严重: Servlet.service() for servlet jsp threw exceptionjava.lang.NullPointerException at java.util.Locale.toLowerCase(Locale.java:1060) at java.util.Locale.convertOldISOCodes(Locale.java:1083) at java....
代码写成我这种程度真是不容易，赶紧去烧烧香！！
1.首先出现的错误就是把jar包导入项目后，servlet始终处于报错的状态，index.jsp压根就死在了那里，出不来。
descriptionThe server encountered an internal error () that prevented it from fulfilling this request....
