Custom renderer on standard component

Question

I try to implement a custom renderer to a standard component (<h:outputText>), but
my Tomcat failed to start the webcontainer.
here are my files:
faces-config.xml
<render-kit>
<renderer>
<renderer-type>MyRenderer</renderer-type>
<renderer-class>renderkit.MyRenderer</renderer-class>
</renderer>
<supported-component-class>
<component-class>javax.faces.Text</component-class>
</supported-component-class>
</render-kit>
...renderkit.MyRenderer.java
package renderkit;
import java.io.IOException;
import javax.faces.component.UIComponent;
import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;
import javax.faces.render.Renderer;
public class MyRenderer extends Renderer {
     public void decode(FacesContext context, UIComponent component) {
          System.out.println("decode");
          if ((context == null) || (component == null)) {
               throw new NullPointerException();
     public void encodeBegin(FacesContext context, UIComponent component)
          throws IOException {
          System.out.println("encodeBegin");
          if ((context == null) || (component == null)) {
               throw new NullPointerException();
     public void encodeChildren(FacesContext context, UIComponent component)
          throws IOException {
          System.out.println("encodeChildren");
          if ((context == null) || (component == null)) {
               throw new NullPointerException();
     public void encodeEnd(FacesContext context, UIComponent component)
          throws IOException {
          System.out.println("encodeEnd");
          UIOutput comp = (UIOutput) component;
          ResponseWriter writer = context.getResponseWriter();
          StringBuffer sb = null;
          writer.startElement("<test>", comp);
          writer.write(comp.getValue().toString());
          writer.endElement("</test>");
}

Answer 1

<h:outputText> will use a rendererType of "javax.faces.Text"; to use a custom renderer on a standard component, you must not only write a renderer and register it, but also add a custom tag that uses that renderer type. Alternatively, you could use the "binding" attribute to set the renderer type like:
  <h:outputText binding="#{someBean.customText}" .../>
public class SomeBean
  public SomeBean()
   HtmlOutputText customText = new HtmlOutputText();
    customText.setRendererType("MyRenderer");
    setCustomText(customText);
  public HtmlOutputText getCustomText()
    return _customText;
public void setCustomText(HtmlOutputText customText)
   _customText = customText;
private HtmlOutputText _customText;
}-- Adam Winer (EG member)