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Iterating through local List using JSTL

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posted 15 years ago

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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

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posted 15 years ago

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

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Jigar Naik

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posted 15 years ago

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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

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posted 15 years ago

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Just change this part of your code

Jigar Naik

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posted 15 years ago

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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

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posted 15 years ago

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

Vikas Kapoor

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

Jigar Naik

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

Jigar Naik

Bear Bibeault

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posted 15 years ago

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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?

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Vikas Kapoor

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posted 15 years ago

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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

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

Jigar Naik

Vikas Kapoor

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

Shashank Rudra

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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.

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Jigar Naik

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

Jigar Naik

Shashank Rudra

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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

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Deepali Anand

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posted 15 years ago

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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

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posted 15 years ago

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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

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