JSF and JSTL integration

Question

Can anyone tell me how to access JSF objects from JSTL tags?
I want to set a requestScope flag in my changeListener
... context.getExternalContext().getRequestMap().put("xxx","ok"); ... and render output depending on existance of this flag:
...<c:if test="${requestScope.xxx!=null}" > .... .
This examplecode doesn't work, JSTL tags cannot access this var! How can I do that?
What I realy want is to reload another frame when user changed a specific input field.
Above code should add a JavaScript to reload the frame if this is true .
I can't do this on submit because the other framepage uses the stored/modified data.
Maybe there's a better approach for this anyway?
Thanks for your help!

Answer 1

Thanks for your help - I found it was my own mistake why it didn't work. Now it does, as you said.
But in the meentime I ran into another Problem mixing JSTL und JSF:
I want to build a SelectOneMenu and populate it with data from a database, but with selectItemValue
other than selectItemLabel (value should be numeric DB-ID, label a readable name).
Since "selectItems" allows only one dimensional Arrays (?) as parameter, I must use "selectItem" for
each row. So I wrote following code:
<h:selectOneMenu id="m1" value="#{worktime.employee}">
   <sql:query var="employees" dataSource="jdbc/WebOfficeDB">
       select oid,displayname from employees order by displayname asc
    </sql:query>
    <c:forEach var="row" items="${employees.rows}" >
       <f:selectItem itemValue="#{row.oid}" itemLabel="#{row.displayname}" />
    </c:forEach>
</h:selectOneMenu>This doesn't work, I get NullPointer Exceptions from selectItem.setValue().
I think because JSF "#" references another context than JSTL "$" - is this correct?
So I tried to set a JSTL variable inside the forEach loop to access the datarow
<c:set var="data" value="${row}" scope="request"/>
<f:selectItem itemValue="#{requestScope.data.oid}" itemLabel="#{requestScope.data.displayname}" />
...The effect is that all lines of the selectOneMenu have the same content (from the last datarecord)!?
Since this is my first project in JSTL and JSF and should stay a small one I don't want to go into building
CustomComponents and so on for such a simple Task.
I would be very very happy for some tips and hints, since I think this mixing of JSTL and JSF Context
will be a very common problem within my project.
Thanks