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Editorial Team
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Asked: 2026-06-04T23:48:43+00:00

Here is my xhtml page: <!DOCTYPE html> <html xmlns=http://www.w3.org/1999/xhtml xmlns:h=http://java.sun.com/jsf/html xmlns:ui=http://java.sun.com/jsf/facelets xmlns:f=http://java.sun.com/jsf/core> <h:head> <title>Index</title>

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Here is my xhtml page:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
    xmlns:h="http://java.sun.com/jsf/html"
    xmlns:ui="http://java.sun.com/jsf/facelets"
    xmlns:f="http://java.sun.com/jsf/core">
<h:head>
    <title>Index</title>
    <style>
.error {
    background-color: #fdd;
}
</style>
</h:head>
<h:body>
    <h:messages style="color: orange" />
    <h:form>
        <h:inputText value="#{myBacking.um}" required="true" />
        <h:commandButton value="Submit" action="#{myBacking.acme}" />
    </h:form>
</h:body>
</html>

I tested with mojarra 2.0.9 and mojarra 2.1.8, and both doesn’t generate an id for the h:inputText component.
Is it a bug in JSF?

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1 Answer

  1. Editorial Team

    Mojarra will only set the ID if the enduser has specified it by itself or if the component has client behaviors specified (by <f:ajax>).

    Here’s an extract of relevance of the HtmlBasicRenderer source code:

    protected String writeIdAttributeIfNecessary(FacesContext context, ResponseWriter writer, UIComponent component) {
    String id = null;
    if (shouldWriteIdAttribute(component)) {
        try {
            writer.writeAttribute("id", id = component.getClientId(context), "id");
        } catch (IOException e) {
            if (logger.isLoggable(Level.WARNING)) {
                String message = MessageUtils.getExceptionMessageString (MessageUtils.CANT_WRITE_ID_ATTRIBUTE_ERROR_MESSAGE_ID, e.getMessage());
                logger.warning(message);
            }
        }
    }
    return id;
}

    And, note the comments

    protected boolean shouldWriteIdAttribute(UIComponent component) {

    // By default we only write the id attribute if:
    //
    // - We have a non-auto-generated id, or...
    // - We have client behaviors.
    //
    // We assume that if client behaviors are present, they
    // may need access to the id (AjaxBehavior certainly does).

    String id;
    return (null != (id = component.getId()) &&
                (!id.startsWith(UIViewRoot.UNIQUE_ID_PREFIX) ||
                    ((component instanceof ClientBehaviorHolder) &&
                      !((ClientBehaviorHolder)component).getClientBehaviors().isEmpty())));
}

    So, that’s expected behavior.

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