Cannot cast from Object to boolean

Question

This is the error I am receiving,

org.apache.jasper.JasperException: Unable to compile class for JSP: 

    An error occurred at line: 13 in the jsp file: /index.jsp
    Cannot cast from Object to boolean

This is my code:

Controller Servlet

if(authentication.verifyCredentials(request.getParameter("username"), 
   request.getParameter("password")))
{
        session.setAttribute("username", request.getParameter("username"));
        session.setAttribute("loggedIn", true);
        dispatcher.forward(request, response);   
}

I also tried this,

session.setAttribute("loggedIn", new Boolean(true));

JSP

<% 
    if(session.getAttribute("loggedIn") != null)
    {
        if(((boolean)session.getAttribute("loggedIn")))
        {
            response.sendRedirect("Controller"); 
        }
    }   
%>

Yes I researched and also saw the previous stackoverflow post; however I still cannot resolve my problem. Please assist.

score 23 · Accepted Answer · answered Jun 03 '12 at 20:17

23

Try casting it to Boolean (nullable) instead of boolean in the JSP:

if(((Boolean)session.getAttribute("loggedIn")))
{
    response.sendRedirect("Controller"); 
}

answered Jun 03 '12 at 20:17

ChristopheD

112,638
29
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6

Remember, all the lowercase types are built-in primitive types not extending `Object`. If you want to use them with references, you need to use the uppercase versions, which are "boxed" types. – Wormbo Jun 03 '12 at 20:26
Thank you for handy tip! Onward I can't forget 'Boolean' :) – mumair Oct 22 '15 at 09:00

dantuch · Answer 2 · 2012-06-03T20:21:23.457

8

try with

   if(((Boolean)session.getAttribute("loggedIn")))

instead of:

   if(((boolean)session.getAttribute("loggedIn")))

attribute has to be taken as Boolean, not as primitive type

edited Jun 03 '12 at 20:21

answered Jun 03 '12 at 20:15

dantuch

9,123
6
45
68

Cannot cast from Object to boolean

2 Answers2