Tiles & RssChannel

[Jack Lau]

Hello all,

The following example is copied from "Tiles Advanced Features" by Cedric Dumoulin.

I would like to display different channels but it shows the following exceptions:

javax.servlet.ServletException: Cannot find bean CHANNEL in any scope
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:533)
at org.apache.jsp.rss_channels_jsp._jspService(rss_channels_jsp.java:110)

The configuration and code are listed below:

In tiles-def.xml

  <definition controllerUrl="/RssChannels.do" name=".tiles.rssChannels.body" path="/pages/test/rss_channels.jsp">
    <putList name="urls">
      <add value="http://www.newsforge.com/newsforge.rss" />
      <add value="http://xmlhack.com/rss.php" />
      <add value="http://lwn.net/headlines/rss" />
    </putList>
  </definition>

In RssChannelsAction class

public final class RssChannelsAction extends TilesAction {
 
    public static final String CHANNELS_KEY = "CHANNELS";
    public static final String CHANNEL_URLS_KEY = "urls";
 
    public RssChannelsAction() {
    }
 
    public ActionForward execute(ComponentContext context,
                                 ActionMapping mapping,
                                 ActionForm form, HttpServletRequest request,
                                 HttpServletResponse response) throws
        IOException, ServletException, Exception {
        System.out.println("inside RssChannelsAction");
        org.apache.commons.digester.rss.Channel channel = null;
 
        List channels = (List)context.getAttribute(CHANNEL_URLS_KEY);
        List channelBeans = new ArrayList(channels.size());
        for (int i = 0; i < channels.size(); i++) {
            RSSDigester digester = new RSSDigester();
            String url = (String)channels.get(i);
            System.out.println("url=" + url);
            Channel obj = (Channel)digester.parse(url);
            channelBeans.add(obj);
        }
        System.out.println("leave RssChannelsAction");
        context.putAttribute(CHANNELS_KEY, channelBeans);
        return null;
 
    }
}

In view

<%@ taglib uri="/WEB-INF/struts-html" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic" prefix="logic" %>
<%@ taglib uri="/WEB-INF/struts-tiles" prefix="tiles" %>
<div align="center">
                             
<tiles:importAttribute name="CHANNELS" scope="page"/>
 
<logic:iterate name="CHANNELS" id="CHANNEL" >
    <bean:write name="CHANNEL" property="title"/>
</logic:iterate>
 

It can print out the channels in RssChanelsAction but when going to the jsp, it shows the exception.

Does anyone know what is the problem ?

Thanks in advance!!
Jack