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Need help understanding using data types with session.setAttribute & session.getAttribute

Posted on 2004-08-27
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Last Modified: 2010-04-01
I'm learning jsp slowly and painfully so please forgive my newbie question...

In one page I'm trying to set a session variable.  The second line here blows up.

    '<% char schoolMode=''a'';
    session.setAttribute("schMode", schMode); %>

And in another I try to access the variable and it blows up as well.
    <% char  schMode=(char)session.getAttribute("schMode"); %>


Thanks a bunch.  
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Question by:padmasambhava
6 Comments
 
LVL 19

Expert Comment

by:ramazanyich
ID: 11919686
It is a typo in your session.setAttribute. It should be
session.setAttribute("schMode",schoolMode);
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LVL 13

Expert Comment

by:Murali Murugesan
ID: 11920649
IT IS

  '<% char schoolMode=''a'';
    session.setAttribute("schMode", schoolMode); %>
OR simply
<%    session.setAttribute("schMode","a");%>

TO ACCESS FIRST/second ONE ,

    <% String  schMode=session.getAttribute("schMode").toString(); %>


-Murali*
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Author Comment

by:padmasambhava
ID: 11920935
Is there a way to store a char value in the session?  I will be going directly into a switch statement, which if I understand correctly only works with char or byte values.  

How do I store the various data types in the session?  It seems klunky to convert everything to string and back.

Thanks
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LVL 27

Accepted Solution

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rrz earned 100 total points
ID: 11921216
><% char schoolMode=''a'';
    session.setAttribute("schMode", schMode); %>
You need to box up that primitive( In java 1.5 will be done automatically).
<% char schoolMode=''a'';
    session.setAttribute("schMode", new Character(schoolMode)); %>


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LVL 49

Expert Comment

by:Ryan Chong
ID: 11921226
Session should able to store Objects by default.

You may need to check the type of object store before you do the conversion.

use:

session.getAttribute("myobject").getClass()
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LVL 27

Expert Comment

by:rrz
ID: 11921232
><% char  schMode=(char)session.getAttribute("schMode"); %>  
and you must un-box  (which will done automatically in java 1.5).
<% char  schMode=((Character)session.getAttribute("schMode")).charValue(); %>
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