JSP BEAN RETRIEVAL

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Vittorix - 09 Mar 2008 23:37 GMT

Again, I try to explain in a simpler way:

in a JSP page:

<%
String bookBeanBeg;
bookBeanBeg = "bookBeanBeg1";
%>

<jsp:useBean id="<%=bookBeanBeg%>"
type="p4Solution.BookBean" scope="session" />
<jsp:getProperty name="<%=bookBeanBeg%>"
property="shortDescription"/>

it doesn't work.

please help to make it work. I'm going crazy with it!

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ciao
Vittorix

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Vittorix - 10 Mar 2008 17:30 GMT

> in a JSP page:
>
[quoted text clipped - 9 lines]
>
> it doesn't work.

this could be helpful for somebody in the future, then I post it here:

because I couldn't find a solution, I'm using a scriplet inside the JSP that
does the job:

int numBooks = Integer.parseInt(request.getParameter("numBook"));
for (int i=1; i<=numBooks; i++)
{
String bookBeanS = "bookBeanBeg" + i + "";
p4Solution.BookBean bookBean = null;
bookBean = (p4Solution.BookBean) session.getAttribute(bookBeanS);
out.write(bookBean.getSeq_no());
}

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ciao
Vittorix

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Arne Vajhøj - 11 Mar 2008 02:07 GMT

> this could be helpful for somebody in the future, then I post it here:
>
[quoted text clipped - 9 lines]
> out.write(bookBean.getSeq_no());
> }

JSP pages with scriptlets with out.print/write should not
be able to pass code review.

Arne

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Vittorix - 11 Mar 2008 04:04 GMT

>> because I couldn't find a solution, I'm using a scriplet inside the
>> JSP that does the job:
[quoted text clipped - 10 lines]
> JSP pages with scriptlets with out.print/write should not
> be able to pass code review.

what do you mean? it works great

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ciao
Vittorix

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Lew - 11 Mar 2008 05:54 GMT

> Arne Vajh�j wrote:
>
[quoted text clipped - 13 lines]
>
> what do you mean? it works great

He means that the presence of scriptlet in a JSP is a "bad" mark in a code
review. It presents maintenance difficulties, and obviates the natural
separation of view artifacts from logic artifacts. It also represents that
you left a bug unfixed, in that the <c:forEach> idiom should work, so from an
organizational standpoint that remains an open issue.

I have known a few people who had Marty Hall as a teacher. He took off ten
points from an assignment submission for each line of scriptlet in a JSP.
<http://www.apl.jhu.edu/~hall/>

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Lew

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Vittorix - 11 Mar 2008 16:09 GMT

>> what do you mean? it works great
>
> He means that the presence of scriptlet in a JSP is a "bad" mark in a
> code review. It presents maintenance difficulties, and obviates the
> natural separation of view artifacts from logic artifacts.

right. but I didn't find a solution, what I gotta do?

> It also
> represents that you left a bug unfixed, in that the <c:forEach> idiom
> should work, so from an organizational standpoint that remains an
> open issue.

I agree. what do you suggest?

> I have known a few people who had Marty Hall as a teacher. He took
> off ten points from an assignment submission for each line of
> scriptlet in a JSP. http://www.apl.jhu.edu/~hall/

too bad that he wants us to buy the second volume of his book to tell us how
a <c:forEach>. works...

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ciao
Vittorix

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Lew - 12 Mar 2008 01:25 GMT

Lew wrote:

>> I have known a few people who had Marty Hall as a teacher. He took
>> off ten points from an assignment submission for each line of
>> scriptlet in a JSP. http://www.apl.jhu.edu/~hall/

> too bad that he wants us to buy the second volume of his book to tell us how
> a <c:forEach>. works...

It is my observation that Professor Hall is mighty good at promoting himself
and his products.

You can get an overview of the JSTL tags for free in the Sun Java EE tutorial.
<c:forEach> is covered in:
<http://java.sun.com/javaee/5/docs/tutorial/doc/bnakh.html#bnakm>

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Lew

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Vittorix - 12 Mar 2008 03:11 GMT

>>> I have known a few people who had Marty Hall as a teacher. He took
>>> off ten points from an assignment submission for each line of
>>> scriptlet in a JSP. http://www.apl.jhu.edu/~hall/

>> too bad that he wants us to buy the second volume of his book to
>> tell us how a <c:forEach>. works...

> It is my observation that Professor Hall is mighty good at promoting
> himself and his products.

and I reinforced it :)
however, his book is decent and the first volume is online for free.

> You can get an overview of the JSTL tags for free in the Sun Java EE
> tutorial. <c:forEach> is covered in:
> <http://java.sun.com/javaee/5/docs/tutorial/doc/bnakh.html#bnakm>

thanks, I don't know why I tried the approach and nothing is shown in the
page.
I posted the code on another thread, if you like to see it.

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ciao
Vittorix

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JSP BEAN RETRIEVAL

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