HTTP Status 500 - Unable to compile class for JSP:
type Exception report
message Unable to compile class for JSP:
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 11 in the jsp file: /index.jsp User cannot be resolved to a type 8: <title>Insert title here</title> 9: </head> 10: <body> 11: <jsp:useBean id="user" class="User"></jsp:useBean>
解决办法：
新建class的时候不选择默认的包，而是自己建立一个包
<jsp:useBean id="user" class="demo.User"></jsp:useBean>