Problem: Empty id attribute is not allowed

Hi, I'm a newby with JSF and can't understand how to make some really simple things to work.
One of the problems occurred, when I tried to make a dataTable for choosing locales.
Simple table, like
language code | button "choose"
language code | button "choose"
language code | button "choose"
, and actionListener attached to buttons. The language code is shown by <h:outputText value="${locale}">, works just fine! But when I add <h:commandButton id="${locale}" value="#{msg.set}" actionListener="#{tryoutsView.chooseLocaleAL}"/>, an error appears "Empty id attribute is not allowed"!
So I have two questions about that:
(1) Why ${locale} is normally calculated in one place, and is null nearby? Didn't find any clues on that in official tutorial.
(2) How do I make this work (make id attribute take expression)?
And one more question on related subject
(3) Why did official tutorial authors use "synchronized" mark for method, that determines content of h:dataTable? (http://download.oracle.com/javaee/6/tutorial/doc/bnaty.html#bnauc)
The code:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:f="http://java.sun.com/jsf/core">
    <h:head>
        <title>Facelet Title</title>
    </h:head>
    <h:body>
        Hello from Facelets!
        <f:view>
            <f:loadBundle basename="my.presentation.tryouts" var="msg"/>
            <h:dataTable
                id="locales_table"
                value="#{tryoutsView.supportedLocales}"
                var="locale"
                title="#{msg.thelocales}">
                <f:facet name="header"><h:outputText value="#{msg.tableheader}"/></f:facet>
                <h:column>
                    <f:facet name="column_locale_head"><h:outputText value="#{msg.locale}"/></f:facet>
                    <h:outputText value="${locale}"/>
                </h:column>
                <h:column>
                    <h:form>
                        <h:commandButton id="${locale}" value="#{msg.set}" actionListener="#{tryoutsView.chooseLocaleAL}"/>
                    </h:form>
                </h:column>
                <f:facet name="footer"><h:outputText value="#{msg.tablefooter}"/></f:facet>
            </h:dataTable>
        </f:view>
    </h:body>
</html>
public class TryoutsView {
    private static final TreeMap<String, Locale> SUPPORTED_LOCALES = MyUtils.iterator2treemap(FacesContext.getCurrentInstance().getApplication().getSupportedLocales());
    public synchronized List<String> getSupportedLocales() {
        List<String> l = MyUtils.iterator2arrlist(SUPPORTED_LOCALES.keySet().iterator());
        return l;
}Edited by: 800060 on Oct 4, 2010 10:23 PM
Edited by: 800060 on Oct 5, 2010 12:18 AM

If you have/intend nothing useful to say, then, please, stop trashing the thread.I don't consider asking questions, or pointing out tautologies, to be 'trashing the thread'.
(1) Why ${locale} is normally calculated in one place, and is null nearby? It isn't 'calculated' anywhere in your code. It is set by the listbox. Until the user selects a value it doesn't have one. It iis empty. Hence the error message that I keep directing your attention to.
(2) How do I make this work (make id attribute take expression)?Make sure the value of the expression isn't empty.
And one more question on related subject
(3) Why did official tutorial authors use "synchronized" mark for method, that determines content of h:dataTable? (http://download.oracle.com/javaee/6/tutorial/doc/bnaty.html#bnauc)
Because 'items' is probably not thread-safe.
If you want any further help from me I suggest you mind your manners. It is clear that you have very little useful to say here. You seem to have no intention of answering any of the questions I asked you. Nor am I convinced that you understand the difference between 'empty' and 'omitted' that I have been trying to get you to see. It is impossible to help those who will not help themselves, and abusing those who are trying to help them is not a rational policy.

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