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problem passing a collection object from servlet to jsp

Posted on 2002-03-18
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Last Modified: 2013-11-24
Hi!

I have a problem with regards to passing a collection object from an action servlet to a jsp using struts.
In my perform function I passed a collection object using setAttribute.

Here's a code snippet of my perform function:

    timecardSQL timesql = new timecardSQL(con);
    Collection col = timesql.findAll();
    System.out.println(BeanNames.TIME_LIST);
    req.setAttribute("timeList",  col);
    return mapping.findForward("success");

for my jsp page,      I tried to retrieve it using

<logic:iterate name="timeList" id="columns" scope="request" type="webtm.database.timecard.timecardCOLS">

it produced a "cannot find bean timeList on scope request" error. Why is that?

I can't figure it out so I tried using jsp code

<%
Collection col = (Collection) request.getAttribute("timeList");
if (col == null)
     out.println("null");
else
     out.println("not null");
%>

this time I get a attribute has no value error.

Please help, thanks!

Raymond
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Question by:delphiusr
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8 Comments
 
LVL 9

Expert Comment

by:Venci75
ID: 6879212
because bean and attribute are two different things. Try to declare tomeList with
<jsp:useBean id="tomeList" class="the bean class" scope="request">
0
 

Author Comment

by:delphiusr
ID: 6879238
Could you please re-explain? I'm sorry, but I didn't quite understand what you mean. We were required to use bean:write without using useBean or something
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Author Comment

by:delphiusr
ID: 6879251
Is this what you meant?

<jsp:useBean id="timeList" class="webtm.database.timecard.timecardCOLS" scope="request">

<logic:iterate name="timeList" id="columns" scope="request" type="webtm.database.timecard.timecardCOLS">


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LVL 3

Expert Comment

by:rjackman
ID: 6879287
i think u should refer to struts documentation
it says the name attribute should be assigned a name of bean that holds the collection and not the collection object
instead what u can do is
first get the collection from request object and then pass it to iterate tag
some thing like this
Collection col = (Collection)request.getAttribute("timeList");
and then set the collection field of the iterate tag
ie
<logic:iterate name="col" id="columns" scope="request" type="webtm.database.timecard.timecardCOLS">
I haven't work on struts but from docs i was able to gater this for u
it may work for u give it a try
cheers
RJ

0
 

Author Comment

by:delphiusr
ID: 6881678
Thanks for the replies guys! my groupmate was able to solve it by using session.setAttribute and setting the scope of the logic:iterate to session. I don't know why it doesn't work for request scope though.

Raymond
0
 
LVL 1

Expert Comment

by:Moondancer
ID: 6961507
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Expert Comment

by:Venci75
ID: 7901277
No comment has been added lately, so it's time to clean up this TA.
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