我在TOMCAT的WEB下调用了一个JSP页面，然后把SERVLET放到\webapps\web\WEB-INF\classes里面，在SERVER.XML中也把context项改为如下（我的包名是untitled2） <Context path="/untitled2" docBase="webapps/untitled2" crossContext="false" debug="0" reloadable="true" > </Context> <Context path="/web" docBase="webapps/web" crossContext="false" debug="0" reloadable="true" > </Context> 但现在总是报错 Error: 500 Location: /web/servlet/UploadFileServlet Internal Servlet Error: java.lang.NullPointerException at java.lang.ClassLoader.resolveClass0(Native Method) at java.lang.ClassLoader.resolveClass(ClassLoader.java:641) at org.apache.tomcat.loader.AdaptiveClassLoader.loadClass(AdaptiveClassLoader.java:430) at org.apache.tomcat.loader.AdaptiveServletLoader.loadClass(AdaptiveServletLoader.java:174) at org.apache.tomcat.core.ServletWrapper.loadServlet(ServletWrapper.java:265) at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:289) at org.apache.tomcat.core.Handler.service(Handler.java:254) at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372) at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:797) at org.apache.tomcat.core.ContextManager.service(ContextManager.java:743) at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:210) at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416) at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
解决方案 »
免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货