type Exception report
message An exception occurred processing JSP page /Index.jsp at line 40
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /Index.jsp at line 40
37: %>
38:
39: <%
40: List categories = CategoryService.getInstance().getCategories();
41: List topCategories = getTopCategories(categories);
42: %>
43:
40行错了，没你的代码怎么知道哪里错了。。。