How to extend f:view

Question

I require to extend f:view to add certain client specific attributes later on.
the basic extension of f:view is not working. here is what i did
public class ViewTag extends UIComponentTag {
private String locale;
* @see javax.faces.webapp.UIComponentTag#setProperties
* (javax.faces.component.UIComponent)
protected void setProperties(UIComponent component) {
/* You have to call the super class */
super.setProperties(component);
((ViewComponent) component).setLocale(locale);
* @see javax.faces.webapp.UIComponentTag#getComponentType()
public String getComponentType() {
return "f.view";
* @see javax.faces.webapp.UIComponentTag#getRendererType()
public String getRendererType() {
return "f.view";
* @return Returns the locale.
public String getLocale() {
return locale;
* @param locale
* The locale to set.
public void setLocale(String locale) {
this.locale = locale;
=======================================================public class ViewComponent extends UINamingContainer {
private static final Log log = LogFactory.getLog(ViewComponent.class);
private String locale;
public Object saveState(FacesContext context) {
Object values[] = new Object[2];
values[0] = super.saveState(context);
values[1] = locale;
return ((Object) (values));
public void restoreState(FacesContext context, Object state) {
Object values[] = (Object[]) state;
super.restoreState(context, values[0]);
locale = (String) values[1];
* @see javax.faces.webapp.UIComponentTag#getComponentType()
public String getFamily() {
return "f.view";
* @return Returns the locale.
public String getLocale() {
return locale;
* @param locale The locale to set.
public void setLocale(String locale) {
this.locale = locale;
public void encodeEnd(FacesContext context) throws IOException {
return;
public void decode(FacesContext context) {
return;
======================================================
public class ViewRenderer extends Renderer {
private static final Log log = LogFactory.getLog(ViewRenderer.class);
public Object getConvertedValue(FacesContext facesContext,
UIComponent component, Object submittedValue)
throws ConverterException {
return super.getConvertedValue(facesContext, component, submittedValue);
public void decode(FacesContext context, UIComponent component) {
/* Grab the request map from the external context */
Map requestMap = context.getExternalContext().getRequestParameterMap();
/* Get client ID, use client ID to grab value from parameters */
String clientId = component.getClientId(context);
String value = (String) requestMap.get(clientId);
ViewComponent viewComponent = (ViewComponent) component;
public void encodeBegin(FacesContext context, UIComponent component)
throws IOException {
ViewComponent viewComponent = (ViewComponent) component;
ResponseWriter writer = context.getResponseWriter();
encodeLocale(writer, viewComponent);
encodeMessage(context, writer, viewComponent);
writer.flush();
private void encodeMessage(FacesContext context, ResponseWriter writer,
ViewComponent viewComponent) throws IOException {
Iterator iter = context.getMessages(viewComponent.getClientId(context));
while (iter.hasNext()) {
FacesMessage message = (FacesMessage) iter.next();
writer.write(message.getDetail());
private void encodeLocale(ResponseWriter writer, ViewComponent viewComponent)
throws IOException {
writer.startElement("locale", viewComponent);
writer.write("" + viewComponent.getLocale());
writer.endElement("locale");
public String getFamily() {
return "f.view";
=======================================================
f.tld
<tag>
          <name>view</name>
          <tag-class>com.test.jsfcomponents.view.ViewTag</tag-class>
          <body-content>JSP</body-content>
          <attribute>
               <name>locale</name>
               <required>false</required>
          </attribute>
     </tag>
====================================================
faces-config
component>
          <component-type>cvns.view</component-type>
          <component-class>
               com.cvns.jsfcomponents.view.ViewComponent
          </component-class>
     </component>
     <render-kit>
          <renderer>
               <component-family>cvns.view</component-family>
               <renderer-type>cvns.view</renderer-type>
               <renderer-class>
                    com.cvns.jsfcomponents.view.ViewRenderer
               </renderer-class>
          </renderer>
=======================================================
this gives me error:
     at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:711)
     at javax.faces.component.UIViewRoot.encodeBegin(UIViewRoot.java:359)
     at javax.faces.webapp.UIComponentTag.encodeBegin(UIComponentTag.java:572)
     at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:459)
is there anything i m missing here?

Answer 1

hi...
it is f.view..
i had it corrected it before getting the error...
but i m not sure whether i can extend f:view...
the subview works pretty well
e.g.
<%@ taglib uri="http://covansys.com/jsf/core" prefix="cx"%>
<cx:view>
     <cx:subview id="subviewId">
          <cx:button id="buttonId" value="test" />
     </cx:subview>
</cx:view>
this one is working...
<%@ taglib uri="http://covansys.com/jsf/core" prefix="cx"%>
<f:view>
     <cx:subview id="subviewId">
          <cx:button id="buttonId" value="test" />
     </cx:subview>
</f:view>
is it because there is no parent for f:view... and subview is child of f:view and hence it is working...