ZK - Open Source Ajax Java Framework

package com.pearson.t3.customTags;

import java.io.IOException;
import java.io.Serializable;
import java.util.*;

import javax.faces.component.FacesComponent;
import javax.faces.component.UIComponentBase;
import javax.faces.context.*;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.zkoss.lang.Classes;
import org.zkoss.util.logging.Log;
import org.zkoss.zk.ui.GenericRichlet;
import org.zkoss.zk.ui.Page;
import org.zkoss.zk.ui.metainfo.Property;
import org.zkoss.zk.ui.metainfo.PropertyNotFoundException;
import org.zkoss.zk.ui.util.Composer;
import org.zkoss.zkplus.embed.Renders;
import org.zkoss.zss.ui.Spreadsheet;
@FacesComponent(value="spreadsheet")
public class ZKSpreadsheetTag extends UIComponentBase{
  
	 private static final Log log = Log.lookup(ZKSpreadsheetTag.class);
	 private Spreadsheet spreadsheet;
	 
	 public String getFamily()
	    {
	        return "spreadsheet";
	    }

	    public Spreadsheet getSpreadsheet()
	    {
	        return spreadsheet;
	    }
	 
	 public void encodeBegin(FacesContext context) throws IOException {
		 ServletContext svlctx = (ServletContext)context.getExternalContext().getContext();
	        HttpServletRequest request = (HttpServletRequest) context.getExternalContext().getRequest();
	        HttpServletResponse response = (HttpServletResponse) context.getExternalContext().getResponse();
	        ResponseWriter responseWriter = context.getResponseWriter();
	      
	        
	        try {
	            Renders.render(svlctx, request,response, 
	                    new GenericRichlet() {  
	                        public void service(Page page) throws Exception {
	                        	spreadsheet = new Spreadsheet();
	                        	spreadsheet.setPage(page);
	                            applyProperties();
	                            spreadsheet.setId(getClientId());
	                            doAfterCompose();
	                        }
	                    }, null, responseWriter);
	            Object priya = new Object();
	        } catch (ServletException e) {
	        	 log.debug(e.getMessage());
	        	 System.err.println(e.getMessage());
	             throw new IOException(e.getMessage());
	        } catch(IOException e)
	        {
	        	System.err.println(e.getMessage());
	        	 throw new IOException(e.getMessage());
	        }
		 
	 }
	 
	 /** apply ZK component properties as retrieved from JSF custom component tag */
	    private void applyProperties() {
	        Map<String, Object> attrs = getAttributes();
	        Set<String> attrNames = attrs.keySet();
	         
	        for (Iterator iterator = attrNames.iterator(); iterator.hasNext();) {
	            String attrName = (String) iterator.next();
	            if(!"apply".equals(attrName)) {
	                try {
	                    Property.assign(spreadsheet, attrName, attrs.get(attrName).toString());
	                } catch(PropertyNotFoundException pnfe) {
	                   System.err.println(pnfe.getMessage());
	                }
	            }
	        }
	    }
	    
	    /** apply composer by calling doAfterCompose after ZK component is composed */
	    private void doAfterCompose() throws Exception {
	        Object o = getAttributes().get("apply");
	        if(o!=null)
	        {
//	          System.out.println("o class name"+o.getClass().getName());
		        if(o instanceof String) {
		            o = Classes.newInstanceByThread(o.toString());
		        }
		        if(o instanceof Composer) {
		            ((Composer)o).doAfterCompose(spreadsheet);
		        }
	        }
//	        System.out.println("Hi");
	        Object priya1 = new Object();
	    }
	    
	    
}

<?xml version="1.0" encoding="UTF-8"?>
<facelet-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-facelettaglibrary_2_0.xsd"
	version="2.0">
	<namespace>http://www.zkoss.org/jsf/zss</namespace>
	<tag>
		<tag-name>spreadsheet</tag-name>
		<component>
			<component-type>spreadsheet</component-type>
		</component>
	</tag>
</facelet-taglib>

 <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
<servlet>
  	<description>
  	The asynchronous update engine for ZK</description>
  	<servlet-name>auEngine</servlet-name>
  	<servlet-class>
  	org.zkoss.zk.au.http.DHtmlUpdateServlet</servlet-class>
  </servlet>
  <!--  T3 changes - End -->  
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
  </servlet-mapping>
 <servlet-mapping>
  	<servlet-name>auEngine</servlet-name>
  	<url-pattern>/zkau/*</url-pattern>
  </servlet-mapping>
 <context-param>
		<param-name>javax.faces.FACELETS_LIBRARIES</param-name>
		<param-value>/WEB-INF/jsfzss-taglib.xml</param-value>
	</context-param>