Forum:

Iterating through local List using JSTL

Ranch Hand

Posts: 763

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Hi i have once jstl in which i have created java.util.List and adding three element.

And now when i am trying to iterate through the list using jstl forEach loop, i am not able to retrive any element.

Bellow is the complete code .jsp file, Help me out solving this issue.

Regards,

Jigar Naik

Bear Bibeault

Sheriff

Posts: 67747

173

I like...

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

At what point do you create a scoped variable named list? (Answer: you don't.)

[Asking smart questions] [About Bear] [Books by Bear]

HTML 5 (verified skill)
Skill verified by Jeanne Boyarsky

CSS 3 (verified skill)
Skill verified by Jeanne Boyarsky

JavaScript (verified skill)
Skill verified by Jeanne Boyarsky

Jigar Naik

Ranch Hand

Posts: 763

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

line no 17 is not required anymore i just added it for testing whether the EL is working fine or not

Line 25 in items i m getting the list which is of type java.util.List items="${list }">

and assisgnig it to variable listItems for iteration var="listItems"

Jigar Naik

saumil baxi

Ranch Hand

Posts: 58

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Just change this part of your code

Jigar Naik

Ranch Hand

Posts: 763

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

yeah i have changed it

new code

and the bellow is the output in browser

Welcome to JSTL

--------------------------------------------------------------------------------
List Size : 3

Jigar Naik

Vikas Kapoor

Ranch Hand

Posts: 1374

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

And take a look at the For loop (JSTL).

Vikas Kapoor

Ranch Hand

Posts: 1374

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

What is the scope List list?
Where it will look for list?

Jigar Naik

Ranch Hand

Posts: 763

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

list is an local variable i am just creating it before iterating

Jigar Naik

Bear Bibeault

Sheriff

Posts: 67747

173

I like...

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Why would you expect the JSTL/EL, which are meant to replace scriptlets to know anything about scripting variables?

It doesn't.

You need to create a scoped variable for the EL to be able to access the data.

I assumed that the scriptlet code was in this JSP for testing purposes only. You wouldn't really put scriptlets in a JSP, would you?

[Asking smart questions] [About Bear] [Books by Bear]

Vikas Kapoor

Ranch Hand

Posts: 1374

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Jigar, you don't see the desired output because list is out of scope for the loop.
Try putting List list into request and see what happens?

And take in account Bear's advice. Don't use Scriplets.

Jigar Naik

Ranch Hand

Posts: 763

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

yup i won't use scriptlets anymore.. but it worked with request scope... i was trying an example...

Jigar Naik

Vikas Kapoor

Ranch Hand

Posts: 1374

posted 15 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Jigar Naik wrote:yup i won't use scriptlets anymore.. but it worked with request scope... i was trying an example...

Shashank Rudra

Ranch Hand

Posts: 131

posted 14 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Naik

yup i won't use scriptlets anymore.. but it worked with request scope... i was trying an example..

Here you have used the scope to access/iterate the List - would you please post the code you used.

I am trying to set it using (I dun know how to do it using JSTL tags

)and then trying to access it on the same page as well as some other forwarded page(on submit of a form)But that is not helping. And I am getting this error -the mysterious and cryptic error. Thanks in advance.

Programmer Analyst || J2EE web development/design

Jigar Naik

Ranch Hand

Posts: 763

posted 14 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

<c:forEach var="ntry" value="${requestScope.strList}"> <c:out value="${ntry}" /> </c:forEach>

Jigar Naik

Shashank Rudra

Ranch Hand

Posts: 131

posted 14 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Thanks Naik for the quick response. But still I am helpless. here are the jsps that I am trying to test this on

The first JSPHere I am setting the request parameter and then submitting to the testList.jsp where I am trying to access the List entries.
testList.jspBut this is getting me this error

javax.servlet.ServletException: javax/el/ValueExpression
	org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
	org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
	org.apache.jsp.jsp.testList_jsp._jspService(testList_jsp.java:90)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

root cause

java.lang.NoClassDefFoundError: javax/el/ValueExpression
	org.apache.taglibs.standard.tag.common.core.ForEachSupport.prepare(ForEachSupport.java:179)
	javax.servlet.jsp.jstl.core.LoopTagSupport.doStartTag(Unknown Source)
	org.apache.jsp.jsp.testList_jsp._jspx_meth_c_forEach_0(testList_jsp.java:109)
	org.apache.jsp.jsp.testList_jsp._jspService(testList_jsp.java:64)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

Please tell me where I am going haywire. TIA

Programmer Analyst || J2EE web development/design

Deepali Anand

Greenhorn

Posts: 12

posted 14 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Giffy Geraldo wrote:Thanks Naik for the quick response. But still I am helpless. here are the jsps that I am trying to test this on

The first JSP<body bgcolor=lightblue> <% List<String> strList = new ArrayList<String>(); strList.add("Test1");strList.add("Test2");strList.add("Test3"); request.setAttribute("strList",strList); %> <form method=post action="testList.jsp"> NAME <input type=text name="text1"><br> PLACE<input type=text name="text2"><br> <input type=submit> </form> </body>Here I am setting the request parameter and then submitting to the testList.jsp where I am trying to access the List entries.
testList.jsp<body bgcolor=green> <c:forEach var="ntry" items="${requestScope.strList}"> <c:out value="${ntry}" /> </c:forEach> <br/> <br/> <br/> NAME:<c:out value="${params.text1}"/><br> PLACE:<c:out value="${params.text2}"/> </body>

Hello,

You have used ${params} ...
It should be ${param}

Hope, this solves your problem.

-Deepali

SCJP 1.5, SCWCD 5

Shashank Rudra

Ranch Hand

Posts: 131

posted 14 years ago

Number of slices to send:

Optional 'thank-you' note:

Send

Thanks Deepali. That worked. Actually I reposted it with slightly different iteration as other thread
https://coderanch.com/t/450213/JSP/java/using-JSTL-EL-get-set

Programmer Analyst || J2EE web development/design

"To do good, you actually have to do something." -- Yvon Chouinard

a bit of art, as a gift, that will fit in a stocking

https://gardener-gift.com