ubuntu tomcat出现java.lang.ClassNotFoundEx?报错
先贴报错：
十二月 07, 2014 10:14:29 下午 org.apache.tomcat.jdbc.pool.ConnectionPool init 严重: Unable to create initial connections of pool. java.sql.SQLException: com.mysql.jdbc.Driver at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254) at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635) at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:486) at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:144) at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116) at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103) at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:554) at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:242) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:141) at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321) at org.apache.naming.NamingContext.lookup(NamingContext.java:842) at org.apache.naming.NamingContext.lookup(NamingContext.java:153) at org.apache.naming.NamingContext.lookup(NamingContext.java:830) at org.apache.naming.NamingContext.lookup(NamingContext.java:167) at org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1091) at org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:670) at org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:269) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5355) 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:632) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857) at java.util.concurrent.Executors$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: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246) ... 32 more 十二月 07, 2014 10:14:29 下午 org.apache.naming.NamingContext lookup 警告: Unexpected exception resolving reference java.sql.SQLException: com.mysql.jdbc.Driver at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:254) at org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635) at org.apache.tomcat.jdbc.pool.ConnectionPool.init(ConnectionPool.java:486) at org.apache.tomcat.jdbc.pool.ConnectionPool.<init>(ConnectionPool.java:144) at org.apache.tomcat.jdbc.pool.DataSourceProxy.pCreatePool(DataSourceProxy.java:116) at org.apache.tomcat.jdbc.pool.DataSourceProxy.createPool(DataSourceProxy.java:103) at org.apache.tomcat.jdbc.pool.DataSourceFactory.createDataSource(DataSourceFactory.java:554) at org.apache.tomcat.jdbc.pool.DataSourceFactory.getObjectInstance(DataSourceFactory.java:242) at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:141) at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321) at org.apache.naming.NamingContext.lookup(NamingContext.java:842) at org.apache.naming.NamingContext.lookup(NamingContext.java:153) at org.apache.naming.NamingContext.lookup(NamingContext.java:830) at org.apache.naming.NamingContext.lookup(NamingContext.java:167) at org.apache.catalina.core.NamingContextListener.addResource(NamingContextListener.java:1091) at org.apache.catalina.core.NamingContextListener.createNamingContext(NamingContextListener.java:670) at org.apache.catalina.core.NamingContextListener.lifecycleEvent(NamingContextListener.java:269) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5355) 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:632) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1073) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1857) 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: java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:274) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:246) ... 32 more
ubuntu直接从软件源装的tomcat7，apt-get install tomcat7
启动tomcat的时候发现报错java.lang.ClassNotFoundException: com.mysql.jdbc.Driver查看了一下/var/lib/tomcat7/webapps/app/WEB-INF/这个目录，是有mysql-connector-java-5.1.20-bin.jar这个jar包的，但是不知道为什么启动就报错找不到mysql jdbc。
我试着从apache网站上下载tomcat的,tar.gz包，把app.war扔进去部署，没有一点问题，根本不报这个错误。抱着不死心的态度，我试着把mysql jdbc拷贝到tomcat的lib下/usr/share/tomcat7/lib，重启tomcat，神奇的发现这个问题消失了。
实在想不明白为什么，ubuntu的tomcat到底用了什么黑科技，WEB-INF/lib下那么多jar包，唯独报mysql jdbc找不到，别的jar包都能正常加载。
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https://developer.aliyun.com/profile/5yerqm5bn5yqg?spm=a2c6h.12873639.0.0.6eae304abcjaIB你的tomcat配置了数据库连接池了吧，即在server.xml中配置的
diff对比了一下，除了端口问题别的没不一样，又搜索了一下关键字，mysql,jdbc,pool都搜索了，没有……你提醒我了，我这就去看一下server.xml。我用的是默认配置，直接启动的。你提醒我了，ubuntu打包的tomcat和官方的配置不一样，以前我就注意到server.xml这个文件ubuntu的tomcat默认是不开启ajp13端口的。准备再比对一下看看不是放在<spanstyle="font-family:Verdana,sans-serif,宋体;font-size:14px;line-height:22px;background-color:#FFFFFF;">/WEB-INF/下的lib？嗯，是在WEB-INF/lib<imgsrc="http://www.oschina.net/js/ke/plugins/emoticons/images/5.gif"alt=""> 我以前也遇到了这个问题，mysql的jar包不能加载。https://scottlinux.com/2014/02/20/tomcat-on-debian-and-ubuntu-linux-fix-broken-com-mysql-jdbc-driver-connection/google到一个，说是ubuntu的tomcat打包有问题2020-06-14 19:04:10赞同 展开评论 打赏
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