[java异常注意]

1

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java.lang.ClassNotFoundException:com.mysql.jdbc.Driver

java只需导入mysql jar; web myeclipse不会去查找字符集，驱动，copy到lib下.

2

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严重: Allocate exception for servlet inputStuInfoServletjava.lang.ClassNotFoundException: inputStuInfo.inputStuInfoServlet    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1333)    at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1167)    at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:509)    at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:490)    at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:118)    at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)    at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:817)    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:94)    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:620)    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:502)    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1132)    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:684)    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1533)    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1489)    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)    at java.lang.Thread.run(Thread.java:745)

缘由：我一开始在别的包创建了一个servlet，删除并在servlet包创建了同名的servlet文件，xml中的servlet-class路径还是原来的servlet文件的路径，所以导致了没有发现类