log4j:错误JDBCAppender:：flush_buffer（），：java.sql.SQLException:未找到适合jdbc的驱动程序：mysql://localhost:3306/

我正在使用log4j登录我的web应用程序。工作正常。但无论何时启动tomcat服务器，都会出现以下异常：

log4j:ERROR JDBCAppender::flush_buffer(), : 
java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/MYPROJECT?createDatabaseIfNotExist=true&useUnicode=true&characterEncoding=utf-8&autoReconnect=true
    at java.sql.DriverManager.getConnection(DriverManager.java:602)
    at java.sql.DriverManager.getConnection(DriverManager.java:185)
    at org.apache.log4j.jdbcplus.JDBCDefaultConnectionHandler.getConnection(JDBCDefaultConnectionHandler.java:77)
    at org.apache.log4j.jdbcplus.JDBCDefaultConnectionHandler.getConnection(JDBCDefaultConnectionHandler.java:53)
    at org.apache.log4j.jdbcplus.JDBCLogger.prepareConnection(JDBCLogger.java:489)
    at org.apache.log4j.jdbcplus.JDBCLogger.append(JDBCLogger.java:555)
    at org.apache.log4j.jdbcplus.JDBCAppender.flush_buffer(JDBCAppender.java:887)
    at org.apache.log4j.jdbcplus.JDBCAppender.append(JDBCAppender.java:867)
    at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:230)
    at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:65)
    at org.apache.log4j.Category.callAppenders(Category.java:203)
    at org.apache.log4j.Category.forcedLog(Category.java:388)
    at org.apache.log4j.Category.log(Category.java:853)
    at org.jboss.logging.Log4jLogger.doLogf(Log4jLogger.java:53)
    at org.jboss.logging.Logger.logf(Logger.java:2112)
    at org.hibernate.internal.CoreMessageLogger_$logger.recognizedObsoleteHibernateNamespace(CoreMessageLogger_$logger.java:2397)
    at org.hibernate.internal.util.xml.DTDEntityResolver.resolveEntity(DTDEntityResolver.java:74)
    at org.hibernate.cfg.EJB3DTDEntityResolver.resolveEntity(EJB3DTDEntityResolver.java:59)
    at org.apache.xerces.util.EntityResolverWrapper.resolveEntity(Unknown Source)
    at org.apache.xerces.impl.XMLEntityManager.resolveEntity(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentScannerImpl$DTDDispatcher.dispatch(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
    at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
    at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
    at org.dom4j.io.SAXReader.read(SAXReader.java:465)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2015)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:1971)
    at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:282)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:420)
    at org.springframework.beans.factory.BeanFactoryUtils.beansOfTypeIncludingAncestors(BeanFactoryUtils.java:277)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.detectPersistenceExceptionTranslators(PersistenceExceptionTranslationInterceptor.java:139)
    at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.<init>(PersistenceExceptionTranslationInterceptor.java:79)
    at org.springframework.dao.annotation.PersistenceExceptionTranslationAdvisor.<init>(PersistenceExceptionTranslationAdvisor.java:70)
    at org.springframework.dao.annotation.PersistenceExceptionTranslationPostProcessor.setBeanFactory(PersistenceExceptionTranslationPostProcessor.java:103)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeAwareMethods(AbstractAutowireCapableBeanFactory.java:1475)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1443)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)
    at org.springframework.context.support.AbstractApplicationContext.registerBeanPostProcessors(AbstractApplicationContext.java:734)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:457)
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:383)
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4961)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5455)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)

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如果在启动tomcat时出现错误，它将如何工作？您是否已将mysql连接器jar放在tomcat目录的lib目录中？是的。mysql连接器jar位于lib文件夹中。应用程序已成功启动。。但在服务器启动时获得该例外。log4j没有检测到jar。。如何解决这个问题是应用程序库目录中的连接器jar？如果您的应用程序已经启动，并且您遇到了这个问题，那么您的应用程序将无法找到这个jar。连接器jar位于我的应用程序库和tomcat库中。但我还是犯了这个错误。log4j无法检测驱动器。如何解决这个问题？？