When running the ACE Showcase with MyFaces, any h:graphicImage that doesn't supply an 'alt' attribute generates the following warning:

WARNING: Component UIGraphic j_id1378384490_1a3c8901:image has no attribute alt or attribute resolves to null. Path to component {Component-Path : [Class: javax.faces.component.UIViewRoot,ViewId: /showcase.xhtml][Class: javax.faces.component.html.HtmlBody,Id: _2068169349_6d256d7f][Class: org.icefaces.ace.component.panel.Panel,Id: j_id1803199580_452a22d8][Class: javax.faces.component.html.HtmlPanelGroup,Id: _1803199580_452a228d][Class: javax.faces.component.html.HtmlForm,Id: j_id1378384490_1a3c8901][Class: javax.faces.component.html.HtmlPanelGrid,Id: j_id1378384490_1a3c891b][Class: javax.faces.component.html.HtmlGraphicImage,Id: image]}

This comes from the org.apache.myfaces.shared.renderkit.html.HtmlImageRendererBase:


102 /*
103 * Warn the user if the ALT attribute is missing.
104 */
105 if (uiComponent.getAttributes().get(HTML.ALT_ATTR) == null)
106 {
107 if(!facesContext.isProjectStage(ProjectStage.Development) && log.isLoggable(Level.WARNING))
108 log.warning("Component UIGraphic " + uiComponent.getClientId(facesContext) + " has no attribute alt or attribute resolves to null. Path to component " + RendererUtils.getPathToComponent(uiComponent));
109 }

As you can see it only happens in Production Mode. This may actually be unintended (should be Development mode) and something we can petition them to change. However, I think it likely is intended since the 'alt' attribute is technically a required attribute as per the spec.