How to use

PortletNamingContainerUIViewRoot

in

javax.portlet.faces.component

@Override
public void setId(String id) {
  if (BridgeUtil.isPortletRequest()) {
    if (namespace == null) {
      getContainerClientId(FacesContext.getCurrentInstance());
    }
    id = namespace;
  }
  super.setId(id);
}

/**
 * NamingContainer semantics worked generically (serviced by subclasses) as long as the class
 * is marked as implementing NamingContainer and we use the portletNamespace Id as
 * (part of) the component's id.
 */
@Override
public String getContainerClientId(FacesContext context)
{
 if (BridgeUtil.isPortletRequest())
 {
  // Some impls (Facelets don't set an id on the UIViewRoot)  -- Also handles the action case
  if ((this.getId() == null || !this.getId().startsWith(PORTLET_NAMESPACE_ID_PREFIX)))
  {
   setId(this.getId()); // setId can handle the null
  }
  return super.getContainerClientId(context);
 }
 else
 {
  return null;
 }
}

/**
 * Create a new UIComponent subclass, using the mappings defined by previous
 * calls to the addComponent method of this class.
 * <p>
 * @throws FacesException if there is no mapping defined for the specified
 * componentType, or if an instance of the specified type could not be
 * created for any reason.
 */
public javax.faces.component.UIComponent createComponent(String componentType)
    throws FacesException
{
 UIComponent component = mWrapped.createComponent(componentType);
 if (BridgeUtil.isPortletRequest() &&
   component.getClass() == UIViewRoot.class &&
   UIViewRoot.class.getAnnotation(PortletNamingContainer.class) == null
   )
 {
  // replace with our own UIViewRoot
  component = new PortletNamingContainerUIViewRoot();
 }
 return component;
}

/**
 * <p>This method fixes a problem with {@link UIComponent#findComponent(String)} where sometimes it is unable to
 * find components due to incorrect clientId values. For more info, see the following issues:
 *
 * <ul>
 *   <li>http://issues.liferay.com/browse/FACES-198</li>
 *   <li>http://jira.icesoft.org/browse/ICE-6659</li>
 *   <li>http://jira.icesoft.org/browse/ICE-6667</li>
 * </ul>
 * </p>
 */
@Override
public void setId(String id) {
  if (BridgeUtil.isPortletRequest()) {
    super.setId(getContainerClientId(FacesContext.getCurrentInstance()));
  }
}

List<UIComponent> uiViewRootComponentResources = uiViewRoot.getComponentResources(facesContext, "head");
List<UIComponent> uiViewRootStyleSheetResources = null;
List<UIComponent> uiViewRootScriptResources = null;
  uiViewRoot.addComponentResource(facesContext, uiComponentResource, "body");

@Override
public void setId(String id)
{
 if (BridgeUtil.isPortletRequest()) 
 {
  // Turns out that in Facelets the UIViewRoot doesn't seem to have its id set -- i.e. its null
  // So recognize null and change to a uniqueId
  if (id == null)
  {
   id = createUniqueId();
  }
  
  // Turns out some Faces impls (the RI) , on restoreView, manually sets the id from 
  // the extracted state prior to telling the component to restore itself from this state.
  // (At which point the self restore overwrites any id set prior.).  As this manual
  // set is using the already encoded (saved) value we could end up with a doubly
  // encoded id until the restore overwrites.  To avoid this -- first test if
  // its already encoded and don't re-encode.
  if (!id.startsWith(PORTLET_NAMESPACE_ID_PREFIX))
  {
   ExternalContext ec = FacesContext.getCurrentInstance().getExternalContext();
   id = PORTLET_NAMESPACE_ID_PREFIX + ec.encodeNamespace("") + "_" + id;
  }
 }
 super.setId(id);
}

/**
 * <p>This method fixes a problem with {@link UIComponent#findComponent(String)} where sometimes it is unable to
 * find components due to incorrect clientId values. For more info, see the following issues:
 *
 * <ul>
 *   <li>http://issues.liferay.com/browse/FACES-198</li>
 *   <li>http://jira.icesoft.org/browse/ICE-6659</li>
 *   <li>http://jira.icesoft.org/browse/ICE-6667</li>
 * </ul>
 * </p>
 */
@Override
public void setId(String id) {
  if (BridgeUtil.isPortletRequest()) {
    super.setId(getContainerClientId(FacesContext.getCurrentInstance()));
  }
}

List<UIComponent> uiViewRootComponentResources = uiViewRoot.getComponentResources(facesContext, "head");
List<UIComponent> uiViewRootStyleSheetResources = null;
List<UIComponent> uiViewRootScriptResources = null;
  uiViewRoot.addComponentResource(facesContext, uiComponentResource, "body");

String id = viewRoot.getContainerClientId(facesContext);
responseWriter.writeAttribute("id", id, null);

String id = viewRoot.getContainerClientId(facesContext);
responseWriter.writeAttribute("id", id, null);