Tomcat或者Jetty版本太低:https://www.cnblogs.com/NyanKoSenSei/p/11427179.html
解决办法:
https://blog.csdn.net/wulongren520qian/article/details/80225567
JSP编译错误无法显示:PWC6033: Unable to compile class for JSP
原文:https://www.cnblogs.com/2008nmj/p/14760746.html