RE: nested forEach in JSTL, how?

[Marino Tudor]

Hi Shawn

I know that according to the books I have to use
test1.my_StringA (with lowercase) but for some reasons it
does not work in my case.

So, in my class I have
filed my_StringA,
and
method getMy_StringA,

but when I execute my JSP with ${test1.my_StringA} ,
I got an error like:

  javax.servlet.jsp.JspException:
  An error occurred while evaluating custom action attribute "value" with
  value "${test1.my_StringA}":
  Unable to find a value for "my_StringA" in object of
  class "A" using operator "."

The same JSP works OK with  ${test1.My_StringA}.

I know that this is very funny, but why it works with uppercase, and
not with lowercase, as it should, I really don't know.

Regards
Marino Tudor

-----Original Message-----
From: Shawn Bayern [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 18, 2002 3:58 PM
To: Tag Libraries Users List
Subject: Re: nested forEach in JSTL, how?


You have the sense and structure of the loops correct; I believe that
you're just referring to properties with the wrong names.  Without a
BeanInfo class, the method "getMy_StringA()" turns into the property
"my_StringA", not "My_StringA".  (Note the initial lowercase character.)
It's more typical in Java not to include the "_", but this doesn't change
the way that JavaBean accessors are interpreted by the Introspector.

Thus, if you try the following instead, it should work:

 <table>
     <c:forEach var="test1" items="${X}">
        <tr>
          <td><c:out value="${test1.my_StringA}"/></td>
       </tr>
          <c:forEach var="test2" items="${test1[my_List]}">
            <tr>
              <td><c:out value="${test2.my_StringB}"/></td>
            </tr>
          </c:forEach>
      </c:forEach>
  </table>

--
Shawn Bayern
"JSTL in Action"   http://www.jstlbook.com
(coming in July 2002 from Manning Publications)

On Thu, 18 Jul 2002, Marino Tudor wrote:

> I have class A and class B where
> class A hold a Collection of calss B in "My_List".
> ******************************************
> public class A {
>   private String My_StringA;
>   private java.util.List My_List;
>
>    public void setMy_StringA(String param){
>       this.My_StringA = param;
>    }
>    public String getMy_StringA(){
>       return this.My_StringA;
>    }
>
>   public void setMy_List(java.util.List param){
>       this.My_List = param;
>   }
>   public List getMy_List(){
>       return this.My_List;
>   }
> }
> ***************************
> public class B {
>    private String My_StringB;
>    public void setMy_StringB(String param){
>       this.My_StringB = param;
>    }
>    public String getMy_StringB(){
>       return this.My_StringB;
>    }
> }
> ***********************************
>
> Let's say that I have a Collection of class A saved
> in request attribute called "X".
> (request.setAttribute("X", ... collection of classes A);
>
> How can I print out all My_StrigsB for every calss of A using JSTL forEach
?
>
> I tried something like this, but it didn't work:
>
> <table>
>     <c:forEach var="test1" items="${X}">
>        <tr>
>          <td><c:out value="${test1.My_StringA}"/></td>
>       </tr>
>          <c:forEach var="test2" items="${test1[My_List]}">
>            <tr>
>              <td><c:out value="${test2.My_StringB}"/></td>
>            </tr>
>          </c:forEach>
>      </c:forEach>
>  </table>



--
To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>



--
To unsubscribe, e-mail:   <mailto:[EMAIL PROTECTED]>
For additional commands, e-mail: <mailto:[EMAIL PROTECTED]>