The correct web.xml should be like this: HelloWorld < Servlet-Class> servlet_demo.helloworld HellowWw servlet_demo.hellowww HelloWorld / helloworld HellowWW / hellowwwww and my web.xml file is this: HelloWorld servlet_demo.helloworld
hellowww servlet_demo.hellowww HelloWorld / HelloWorld
hellowww / hellowwww will be good for a while, the result will be hellowww It's good to make HelloWorld and HellowWW for a while. This low-level error toss me for two days. Later I saw the example of Tomcat 5.5, I understood what happened. Lessons: To learn a technology system, you must read it. However, if you feel confused, don't forget to take a look at the example of your system.
