0 Replies Latest reply on Oct 1, 2008 9:47 AM by marcusdidiusfalco

Own JSF Component Hello World

marcusdidiusfalco Oct 1, 2008 9:47 AM

Hello,
I am trying to learn how to build my own components with JSF. However I cannot get the simplest example to run :-(

Using JBoss 4.2.2.GA

package simple;

import java.io.IOException;

import javax.faces.component.UIComponentBase;
import javax.faces.component.UIOutput;
import javax.faces.context.FacesContext;
import javax.faces.context.ResponseWriter;

public class UISimple extends UIComponentBase {

 @Override
 public void encodeBegin(FacesContext context) throws IOException {

 }

 @Override
 public void encodeEnd(FacesContext context) throws IOException {
 ResponseWriter responseWriter = context.getResponseWriter();
 responseWriter.startElement("h1", null);
 responseWriter.writeText("foobar", null);
 responseWriter.endElement("h1");
 responseWriter.flush();
 }

 @Override
 public String getFamily() {
 // TODO Auto-generated method stub
 return null;
 }

 @Override
 public void decode(FacesContext context) {
 return;
 }
}

package simple;

import javax.faces.webapp.UIComponentELTag;

public class SimpleTag extends UIComponentELTag {

 @Override
 public String getComponentType() {
 return "simple.Simple";
 }

 @Override
 public String getRendererType() {
 return null;
 }

}

WEB-INF/simple.tld

<?xml version="1.0" encoding="UTF-8"?>
<taglib xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-jsptaglibrary_2_1.xsd"
 version="2.1">
 <tlib-version>1.1</tlib-version>
 <short-name>spinner</short-name>
 <uri>http://corejsf.com/simple</uri>
 <tag>
 <name>simple</name>
 <tag-class>simple.SimpleTag</tag-class>
 <body-content>scriptless</body-content>


 </tag>
</taglib>

WEB-INF/faces-config.xml

<?xml version="1.0"?>
<faces-config xmlns="http://java.sun.com/xml/ns/javaee"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
 http://java.sun.com/xml/ns/javaee/web-facesconfig_1_2.xsd"
 version="1.2">
 <component>
 <component-type>simple.Simple</component-type>
 <component-class>simple.UISimple</component-class>
 </component>

</faces-config>

WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_ID" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 <display-name>OwnComponent</display-name>
 <servlet>
 <servlet-name>Faces Servlet</servlet-name>
 <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
 <load-on-startup>1</load-on-startup>
 </servlet>

 <servlet-mapping>
 <servlet-name>Faces Servlet</servlet-name>
 <url-pattern>*.faces</url-pattern>
 </servlet-mapping>

 <welcome-file-list>
 <welcome-file>index.faces</welcome-file>
 </welcome-file-list>
</web-app>

The Jsp:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
 pageEncoding="ISO-8859-1"%>
<%@ taglib uri="http://corejsf.com/simple" prefix="s" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Simple</title>
</head>
<body>
 test
 <s:simple />
</body>
</html>

Except for "test" nothing is rendered.
What is my mistake?

And in a related issue:
How do I turn on debug Mode for JSF?
I never see anything in the log files relating to JSF.

Thanks for any help,

Hans