1st jsf custom component.. getting nullpointer Ex, what's wrong?

hi guys
I'm following this ex to create a custom component
http://today.java.net/pub/a/today/2004/07/16/jsfcustom.html
but I'm having problems like
java.lang.NullPointerException
     at javax.faces.webapp.UIComponentTag.setupResponseWriter(UIComponentTag.java:929)
     at javax.faces.webapp.UIComponentTag.doStartTag(UIComponentTag.java:310)
     at org.apache.myfaces.taglib.core.ViewTag.doStartTag(ViewTag.java:70)
     at org.apache.jsp.Simple_jsp._jspx_meth_f_view_0(org.apache.jsp.Simple_jsp:114)
     at org.apache.jsp.Simple_jsp._jspService(org.apache.jsp.Simple_jsp:89)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
     at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:477)
     at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:371)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
     at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
     at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
     at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
     at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
     at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
     at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
     at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:211)
     at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
     at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
     at org.mortbay.jetty.Server.handle(Server.java:313)
     at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
     at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:830)
     at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514)
     at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
     at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
     at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
     at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)do you know what's the problem
thanks ;)

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1st jsf custom component.. getting nullpointer Ex, what's wrong?

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