Servlet学习中……

Tomcat报错：FAIL - Application at context path /HelloWorld could not be started 

     FAIL - Encountered exception org.apache.catalina.LifecycleException: Failed to start component                               [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/HelloWorld]]

解决办法：web.xml里面：<url-pattern>/*</url-pattern>少写一个“/”