go to the plugins UI page (Administration>Plugins).

Upload a plugin (any plugin, even one that already exists).

The <h:messages> component at the top should re-render to show you the messages to tell you what was uploaded.

The messages never show up.

Why doesn't this work?

plugin-list.xhtml:

<h:messages id="pluginsmessages"
...
        <rich:fileUpload
            ...
            <a4j:support event="onuploadcomplete" reRender="pluginsmessages" />

InstalledPluginsUIBean.java:

    public void fileUploadListener(UploadEvent event) {
    ...
            FacesContextUtility.addMessage(FacesMessage.SEVERITY_INFO, "New agent plugin uploaded: " + agentPlugin);
    ...