cmd编译servlet报错

    cmd下编译servlet文件时报错，看看环境变量classpath是否配置了jdk\lib\*.jar;如果已配置了，则添加servlet-api-*.jar文件至jdk安装目录\jre\lib\ext下，再次编译即可。
    
     请注意：如果你上面使用的是servlet-api-2.5[版本之下].jar文件的话，那么使用tomcat6运行项目时可能会产生如下错误：

java.lang.NoSuchMethodError: javax.servlet.ServletContext.getContextPath()Ljava/lang/String;
	at com.sun.faces.config.WebConfiguration.getServletContextName(WebConfiguration.java:221)
	at com.sun.faces.config.WebConfiguration.<init>(WebConfiguration.java:82)
	at com.sun.faces.config.WebConfiguration.getInstance(WebConfiguration.java:152)
	at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:279)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
	at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
	at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
	at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:526)
	at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:987)
	at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:909)
	at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:495)
	at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1206)
	at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:314)
	at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)

     原因是由于servlet-api-2.5[版本之下].jar文件不支持。则换个servlet-api-2.5[版本之上].jar文件即可；或者直接使用tomcat6\lib\servlet-api.jar也可。