JSTL tags where executing?

Hello,
I just started using JSTL tags and I would like to know where they are executed, is it at the browser of the user or at the server? The reason I am asking is that I need to know, if the user do not have Java platform install, he will still have the fuctionality of JSTL tags?
I cannot find this information in any documentation so any help would be great.

good issue.
i also have some doubt about JSTL.
when use write
<form:form name="myForm" command name="Email">
<table>
   <tr>
        <td>
                 <c:out value="${Email.fromId}"/>
        </td>
   </tr>
</table>
</form:form>see if fromId is private member of Email class then also we able use it in the JSP page. according to Java concept we can use private variable with the class scope only.
so how come we are able to use that one in JSP page.
Thanks,
-Ravi.

Similar Messages

Genereting JSTL tags with an XSLT transformation question

Hi there!
I have some XML datas to display in a jsp file.
XML content is of this type:
<message>
<title>A message</title>
</message>
The most elegent way to present them is to transform XML via xslt into xhtml.
(that way I can externally change with ease the message formatting output without changing the jsp)
For that, I use the cool tag
<x:transform>
on each xml file i want to display (with x:foreEach)
The output produced for each xml file is:
<div class="message">
<h2>A message</h2>
</div>
My problem is now that I want to include custom tags in the generated content!
For exemple:
<div class="message">
<h2>A message<c:out ...></h2>
</div>
My question is:
how can I make that xslt generated tag to be executed???
Since it is the product of an xslt transformation ,I suppose it won't be executed at all...
Advices greatly appreciated! :)

I'm not sure I understand what you mean when you say "how can I make that xslt generated tag to be executed???"
You've got your XML input and the XSL-T stylesheet that will transform the XML input into an XHTML stream containing JSTL tags.
I'm assuming that you're going to ask a servlet to pass the XML input to the XSL transformer and get the XHTML output stream. Once you have that, the servlet will write the XHTML to the HTTP response output stream, where it'll be rendered by the browser.
I think the key is to make sure that you tell the browser that response type is a JSP (that's the only document type in which it makes sense to put JSTL tags). When the browser gets that JSP, it'll treat it like any other: generate .java code, compile that to a .class file, and then render.
I'm not sure about efficiency, but it sure is an elegant solution. - MOD

Not able to connect to database(MS SQL Server 2000) through JSTL tag

Hi,
I just want to retrieve some data from the database through a JSP page.I am using JSTL tags the code is as shown below. Whenever i execute this code i get an error message like this
My Code:
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql_rt" %>
<sql:setDataSource var="datasource"
driver="com.microsoft.jdbc.sqlserver.SQLServerDriver"
url="jdbc:mssqlserver:sqlserver://SYS57:1433;DatabaseName= sree"
     user=" "
     password=" "/>
<sql:query var="res" dataSource="${datasource}">
SELECT * FROM books
</sql:query>
<html>
<head>
    <title>A First JSP Database</title>
</head>
<body>
    <table border="1">
      <tr>
        <td>id</td><td>title</td><td>price</td>
      </tr>
      <c:forEach items="${res.rows}" var="row">
      <tr>
        <td><c:out value="${row.id}" /></td>
        <td><c:out value="${row.name}" /></td>
        <td><c:out value="${row.author}" /></td>
      </tr>
      </c:forEach>
    </table>
</body>
</html>error is this:
javax.servlet.ServletException: Unable to get connection, DataSource invalid: "No suitable driver"
     org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:848)
     org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:781)
     org.apache.jsp.firstdb_jsp._jspService(org.apache.jsp.firstdb_jsp:93)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)root cause
javax.servlet.jsp.JspException: Unable to get connection, DataSource invalid: "No suitable driver"
     org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.getConnection(QueryTagSupport.java:308)
     org.apache.taglibs.standard.tag.common.sql.QueryTagSupport.doStartTag(QueryTagSupport.java:192)
     org.apache.jsp.firstdb_jsp._jspx_meth_sql_query_0(org.apache.jsp.firstdb_jsp:132)
     org.apache.jsp.firstdb_jsp._jspService(org.apache.jsp.firstdb_jsp:68)
     org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
     org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322)
     org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
     org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
     javax.servlet.http.HttpServlet.service(HttpServlet.java:802)I am not clear with url attribute of setDatasource tag... I feel the error is because of that line only..... Kindly tell me how to specify the jdbc URL for MS SQL Server 2000 while using JSTL tags for connection.
Thanks,
Akshatha

unable to rectify the error........ tried lot but all in vain...still trying........
my current code is:
<%@ taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%@ taglib prefix="sql" uri="http://java.sun.com/jstl/sql_rt" %>
<sql:setDataSource var="datasource" driver="com.microsoft.jdbc.sqlserver.SQLServerDriver"
url="jdbc:microsoft:sqlserver://SYS57:1433;databaseName=sree" user="sa"
         password="dfgdfg"/>
<sql:query var="res" dataSource="${datasource}">
SELECT * FROM books
</sql:query>
<html>
<head>
    <title>A First JSP Database</title>
</head>
<body>
    <table border="1">
      <tr>
        <td>id</td><td>title</td><td>price</td>
      </tr>
      <c:forEach items="${res.rows}" var="row">
      <tr>
        <td><c:out value="${row.id}" /></td>
        <td><c:out value="${row.name}" /></td>
        <td><c:out value="${row.author}" /></td>
      </tr>
      </c:forEach>
    </table>
</body>
</html>Thanks,
Akshatha

Assigning value derived from a jstl tag to a local variable

Hi
I want to derive a value using a jstl tag then i want to use that value in a scriplet . how do i do that?
Please anyone let me know if this can be done.

JSTL values will be stored in one of the four scopes, page, request, session, or application. By default they go to the page scope.
Page scope corresponds to the pageContext object in scriptlets, so you should try:
Object value = pageContext.getAttribute("varName");
If it is not in the page scope, then:
request scope == request object in scriptlets.
session scope == session object in scriptlets
application scope == servletContext object in scriptlets.
Each of these objects has a getAttribute method that works the same as the pageContext one above.
Or you could use pageContext.findAttribute("varName") to get the value if you don't know where the object is stored.

Posting huge data on to JSP page using JSTL tags

Hi,
I have one application where I have to post huge data (approximately 2000 rows of data) into JSP page. I am using JSTL tags and running on Tomcat 5.
It is taking almost 20 to 25 seconds to load the entire page.
Is it the optimal time to load or it could be improved?
Please let me know.
Thanks,
--Subbu.

Hi Evnafets,
Thank you for the response.
Here are the tasks I am doing to display the data on JSP.
0. We are running on Tomcat 5 and the memory size is 1024MB (1GB).
1. Getting the data - I am not performing any database queries. The data is stored in the static cache memory. So the server side response is so quick - less than a milli second.
2. Using Java beans to pass data to the presentation layer (JSP).
3. 10 'if' conditions and 2 'for' loops and 2 'choose' statements are being used in the JSP page while displaying the data.
4. Along with the above, there are 4 javascript files are being used.
5. The jsp file size after rendering the data, is aprox. 160 kb
Hope this information helps you to understand the problem.
Thanks,
--Subbu.

Are not interpreted JSTL tags in a JSP page including in a servlet.

Hi people,
I have a project where una page (index.jsp) includes a servlet (MyServlet), that consult a persistence class and get a List of objects (Users),
then the servlet passes the List to a Request object and includes another JSP page (showUsers.jsp). And this is conceptually correct, but don´t works, the JSTL tags are not interpreted in showUsers.jsp.
This is my code...
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<c:out value="Show me some things index.jsp"/>
<div style="border-color:red; border:solid; padding-left:60px">
      <jsp:include flush="true" page="pepe/MyServlet"/>
</div>
</body>
</html>...and the Servlet...
public class MyServlet extends HttpServlet
     public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException
          UserManager um = new UserManager();
          List users = um.getUsers(); //This use Hibernate to return a Users List
          request.setAttribute("users", (ArrayList) um.getUsers());
          request.getRequestDispatcher("/showUsers.jsp").forward(request, response);
}...Finally, we have the showUsers.jsp file....
<c:out value="Show me some thing showUsers.jsp"/>
<table>
     <tr>
          <th>ID</th>
          <th>Name</th>
          <th>e-Mail</th>
          <th>Type</th>
     </tr>
     <tr>
          <c:foreach items="${requestScope.users}" var="user">
               <td><c:out value="${user.id}" /></td>
               <td><c:out value="${user.name}" /></td>
               <td><c:out value="${user.email}" /></td>
               <td><c:out value="${user.type}" /></td>
          </c:foreach>
     </tr>
</table>This i get as result page...
ID      Name      e-Mail      TypeFinally, this is the code of showUsers.jsp...
<c:out value="Show me some thing showUsers.jsp"/>
<table>
     <tr>
          <th>ID</th>
          <th>Name</th>
          <th>e-Mail</th>
          <th>Type</th>
     </tr>
     <tr>
          <c:foreach items="[src.User@18f729c, src.User@ad97f5, src.User@d38976, src.User@1e5c339, src.User@17414c8, src.User@7a17]" var="user">
               <td><c:out value="" /></td>
               <td><c:out value="" /></td>
               <td><c:out value="" /></td>
               <td><c:out value="" /></td>
          </c:foreach>
     </tr>
</table>Somebody can help me?
Many thanks,
Gonzalo

Thanks you all guys,
I appreciate very much your help. In response to everyone ...
BalusC wrote:
Is JSTL taglib declared in top of that JSP page? I don't see it back in the posted code snippet. In this example I stuck...
request.getRequestDispatcher("/showUsers.jsp").forward(request, response);By mistake, but this is just a test, the original line of my servlet is...
request.getRequestDispatcher("/showUsers.jsp").include(request, response);As you can see, both (the servlet and the showUser.jsp file) are included in the index.jsp file. So the header...
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>...in the index.jsp file should works (I hope so).
njb7ty wrote:
I assume in your web.xml, you have ''pepe/MyServlet' defined as a servlet tag and servlet map tag? Without that, I don't think your JSP will find the servlet. I'm >not sure you need it in web.xml since I never call a servlet from a JSP page.
I suggest putting System.out.println() throughout your servlet code and out.println() in your JSP pages to see exactly what is called and when.
As a general rule, JSP files are to display data only, and submit back to a servlet. The servlet does all the business logic and dispatches to the appropriate >JSP page. The JSP shouldn't have any business logic. Including the servlet looks kinda like including business logic. Actually, in a MVC design, your >presentation, control, busines, and database layers have their own isolated responsibilities.
I suggest the servlet put data as one java bean in request scope via request.setAttribute() and dispatch to the JSP page. The JSP page gets the data via ><useBean> tag. The JSTL gets the variables from the useBean tag and uses the data from there to display it. Really, this is my web.xml file...
<web-app xmlns="http://java.sun.com/xml/ns/j2ee"
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
     version="2.4">
     <servlet>
          <servlet-name>MyServlet</servlet-name>
          <servlet-class>src.MyServlet</servlet-class>
     </servlet>
     <servlet-mapping>
          <servlet-name>MyServlet</servlet-name>
          <url-pattern>/pepe/MyServlet/*</url-pattern>
     </servlet-mapping>
</web-app>Regarding putting System.out.println() and out.println(), i did it and thats works.
Respect of your last comment, I am not a expert in MVC, but I understand that the view layer can make calls to the Controller layer, I am wrong?
evnafets wrote:
It's not. However thats not code, but the generated HTML.
As Balusc pointed out it's the result of running this JSP page without importing the tag library at the top.
Because the tag library is not declared, it treats the <c:forEach> and other tags as template text, and basically ignores them.
It then evaluates the ${items} attribute as an expression in template text, calling toString() on it.
Cheers,
evnafets      The file showUsers.jsp are included into the index.jsp page, that's have the header taglib. Could this works?
BalusC wrote:
njb7ty wrote:
By the way, I dont think this is the correct format for the foreach tag:
<c:foreach items="[src.User@18f729c, src.User@ad97f5, src.User@d38976, src.User@1e5c339, src.User@17414c8, src.User@7a17]" var="user">You're right friend.
And that's my problem. Any ideas?
Thanks everyone,
Gonzalo

JSTL tags

Where can I find the list of all JSTL tags with description about their functionality?..

What, couldn't wait for a reply to your other post?
Documentation can be found on this very website!
http://java.sun.com/products/jsp/jstl/reference/api/index.html
I would recommend you get hold of the Specification documents. They are very readable, and make an excellent reference. I constantly refer to them.
On the above link,
Maintenance Release = JSTL1.1
Final Release = JSTL1.0
If you are using JSTL1.1/JSP2.0, then the JSP2.0 specification is the source for all things related to the Expression Language (EL)
http://java.sun.com/products/jsp/reference/api/index.html
Cheers,
evnafets

How to write this java code in jsp using jstl tags?

Can anybody help me on this?
I dont know how to check the containsKey using jstl tags?
<%
     LinkedHashMap yearMap     =     (LinkedHashMap)request.getAttribute("yearMap");
     TreeSet nocSet               =     (TreeSet)request.getAttribute("nocSet");
     Iterator     yearMapIt     =     yearMap.keySet().iterator();
     while(yearMapIt.hasNext())
          int yearValue               =     (Integer)yearMapIt.next();
%>
<tr>
          <td><%=yearValue%></td>
<%
          LinkedHashMap monthMap     =     (LinkedHashMap)yearMap.get(yearValue);
          Iterator     nocSetIt     =     nocSet.iterator();
          while(nocSetIt.hasNext())
               String nCase=(String)nocSetIt.next();
               if(monthMap.containsKey(nCase))
                    String count     =     (String)monthMap.get(nCase);
%>
                    <td> <%= count %> </td>
<%           }
               else
%>
                    <td> 0 </td>
<%
%>
</tr>
<% } %>Edited by: avn_venki on Feb 18, 2008 11:54 PM

<c:forEach var="yearMap" items="${requestScope.yearMap}">
     <th> <c:out value="${yearMap.key}"/> </th>
<bean:define id="monthMap" value="${yearMap.value}"/>
<c:forEach var="nocSet" items="${nocSet}">
then how to write containsKey using tags??

How to call the form bean value on jsp withthe help of jstl tag

hi
all friends
i am working in struts & i use jstl tag in jsp. i have one problem rise is how to call the form bean value in jsp page by using jstl tag.
i now how to retrive the value through jsp:logic
eg. <logic:empty name="userListForm" property="users">
NO USER FOUND
</logic:empty>
see * userListForm mean formbaen name.
* users means collection object.
so how can i write above e.g in jstl

You use the jstl core:if or core:choose combined with the EL:
<c:if test="${empty users.userListForm}">
NO USERS FOUND
</c:if>I suggest you lookup the jsp expression language (EL) using google, it's very powerful.

Access JSTL variable outside JSTL tags

hi
I have this jstl tag:
<sql:query var="brands" dataSource="${ds}">
select brand
from carbrand
</sql:query>
i want to manipulate the brands.rowCount without using the <c:set var="count" value="${brands.rowCount}"/>
how can I read the ${brands.rowCount} outside the JSTL
Because I want to use the Math.round, which I think can be use in
<% Math.round(brands.rowCount/3)%>
But I think its not reading the right variable or value?

The variable is put into one of the JSP scope objects. You will be able to access it by using the pageContext.findAttribute("brands") method.
Note: You will have to know the object's type. So look up the API for the sql tag and see what it is.
Note: You will have to use brands.getRowCount() not brands.rowCount.

Problem using JSTL tag libraries with OC4J 9.0.3

Hi
I'm using the JSTL tag libraries with OC4J 9.0.3. I'm using JDeveloper10.1.2. I put the fmt.tld and c.tld in the WEB-INF directory and I'm adding the jstl.jar and standard.jar library to the EAR file. Both tlds have:
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
And OC4J 9.0.3 is compatible with tlib version 1.0 and jsp version 1.2. When I run the web app I get:
OracleJSP: oracle.jsp.parse.JspParseException: Line # 1, <%@ taglib uri="/WEB-INF/fmt.tld" prefix="fmt"%>
Error: oracle.xml.parser.v2.XMLParseException ( /dataSource.jsp ):
line #:1 column #:48 : FIXED type Attribute value not equal to the default value 'http://java.sun.com/xml/ns/j2ee'.
line #:2 column #:18 : Attribute 'xmlns:xsi' used but not declared.
line #:3 column #:19 : Attribute 'xmlns:acme' used but not declared.
line #:4 column #:27 : Attribute 'xsi:schemaLocation' used but not declared.
line #:7 column #:16 : Attribute 'version' used but not declared.
line #:14 column #:15 : Invalid element 'tag-class' in content of 'tag', expected elements '[tagclass]'.
line #:14 column #:15 : Element 'tag-class' used but not declared.
line #:15 column #:18 : Invalid element 'body-content' in content of 'tag', expected elements '[tagclass]'.
line #:15 column #:18 : Element 'body-content' used but not declared.
line #:16 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:18 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
line #:18 column #:12 : Element 'type' used but not declared.
line #:22 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:24 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
line #:24 column #:12 : Element 'type' used but not declared.
line #:28 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:30 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
line #:30 column #:12 : Element 'type' used but not declared.
line #:34 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:36 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
Any ideas?

Hi
Thanks for the reply.
I tried it and I get the same error:
OracleJSP: oracle.jsp.parse.JspParseException: Line # 1, <%@ taglib uri="http://java.sun.com/jstl/fmt" prefix="fmt"%>
Error: oracle.xml.parser.v2.XMLParseException ( /dataSource.jsp ):
line #:1 column #:48 : FIXED type Attribute value not equal to the default value 'http://java.sun.com/xml/ns/j2ee'.
line #:2 column #:18 : Attribute 'xmlns:xsi' used but not declared.
line #:3 column #:19 : Attribute 'xmlns:acme' used but not declared.
line #:4 column #:27 : Attribute 'xsi:schemaLocation' used but not declared.
line #:7 column #:16 : Attribute 'version' used but not declared.
line #:14 column #:15 : Invalid element 'tag-class' in content of 'tag', expected elements '[tagclass]'.
line #:14 column #:15 : Element 'tag-class' used but not declared.
line #:15 column #:18 : Invalid element 'body-content' in content of 'tag', expected elements '[tagclass]'.
line #:15 column #:18 : Element 'body-content' used but not declared.
line #:16 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:18 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
line #:18 column #:12 : Element 'type' used but not declared.
line #:22 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:24 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
line #:24 column #:12 : Element 'type' used but not declared.
line #:28 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:30 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.
line #:30 column #:12 : Element 'type' used but not declared.
line #:34 column #:15 : Invalid element 'attribute' in content of 'tag', expected elements '[tagclass]'.
line #:36 column #:12 : Invalid element 'type' in content of 'attribute', expected elements '[required, rtexprvalue]'.

Cannot use jstl tag for jsp page which generated from Human Task

Hi
Plz help me.
I have tried to using jstl in jsp which generate from Human Task and I deploy it to server( by ant on Jdev ) to see task detail in Oracle Worklist application. But when i submit task and then I access to worklist to see task detail, the error has show in page that "OracleJSP: An error occurred. Consult your application/system administrator for support. Programmers should consider setting the init-param debug_mode to "true" to see the complete exception message. " .
I access server to see application.log to see error and I see error show "workflowform: JspServlet: unable to dispatch to requested page: Exception:oracle.jsp.parse.JspParseException: /Header1.jsp: Line # 3, <%@ taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%> "
How do I fix this error?
PS. I tried to us jstl because I need to connet to database which jstl tag(sql) if somebody has another solution for connect database in task detail page, Please help suggest me.
Thanks
user520932

Is the jstl tag libray loaded in the appsserver?
Can you use jdbc connection like
DataSource ds = ic.lookup("java:comp/env/jdbc/myDB");
Connection con = ds.getConnection();
DataSource ds = (DataSource) org.apache.derby.jdbc.ClientDataSource()
ds.setPort(1521);
ds.setHost("localhost");
ds.setUser("APP")
ds.setPassword("APP");
Connection con = ds.getConnection();
http://java.sun.com/docs/books/tutorial/jdbc/basics/connecting.html

JSP tag in a JSTL tag

Hi all,
i need to pass a dynamic key into a jstl object . how can that be achieved? Below are my codes.
<c:if test="${tableValuesTemp.<%=colName%> == 'functCode'}" >
The code above fails. How can i remedy it?
thanks,
wilson

You cannot use jsp expressions that way in a jstl tag.
You'll have to set the value of the expression as a scoped attribute and then use the square bracket notation in your jstl tag.
<%
pageContext.setAttribute("colName", colName);
%>
<c:if test="${tableValuesTemp[colName] == 'functCode'}" > ram.

Use jstl tags in jsf page

I have h:dataTable in each row of which i'd like to output row data as text, inputfield or link depending on row data type
                    <h:dataTable id="pnlHistory" value="#{UserOrdersBean.orderLineWrappers}" var="wrapper" rendered="#{UserOrdersBean.isBasicUser}"
                                 columnClasses="history_col1, history_col2, history_col3, history_col4, history_col5" width="100%" cellpadding="5" >
                        <h:column>
                            <f:facet name="header">
                                <h:commandLink action="doRefresh" actionListener="#{UserOrdersBean.doSort}">
                                    <h:outputText value="#{msg.userorders_itemName}">
                                        <f:param value="orderLineWrappers"/>
                                        <f:param value="itemName"/>
                                    </h:outputText>
                                </h:commandLink>
                            </f:facet>
                            <h:outputText value="#{wrapper.itemName}" styleClass="itemdescription"/>
                        </h:column>
                        <h:column>
                            <f:facet name="header">
                                <h:commandLink action="doRefresh" actionListener="#{UserOrdersBean.doSort}">
                                    <h:outputText value="#{msg.userorders_data}">
                                        <f:param value="orderLineWrappers"/>
                                        <f:param value="data"/>
                                    </h:outputText>
                                </h:commandLink>
                            </f:facet>
                            <c_rt:choose>
                                <c_rt:when test="#{wrapper.type==0}">
                                    <h:outputText value="#{wrapper.data}" styleClass="basic_thin"/>
                                </c_rt:when>
                                <c_rt:when test="#{wrapper.type==1}">
                                    <h:inputText value="#{wrapper.data}" styleClass="basic_thin" style="width:160px"/>
                                </c_rt:when>
                                <c_rt:when test="#{wrapper.type==2}">
                                    <h:outputLink value="#{wrapper.data}">
                                        <h:outputText value="#{msg.userorders_link}" styleClass="basic_thin"/>
                                    </h:outputLink>
                                </c_rt:when>
                            </c_rt:choose>
                        </h:column>
                     </h:dataTable>trying to use jstl tags but unsuccessfull. Is it ever possible user jstl tags in jsf tags like listed above

Replace the c:choose block by<h:outputText value="#{wrapper.data}" styleClass="basic_thin" rendered="#{wrapper.type == 0}" />
<h:inputText value="#{wrapper.data}" styleClass="basic_thin" style="width:160px" rendered="#{wrapper.type == 1}" />
<h:outputLink value="#{wrapper.data}" rendered="#{wrapper.type == 2}">
    <h:outputText value="#{msg.userorders_link}" styleClass="basic_thin"/>
</h:outputLink>

No EL support in JSTL tags?

I plan to use both JSTL and JSP 2.0 EL in my JSPs. I tried to use an if-tag, with an expression in the test attribute like this:
<c:if test="${!empty sessionScope.userdata}"><h2><mywaf:include name="userinfo"/></h2></c:if>
The JSTL specs show examples like this, i.e. using JSTL and EL together, which is a natural thing as JSTL actually introduced EL. So why does Tomcat give me an error when I access the page:
org.apache.jasper.JasperException: /jsp/en_EN/template.jsp(14,0) According to TLD or attribute directive in tag file, attribute test does not accept any expressions
     org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:83)
     org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:402)
     org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:186)
I looked into the JSTL core tag tld, and indeed, for every single attribute they specify
<rtexprvalue>false</rtexprvalue>
indicating that this is a "runtime attribute".
So what am I doing wrong here?

Okay, I found it:
For reasons not totally obvious there are two versions of each JSTL taglib supplied, one "EL", one "RT":
Excerpt from http://java.sun.com/webservices/docs/1.0/tutorial/doc/JSTL4.html
Twin Libraries
The JSTL tag libraries come in two versions which differ only in the way they support the use of runtime expressions for attribute values.
In the JSTL-RT tag library, expressions are specified in the page's scripting language. This is exactly how things currently work in current tag libraries.
In the JSTL-EL tag library, expressions are specified in the JSTL expression language. An expression is a String literal in the syntax of the EL.
When using the EL tag library you cannot pass a scripting language expression for the value of an attribute. This rule makes it possible to validate the syntax of an expression at translation time.
Well, this confuses me... perhaps I have simply trouble understanding the words....
RT allows me to use the "page's scripting language" (this has to be JSP EL, since there is no other (server sided) scripting language).
EL specifies expressions in EL (which, what wonder, is EXACTLY the same as before?!)
The last part explicitely says, that you cannot pass EL as parameter for JSTL tags using the EL version, but I still do not understand the fundamental difference between EL and RT. Why can't the syntax of an expression be evaluated at translation time when using RT? I mean, in both cases the expression is in the page and won't change anymore.
<scratches head>
I'm confused.

JSTL tags where executing?

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