Passing a List from Servlet to JSP

Question

When I try to set the value of a list in Servlet to a session variable and access it JSP like,

doGet

HttpSession session = request.getSession(true);
session.setAttribute("MySessionVariable", authorizeUserList);

JSP

<%List lst = session.getAttribute("MySessionVariable");%>

I get an error in JSP as "List cannot be resolved to a type"

So how should I do this? I want to pass a list from Servlet to JSP and populate a Drop down.

[Scriptlets are since a decade discouraged](http://stackoverflow.com/questions/3177733/how-to-avoid-java-code-in-jsp-files/). I recommend to learn taglibs/EL before it's too late. This way you also don't need those `import` statements anymore. — BalusC, Jun 07 '13 at 11:05

score 3 · Accepted Answer · answered Jun 07 '13 at 11:02

3

Are you importing list and casting?

<%@page import="java.util.List"%>
<% List lst = (List) session.getAttribute("MySessionVariable"); %>

answered Jun 07 '13 at 11:02

shyam

score 0 · Answer 2 · answered Jun 07 '13 at 11:03

0

You need to cast it to List as getAttribute return Object type.

answered Jun 07 '13 at 11:03

Harish Kumar

The particular compilation error has completely nothing to do with casting. Whoever upvoted this answer should reconsider the upvote. – BalusC Jun 07 '13 at 11:04
May I know the reason of downvoting it. – Harish Kumar Jun 07 '13 at 11:04
Which compilation error? Shyam has provided same solution as I suggested. – Harish Kumar Jun 07 '13 at 11:05
Are you new to Java? The *"List cannot be resolved to a type"* is a compilation error. You need to import the type. The cast only fixes the new problem which comes thereafter. – BalusC Jun 07 '13 at 11:06
OK got it. I did not see it in terms of compilation like regular java. – Harish Kumar Jun 07 '13 at 11:08
`<% %>` in JSP is precisely regular Java. – BalusC Jun 07 '13 at 11:10
but directly pass list attribute, it will cause a unchecked cast from object to list warning – atom2ueki May 07 '14 at 14:06

2 Answers2