Using JSTL to iterate

hi
i have a Value Object which consists of a vector as one of its attribute.
This vector in turns consists of another Value Object called ParamVO.
This ParamVO consists of ParamName and ParamValue.
I would like to iterate this vector using JSTL.
However I am unable to display the values in ParamVO.
My codes look like this:
<c:forEach items="<%=myVector%>" var="$ParamVO">
<tr>
<td><c:out value="${ParamVO.ParamName}"/></td>
</tr>
</c:forEach>
pls advice. Thanks !

Hi duffymo
thanks for your reply. I have tried out your codes, however I get this error instead.
javax.servlet.jsp.JspException: An error occurred while evaluating custom action attribute "value" with value "${ParamVO.ParamName}": Unable to find a value for "ParamName" in object of class "java.lang.String" using operator "." (null)
     at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:146)
     at org.apache.taglibs.standard.lang.jstl.Evaluator.evaluate(Evaluator.java:166)
     at org.apache.taglibs.standard.lang.support.ExpressionEvaluatorManager.evaluate(ExpressionEvaluatorManager.java:112)
     at org.apache.taglibs.standard.tag.el.core.ExpressionUtil.evalNotNull(ExpressionUtil.java:85)
     at org.apache.taglibs.standard.tag.el.core.OutTag.evaluateExpressions(OutTag.java:137)
     at org.apache.taglibs.standard.tag.el.core.OutTag.doStartTag(OutTag.java:95)
     at jsp_servlet._omp._evs._assigncv.__displaycapacity._jspService(__displaycapacity.java:552)
     at weblogic.servlet.jsp.JspBase.service(JspBase.java:33)
     at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:431)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
     at weblogic.servlet.internal.RequestDispatcherImpl$ForwardAction.run(RequestDispatcherImpl.java:342)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:97)
     at weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImpl.java:246)
     at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1058)
     at org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:451)
     at org.apache.struts.action.RequestProcessor.processActionForward(RequestProcessor.java:401)
     at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:279)
     at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1420)
     at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:502)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(ServletStubImpl.java:1053)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:387)
     at weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java:305)
     at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6291)
     at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:317)
     at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:97)
     at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3575)
     at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2573)
     at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:178)
     at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:151)

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* To change this template, choose Tools | Templates
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38:
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Example:
This Works:
<fmt:set var="test" value="JSTL" />
<fmt:out value="${test}" />
But, this gives error:
<% out.println(test) %>
And passing the value of variable 'test' to Java Script code also gives error.
How to use JSTL variables in JSP and in Javascript ?
Yours,
Sankar.B

By default, JSTL variables are kept in servlet
attributes. Default is to store it in the page
context. You can make it request/session/application
scope as required by an attribute of the set tag.Hi there,
Can anyone advise how to access JSP variables in JSTL?
Can it be done as the same method through request/session/application scope?
Thnks...

Displaying a set of records using jstl

hi i am new to jstl.my requirement is i want to display a set of records from my database using jstl.for eg i want to display 50 records per page and i want to navigate to other records using next and prevoius buttons and i need to put view and edit buttons in that page.can anybody give me a solution for this.urgent

You may try the paging taglib ...
http://www.servletsuite.com/servlets/pagertag.htm

JSP Worked Well Using Scripting Elements, But, Becomes a Null Using JSTL

I have to bother all of you again with my JSTL problems. I am working on a JSP, which is very similar to the one that caused a lengthy discussion on this forum before. This JSP is a bit more complicated.
Again, this JSP worked well and displayed what I expected when the page was coded using the scripting elements.
I tried to use JSTL where possible and managed to correct all the compilation errors.
Now, I got a simple message: 'null' in the browser without any explanation - typical problem working with JSP: very difficult to debug.
I have tried to identify problems "one by one" and found the first encounter is where I want to set the background color for each row inside the <c:forEach ....> tag.
I examined the code again and again, I could not see what would lead to 'null'. I need a hand again.
<%@ taglib uri="/tags/struts-html-el" prefix="html" %>
<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<%@ taglib uri="/tags/tiles" prefix="tiles" %>
<%@ taglib uri="/tags/request" prefix="req" %>
<%@ taglib uri="/WEB-INF/c.tld" prefix="c" %>
<%@ page import="org.apache.artimus.message.utility.ParamUtil" %>
<%@ page import="org.apache.artimus.message.exceptions.AssertionException" %>
<%@ page import="org.apache.artimus.authorization.OnlineUser" %>
<%@ page import="org.apache.artimus.authorization.OnlineUserImpl" %>
<%@ page import="org.apache.artimus.filter.EnableEmotionFilter" %>
<%@ page import="org.apache.artimus.message.ThreadBean" %>
<%@ page import="org.apache.artimus.message.PostBean" %>
<%@ page import="org.apache.artimus.message.AttachmentBean" %>
<%@ page import="org.apache.artimus.MessageInboxConfig" %>
<%@ page import="org.apache.artimus.WebSiteGlobal" %>
<%@ page import="org.apache.artimus.SiteUtil" %>
<c:set var="threadBean" value="${requestScope.ThreadBean}" />
<c:set var="postRows" value="${requestScope.PostBeans}" />
<c:set var="numberOfPosts" value="${requestScope.NumberOfPosts}" />
<c:set var="previousTopic" value="${requestScope.PreviousTopic}" />
<c:set var="nextTopic" value="${requestScope.NextTopic}" />
<c:set var="offset" value="${requestScope.offset}" />
<c:set var="threadID_int" value="${requestScope.thread}" />
<c:if test="${threadBean.threadID != threadID_int}">
    The two threadID are not the same.
</c:if>
<c:set var="threadID" value="${threadID_int}" />
<%-- the code before this line works fine and I have a number of things displayed as expected --%>
<c:forEach var="postBean" items="{postRows}" varStatus="i">
<% PostBean postBean =
   ( PostBean )pageContext.getAttribute( "postBean" );
%>
   <c:choose>
      <c:when test="${(postBean.parentPostID) eq 0}">
         <c:set var="background" value="#FFCE9C" />
      </c:when>
      <c:otherwise>
         <c:choose>
            <c:when test="${(i+1)%2 ne 0}">
               <c:set var="background" value="#EEEEEE" />
            </c:when>
            <c:otherwise>
               <c:set var="background" value="#FFFFFF" />
            </c:otherwise>
         </c:choose>
      </c:otherwise>
   </c:choose>
<table width="95%" border="0" cellspacing="1" cellpadding="5" align="center" bgcolor="#999999">
<tr bgColor="${background}">
</tr>
</table>
</c:forEach>

Where is the null occuring? Have you looked at the returned HTML code to see where the 'null' is?
You might try just a few <c:out value=""/>, like:
The postRows = <c:out value="${postRows"/><br/>
<c:forEach var="postBean" items="${postRows"/>
The Current postBean = <c:out value="${postBean}"/><br/>
The Current parentPostID = <c:out value="${postBean.parentPostID eq 0}"/><br/>

<c:set var="background" value="#FFFFFF"/>
<c:choose>
    <c:when test="${postBean.parentPostID eq 0}">
      <c:set var="background" value="#FFCE9C"/>
    </c:when>
    <c:when test="${(i+1)%2 ne 0}">
      <c:set var="background" value="#EEEEEE"/>
    </c:when>
    <c:otherwise>
      <c:set var="background" value="#FFFFFF"/>
    </c:otherwise>
</c:choose>
The Background is now = <c:out value="${background}"/><br/>
<table width="95%" border="0" cellspacing="1" cellpadding="5" align="center" bgcolor="#999999">
    <tr bgColor="${background}">
    </tr>
</table>
</c:forEach>By adding output like that when we are debugging we can help track down where problems that occur are coming from. That and looking at the source code have been invaluable to me...

Using JSTL to iterate

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