该程序在 windows 服务器 2008 r2 中工作，但在 windows 服务器 2012 r2 中不工作
the program works in windows server 2008 r2 but does not work in windows server 2012 r2
(请注意：此处post如有不妥，请管理员帮忙删除，谢谢)
背景：在windows server 2008 r2中有一个部署在tomcat 8上的应用程序。当前服务器 运行ning 正常，应用程序 运行s 正常。组长告诉我们，这个应用是一个两年前离职的程序员写的。程序在程序员离职后没有任何代码改动。
由于某些原因，我们必须将 windows server 2008 r2 更改（升级）为 windows server 2012 r2。
该应用程序需要 java 1.7 和 tomcat 8 到 运行，因此我们在 windows 服务器 2012 r2 中安装了这些软件ware。
我们从 windows server 2008 r2 复制 war 文件并粘贴到 windows server 2012 r2。复制并粘贴 war 文件后，我们在 tomcat Web 应用程序管理器中部署 war 文件（在 windows server 2008 r2 中的相同操作）。
部署 war 文件后，我们尝试启动应用程序。但是，当我们点击 "Start" 按钮时，稍等片刻， tomcat 消息显示 "FAIL - Application at context path/path-name could not be started".
我们检查了软ware版本，它们与windows server 2008 r2中的相同。
我们对该消息感到困惑，因为 war 文件在 windows 服务器 2008 r2 中工作。
我们检查 localhost.2017-07-13.log 文件，发现有一些异常。我们想要post这里的日志内容。
13-Jul-2017 15:00:42.464 INFO [http-nio-8080-exec-8]
org.apache.catalina.core.ApplicationContext.log Initializing Spring root
WebApplicationContext
13-Jul-2017 15:00:43.214 SEVERE [http-nio-8080-exec-8]
org.apache.catalina.core.StandardContext.listenerStart Exception sending
context initialized event to listener instance of class
org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'dataSource' defined in ServletContext resource [/WEB-
INF/applicationContext.xml]: Error setting property values; nested exception
is org.springframework.beans.PropertyBatchUpdateException; nested
PropertyAccessExceptions (1) are:
PropertyAccessException 1:
org.springframework.beans.MethodInvocationException: Property
'driverClassName' threw exception; nested exception is
java.lang.IllegalStateException: Could not load JDBC driver class
[net.sourceforge.jtds.jdbc.Driver]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.app
lyPropertyValues(AbstractAutowireCapableBeanFactory.java:1279)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.pop
ulateBean(AbstractAutowireCapableBeanFactory.java:1010)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doC
reateBean(AbstractAutowireCapableBeanFactory.java:472)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.r
un(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.cre
ateBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(Abstra
ctBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingle
ton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(Abstract
BeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstanti
ateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactory
Initialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractA
pplicationContext.java:380)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(Contex
tLoader.java:244)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextL
oader.java:187)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(Context
LoaderListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4729
)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5167
)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:466)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(Unknown Source)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(Unknown Source)
at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1460)
at org.apache.catalina.manager.HTMLManagerServlet.upload(HTMLManagerServlet.java:289)
at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:210)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:213)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: org.springframework.beans.PropertyBatchUpdateException; nested
PropertyAccessExceptions (1) are:
PropertyAccessException 1:
org.springframework.beans.MethodInvocationException: Property
'driverClassName' threw exception; nested exception is
java.lang.IllegalStateException: Could not load JDBC driver class
[net.sourceforge.jtds.jdbc.Driver]
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPro
pertyAccessor.java:104)
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPro
pertyAccessor.java:59)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.app
lyPropertyValues(AbstractAutowireCapableBeanFactory.java:1276)
... 64 more
我们不明白为什么该程序在 windows server 2008 r2 中运行但在 windows server 2012 r2 中不起作用？
目前我们仍在寻找程序的源代码，但从日志文件中，它提到了 [/WEB-INF/applicationContext.xml] 和 [net.sourceforge.jtds.jdbc.Driver]，我们猜测何时我们得到源代码，我们需要找到 xml 文件和驱动程序，是否正确？
感谢您的建议。谢谢。
编辑
我们只要找到源代码，然后打开 applicationContext.xml，就会有一个 net.sourceforge.jtds.jdbc.Driver 的 bean。不确定为什么它在 windows server 2012 r2.
中不起作用
代码如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/jee
http://www.springframework.org/schema/jee/spring-jee-2.5.xsd">
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver" />
<property name="url" value="jdbc:jtds:sqlserver://{host}:1433;DatabaseName=myDB" />
<property name="username" value="user" />
<property name="password" value="Password" />
</bean>
</beans>
你说（强调我的）
The application requires java 1.7 and tomcat 8 to run, so we installed
those software in windows server 2012 r2.
We copy the war file from windows server 2008 r2 and paste in windows
server 2012 r2. After copy and paste the war file, we deploy the war
file in tomcat web application manager (the same action in windows
server 2008 r2).
错误消息说
java.lang.IllegalStateException: Could not load JDBC driver class
[net.sourceforge.jtds.jdbc.Driver]
意思是：你没有充分复现原来的实现。因为您可能错过的不仅仅是这个驱动程序（它可能只是第一个失败的驱动程序），所以我建议对两个目录进行完整的比较。找出两个安装中部署的内容。
提示：Tomcat 在其 lib 目录中有一个全局类路径，其中包含每个 webapp 都可以使用的代码。
(请注意：此处post如有不妥，请管理员帮忙删除，谢谢)
背景：在windows server 2008 r2中有一个部署在tomcat 8上的应用程序。当前服务器 运行ning 正常，应用程序 运行s 正常。组长告诉我们，这个应用是一个两年前离职的程序员写的。程序在程序员离职后没有任何代码改动。
由于某些原因，我们必须将 windows server 2008 r2 更改（升级）为 windows server 2012 r2。
该应用程序需要 java 1.7 和 tomcat 8 到 运行，因此我们在 windows 服务器 2012 r2 中安装了这些软件ware。
我们从 windows server 2008 r2 复制 war 文件并粘贴到 windows server 2012 r2。复制并粘贴 war 文件后，我们在 tomcat Web 应用程序管理器中部署 war 文件（在 windows server 2008 r2 中的相同操作）。
部署 war 文件后，我们尝试启动应用程序。但是，当我们点击 "Start" 按钮时，稍等片刻， tomcat 消息显示 "FAIL - Application at context path/path-name could not be started".
我们检查了软ware版本，它们与windows server 2008 r2中的相同。
我们对该消息感到困惑，因为 war 文件在 windows 服务器 2008 r2 中工作。
我们检查 localhost.2017-07-13.log 文件，发现有一些异常。我们想要post这里的日志内容。
13-Jul-2017 15:00:42.464 INFO [http-nio-8080-exec-8]
org.apache.catalina.core.ApplicationContext.log Initializing Spring root
WebApplicationContext
13-Jul-2017 15:00:43.214 SEVERE [http-nio-8080-exec-8]
org.apache.catalina.core.StandardContext.listenerStart Exception sending
context initialized event to listener instance of class
org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'dataSource' defined in ServletContext resource [/WEB-
INF/applicationContext.xml]: Error setting property values; nested exception
is org.springframework.beans.PropertyBatchUpdateException; nested
PropertyAccessExceptions (1) are:
PropertyAccessException 1:
org.springframework.beans.MethodInvocationException: Property
'driverClassName' threw exception; nested exception is
java.lang.IllegalStateException: Could not load JDBC driver class
[net.sourceforge.jtds.jdbc.Driver]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.app
lyPropertyValues(AbstractAutowireCapableBeanFactory.java:1279)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.pop
ulateBean(AbstractAutowireCapableBeanFactory.java:1010)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doC
reateBean(AbstractAutowireCapableBeanFactory.java:472)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.r
un(AbstractAutowireCapableBeanFactory.java:409)
at java.security.AccessController.doPrivileged(Native Method)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.cre
ateBean(AbstractAutowireCapableBeanFactory.java:380)
at org.springframework.beans.factory.support.AbstractBeanFactory.getObject(Abstra
ctBeanFactory.java:264)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingle
ton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(Abstract
BeanFactory.java:261)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:185)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBe
anFactory.java:164)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstanti
ateSingletons(DefaultListableBeanFactory.java:429)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactory
Initialization(AbstractApplicationContext.java:728)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractA
pplicationContext.java:380)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(Contex
tLoader.java:244)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextL
oader.java:187)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(Context
LoaderListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4729
)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5167
)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:725)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:701)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)
at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:945)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:466)
at org.apache.catalina.startup.HostConfig.check(HostConfig.java:1556)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300)
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(Unknown Source)
at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(Unknown Source)
at org.apache.catalina.manager.ManagerServlet.check(ManagerServlet.java:1460)
at org.apache.catalina.manager.HTMLManagerServlet.upload(HTMLManagerServlet.java:289)
at org.apache.catalina.manager.HTMLManagerServlet.doPost(HTMLManagerServlet.java:210)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.CsrfPreventionFilter.doFilter(CsrfPreventionFilter.java:213)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.filters.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:108)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:617)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1521)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1478)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: org.springframework.beans.PropertyBatchUpdateException; nested
PropertyAccessExceptions (1) are:
PropertyAccessException 1:
org.springframework.beans.MethodInvocationException: Property
'driverClassName' threw exception; nested exception is
java.lang.IllegalStateException: Could not load JDBC driver class
[net.sourceforge.jtds.jdbc.Driver]
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPro
pertyAccessor.java:104)
at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPro
pertyAccessor.java:59)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.app
lyPropertyValues(AbstractAutowireCapableBeanFactory.java:1276)
... 64 more
我们不明白为什么该程序在 windows server 2008 r2 中运行但在 windows server 2012 r2 中不起作用？
目前我们仍在寻找程序的源代码，但从日志文件中，它提到了 [/WEB-INF/applicationContext.xml] 和 [net.sourceforge.jtds.jdbc.Driver]，我们猜测何时我们得到源代码，我们需要找到 xml 文件和驱动程序，是否正确？
感谢您的建议。谢谢。
编辑
我们只要找到源代码，然后打开 applicationContext.xml，就会有一个 net.sourceforge.jtds.jdbc.Driver 的 bean。不确定为什么它在 windows server 2012 r2.
中不起作用代码如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:jee="http://www.springframework.org/schema/jee"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-2.5.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-2.5.xsd
http://www.springframework.org/schema/jee
http://www.springframework.org/schema/jee/spring-jee-2.5.xsd">
<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="net.sourceforge.jtds.jdbc.Driver" />
<property name="url" value="jdbc:jtds:sqlserver://{host}:1433;DatabaseName=myDB" />
<property name="username" value="user" />
<property name="password" value="Password" />
</bean>
</beans>
你说（强调我的）
The application requires java 1.7 and tomcat 8 to run, so we installed those software in windows server 2012 r2.
We copy the war file from windows server 2008 r2 and paste in windows server 2012 r2. After copy and paste the war file, we deploy the war file in tomcat web application manager (the same action in windows server 2008 r2).
错误消息说
java.lang.IllegalStateException: Could not load JDBC driver class [net.sourceforge.jtds.jdbc.Driver]
意思是：你没有充分复现原来的实现。因为您可能错过的不仅仅是这个驱动程序（它可能只是第一个失败的驱动程序），所以我建议对两个目录进行完整的比较。找出两个安装中部署的内容。
提示：Tomcat 在其 lib 目录中有一个全局类路径，其中包含每个 webapp 都可以使用的代码。