java JPA、MySQL和GlassFish crud错误

Question

我正在一个简单的JavaWebServlet netbeans项目中使用JPA、MySQL和GlassFish。可以访问（登录）但列表、编辑、销毁和创建不起作用

"org.apache.jasper.JasperException: java.lang.ClassCastException: model.Person cannot be cast to model.Person"

有时什么都不管用

java.lang.IllegalStateException: This web container has not yet been started 

https://www.dropbox.com/s/isazdnwizxth3lt/WebApplication2.zip?dl=0