UIComponent cannot be found

[dguna]

Hello,

Every page change, I keep getting the following warning. I am sure this is related to CSS loading.

Avertissement:   Unable to save dynamic action with clientId 'j_id345' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id346' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id347' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id348' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id349' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id351' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id352' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id353' because the UIComponent cannot be found
Avertissement:   Unable to save dynamic action with clientId 'j_id350' because the UIComponent cannot be found

My faces-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<faces-config
    xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-facesconfig_2_2.xsd"
    version="2.2">
    <application>
        <resource-handler>org.omnifaces.resourcehandler.CombinedResourceHandler</resource-handler>
</application>

It is not a blocking issue but very annoying. Please somebody shed some light on it.
Thanks in advance.

[stephanrauh]

That's a weird bug already haunting us for a long time. For instance, have a look at #365 (and several other tickets).

It only happens if you're using the CombinedResourceHandler. This removes the CSS files from the JSF tree and replaces them with a new, combined CSS file. For some reason, the JSF engine sometimes recognizes that it has lost one or more file and start complaining.

Most of the time, you can safely ignore the bug. The number of warning increases on each AJAX request, so it's a potential memory and time leak. If you working on a SPA, that might be a problem. Otherwise, it hardly ever gets worse enough to be noticed.

The message only shows in developer mode. Setting the project stage to "production" silences it:

<context-param>
        <param-name>javax.faces.PROJECT_STAGE</param-name>
        <!--param-value>Production</param-value -->
        <param-value>Production</param-value>
</context-param>

[stephanrauh]

Also see #325 and #365.