设
JDBC连接Mysql数据库出现NoClassDefFoundError错误
import java.sql.*;rnrnpublic class Mysqlrnrnpublic static void main(String[] args) rnrn try rn String driver = "org.gjt.mm.mysql.Driver";rn String url = "<em>jdbc</em>:mysql://localhost:3306/test";//server是数据库名rn String user = "root";rn String password = "";rn Connection conn = null;rn ResultSet rs = null;rn Statement stmt = null;rn Class.forName(driver).newInstance();rn conn = DriverManager.getConnection(url, user, password);rn stmt = conn.createStatement();rn rs = stmt.executeQuery("select *");rn while (rs.next()) rn System.out.println("" + rs.getInt(1) + "");rn System.out.println(":" + "");rn rn rs.close();rn conn.close();rn rn catch (Exception e) rn e.printStackTrace();rn rn rnrnrn如上源代码,编译可以通过,运行时<em>出现</em>NoClassDefFoundError错误,为什么?rnclasspath加了JDBC的驱动路径,也加了. 但还是有错,什么原因?
JDBC连接MySQL数据库出现的时区不一致的解决办法
首先把我的jar包放出来给你们看一下,提前说一下,版本高的jar包约束太多,这就是你<em>连接</em><em>出现</em>问题的原因,而配置两个时间要一致太繁琐了。所以,我给出如下解决办法。jar包我一开始下载的是官网最新的8.0.11版本的,结果,如下,说服务器程序和JDBC的时区时间不一致,<em>连接</em>失败。后来我在网上找了一大堆资料,最后自己琢磨勒一下,发现是因为我下载的jar包的版本太高了,会<em>出现</em>这种时区不一致的问题,因为新版...
JDBC连接MySQL数据库出现的错误及解决方法整理
1. 在JDBC使用的时候有时候会<em>出现</em>java.sql.SQLException: The server time zone value ‘???ú±ê×??±??’ is unrecognized or repre<em>sent</em>s…的错误,具体错误如下: 注: <em>出现</em>这个的原因是因为 mysql返回的时间总是有问题,比实际时间要早8小时。 解决办法:在url后面加useUnicode=true&amp...
使用jdbc连接mysql数据库出现的错误!!
IE运行时提示错误如下:(只是一个简单的struts程序)rntype Status reportrnrnmessage Servlet action is not availablernrndescription The requested resource (Servlet action is not available) is not available.rnrnrnrnrnstruts-config.xml中的项配置如下:rn rn rn rn rn rn rn rn rn rn rn rn rn rn rn rnrn如果在struts-config.xml中去掉配置,程序运行正常!!rn但如果加上配置项,程序会<em>出现</em>上面提示的错误!!!rnrn但是为了<em>连接</em><em>mysql数据库</em>,必须这么配置啊,兄弟们帮助me解决问题啊!!rnrn非常感谢了!! :)
MyEclipse连接mysql出错:Communications link failure
[size=11px][color=#FF0000]JAVA类代码:[/color][/size]import java.sql.*;rnrnpublic class TestJDBC rnrn public static void main(String[] args) rn ResultSet rs = null;rn Statement stmt = null;rn Connection conn = null;rn try rn Class.forName("com.mysql.<em>jdbc</em>.Driver");rn rn conn = DriverManager.getConnection("<em>jdbc</em>:mysql://localhost:8080/heng","root","root");rn stmt = conn.createStatement();rn rs = stmt.executeQuery("select * from ur");rn while(rs.next()) rn System.out.println(rs.getInt("userno"));rn System.out.println(rs.getString("username"));rn System.out.println(rs.getString("userpassword"));rn System.out.println(rs.getString("useraddress"));rn rn catch (ClassNotFoundException e) rn e.printStackTrace();rn catch (SQLException e) rn e.printStackTrace();rn finally rn try rn if(rs != null) rn rs.close();rn rs = null;rn rn if(stmt != null) rn stmt.close();rn stmt = null;rn rn if(conn != null) rn conn.close();rn conn = null;rn rn catch (SQLException e) rn e.printStackTrace();rn rn rn rnrnrnrn[color=#FF0000]报错:[/color]com.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: Communications <em>link</em> failurernrnThe <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds ago. The driver has not received any <em>packet</em>s from the server.rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.<em>jdbc</em>.Util.handleNewInstance(Util.java:409)rn at com.mysql.<em>jdbc</em>.SQLError.createCommunicationsException(SQLError.java:1122)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.createNewIO(ConnectionImpl.java:2260)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.(ConnectionImpl.java:787)rn at com.mysql.<em>jdbc</em>.JDBC4Connection.(JDBC4Connection.java:49)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.<em>jdbc</em>.Util.handleNewInstance(Util.java:409)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.getInstance(ConnectionImpl.java:357)rn at com.mysql.<em>jdbc</em>.NonRegisteringDriver.connect(NonRegisteringDriver.java:285)rn at java.sql.DriverManager.getConnection(Unknown Source)rn at java.sql.DriverManager.getConnection(Unknown Source)rn at TestJDBC.main(TestJDBC.java:12)rnCaused by: com.mysql.<em>jdbc</em>.exceptions.<em>jdbc</em>4.CommunicationsException: Communications <em>link</em> failurernrnThe <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds ago. The driver has not received any <em>packet</em>s from the server.rn at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)rn at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)rn at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)rn at java.lang.reflect.Constructor.newInstance(Unknown Source)rn at com.mysql.<em>jdbc</em>.Util.handleNewInstance(Util.java:409)rn at com.mysql.<em>jdbc</em>.SQLError.createCommunicationsException(SQLError.java:1122)rn at com.mysql.<em>jdbc</em>.MysqlIO.(MysqlIO.java:344)rn at com.mysql.<em>jdbc</em>.ConnectionImpl.createNewIO(ConnectionImpl.java:2181)rn ... 12 morernCaused by: java.net.ConnectException: Connection refused: connectrn at java.net.PlainSocketImpl.socketConnect(Native Method)rn at java.net.PlainSocketImpl.doConnect(Unknown Source)rn at java.net.PlainSocketImpl.connectToAddress(Unknown Source)rn at java.net.PlainSocketImpl.connect(Unknown Source)rn at java.net.SocksSocketImpl.connect(Unknown Source)rn at java.net.Socket.connect(Unknown Source)rn at java.net.Socket.connect(Unknown Source)rn at java.net.Socket.(Unknown Source)rn at java.net.Socket.(Unknown Source)rn at com.mysql.<em>jdbc</em>.StandardSocketFactory.connect(StandardSocketFactory.java:256)rn at com.mysql.<em>jdbc</em>.MysqlIO.(MysqlIO.java:293)rn ... 13 morern
maven项目出现中数据库Communications link failure
错误:rn Build error for /eid-generator/pom.xml; org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.mybatis.generator:mybatis-generator-maven-plugin:1.3.2:generate (Generate MyBatis Artifacts) on project eid-generator: Communications <em>link</em> failurernrnThe <em>last</em> <em>packet</em> <em>sent</em> successfully to the server was 0 milliseconds ago. The driver has not received any <em>packet</em>s from the server.rnrn[size=18px][color=#FF0000]POM.xml代码:[/color][/size]rnrn[code=html]rn 4.0.0rn rn eidrn eidrn 1.0.0rn rn eid-generatorrn eid-generatorrn jarrn eid-generatorrn ****平台-<em>源码</em>生成工具rnrn rn rn mysqlrn mysql-connector-javarn $version.mysqlrn rn rn org.mybatis.generatorrn mybatis-generator-corern $version.mybatis-generatorrn rn rn org.mybatisrn mybatisrn $version.mybatisrn rn rnrn rn rn rn src/main/javarn rn **/*Mapper.xmlrn rn rn rn src/main/resourcesrn rn **/*.xmlrn **/*.propertiesrn rn truern rn rn rn rn org.apache.maven.pluginsrn maven-compiler-pluginrn 2.3.2rn rn $version.jdkrn $version.jdkrn rn rn rn org.mybatis.generatorrn mybatis-generator-maven-pluginrn $version.mybatis-generatorrn rn src/main/resources/generatorConfig.xmlrn truern truern rn rn rn Generate MyBatis Artifactsrn rn generatern rn rn rn rn rn org.mybatis.generatorrn mybatis-generator-corern $version.mybatis-generatorrn rn rn mysqlrn mysql-connector-javarn $version.mysqlrn rn rn org.mybatisrn mybatisrn $version.mybatisrn rn rn rn rn rn rn rn org.eclipse.m2ern lifecycle-mappingrn 1.0.0rn rn rn rn copy-dependency pluginrn rn rn org.apache.maven.pluginsrn maven-dependency-pluginrn [1.0.0,)rn rn copy-dependenciesrn resourcesrn rn rn rn rn rn rn rn rn org.mybatis.generatorrn mybatis-generator-maven-pluginrn rn [$version.mybatis-generator,)rn rn generatern rn rn rn rn rn rn rn rn rn rn rn rn rn[/code]rnrn[size=18px]rn[color=#FF0000]rngeneratorConfig.xml代码:[/color][/size]rn[code=html]rnrnrn rn rnrn rn rn rn rnrn rn rnrn rn rn rn rnrn rn rn rn rn rnrn rn rn rnrn rn rn rnrn rnrn rn[/code]
链接MySql 出现 Communications link failure
执行jar包,<em>出现</em>rnCommunications <em>link</em> failurernrnLast <em>packet</em> <em>sent</em> to the server was 0 ms ago.rn错误rnrn网上查了下,据说是链接打开一段时间没有处理超时,于是在my.cnf配置里面加上了timeout时间rnrn但是我只是在执行jar包的之后链接DB。rn并且链接DB取出数据后就close链接了。rnrn搞不懂为什么会<em>出现</em>这个问题。
jdbc连接mysql数据库
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JDBC连接MySQL数据库
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.Statement; public class JDBCDemo { public static void main(String[] args) throws Exception { ...
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package qddx.JDBC; import java.sql.*;public class JDBC_Connection { static String driverName = "com.mysql.<em>jdbc</em>.Driver";//驱动名 static String url="<em>jdbc</em>:mysql://localhost/bbs";//地址 static Strin
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public static void main(String[] args){ ResultSet rs=null;//创建结果集 PreparedStatement pre=null;//创建执行sql语句对象 Connection conn=null;//创建数据库链接对象 try{ Class.f
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第一种:package dbutil; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class DBUtil { static { try { //加载数据库驱动程序 Class.forName(&quot;com.mysql.<em>jdbc</em>....
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JDBC连接MySql数据库的问题
我有一个<em>jdbc</em>test.jsp的程序,<em>源码</em>如下:rn rnrn运行后却<em>出现</em>如下错误:rnApache Tomcat/4.0.3 - HTTP Status 500 - Internal Server Errorrnrn--------------------------------------------------------------------------------rnrntype Exception reportrnrnmessage Internal Server Errorrnrndescription The server encountered an internal error (Internal Server Error) that prevented it from fulfilling this request.rnrnexception rnrnjavax.servlet.ServletException: org.gjt.mm.mysql.Driverrn at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:463)rn at org.apache.jsp.<em>jdbc</em>test$jsp._jspService(<em>jdbc</em>test$jsp.java:72)rn at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)rn at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)rn at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)rn at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)rn at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)rn at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)rn at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)rn at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1012)rn at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)rn at java.lang.Thread.run(Thread.java:536)rnrnrnroot cause rnrnjava.lang.ClassNotFoundException: org.gjt.mm.mysql.Driverrn at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1394)rn at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1243)rn at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:198)rn at org.apache.jasper.servlet.JasperLoader.loadClass(JasperLoader.java:132)rn at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:322)rn at java.lang.Class.forName0(Native Method)rn at java.lang.Class.forName(Class.java:130)rn at org.apache.jsp.<em>jdbc</em>test$jsp._jspService(<em>jdbc</em>test$jsp.java:61)rn at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)rn at org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(JspServlet.java:202)rn at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:382)rn at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:474)rn at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)rn at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247)rn at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193)rn at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:243)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:190)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2343)rn at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:170)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:170)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:468)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:564)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:174)rn at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline.java:566)rn at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:472)rn at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)rn at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:1012)rn at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1107)rn at java.lang.Thread.run(Thread.java:536)rnrn不知道是什么原因,请高手指教!
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