ClassCastException while reading ics file with ical4j in JackRabit

[vineet kumar chaudhry]

Hi

I am reading ics file using ical4j which are saved in JackRabit...

The below code is working fine

import java.io.FileInputStream;
import java.io.IOException;
import java.net.MalformedURLException;
import java.util.Iterator;

import javax.jcr.LoginException;
import javax.jcr.Node;
import javax.jcr.NodeIterator;
import javax.jcr.PathNotFoundException;
import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.SimpleCredentials;
import javax.jcr.ValueFormatException;

import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.data.ParserException;
import net.fortuna.ical4j.model.Calendar;
import net.fortuna.ical4j.model.Component;

import org.apache.jackrabbit.rmi.repository.URLRemoteRepository;


public class ReadICS {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		try {
			Repository repository = new URLRemoteRepository("http://192.16.17.60:8080/CalendarViewer/rmi");
			Session session = null;
			CalendarBuilder builder = new CalendarBuilder();
			session = repository.login(new SimpleCredentials("admin", "admin".toCharArray()));
			Node rootNode = session.getRootNode();		
			for (Iterator itr = rootNode.getNodes(); itr.hasNext();) {
				Node node = (Node) itr.next();
				System.out.println("NodeName = " + node.getName());
				if (node.getName().endsWith(".ics")) {

					Calendar calendar = builder.build(node.getNode("jcr:content").getProperty("jcr:data").getBinary().getStream());

					for (Iterator itr2 = calendar.getComponents("VEVENT").iterator(); itr2.hasNext();) {

						Component component = (Component) itr2.next();
						System.out.println("component = "+ component.getProperty("SUMMARY"));
						


					}
				}
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (LoginException e) {
			e.printStackTrace();
		} catch (ValueFormatException e) {
			e.printStackTrace();
		} catch (PathNotFoundException e) {
			e.printStackTrace();
		} catch (RepositoryException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (ParserException e) {
			e.printStackTrace();
		}

	}

}

But when I am doing the same thing in servlets, I am facing problem ,it is giving me 
**org.apache.jackrabbit.rmi.client.ClientNode cannot be cast to net.fortuna.ical4j.model.Component**

[code]

import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.jcr.LoginException;
import javax.jcr.Node;
import javax.jcr.NodeIterator;
import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.jcr.SimpleCredentials;
import javax.jcr.Value;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;



import net.fortuna.ical4j.data.CalendarBuilder;
import net.fortuna.ical4j.model.Calendar;
import net.fortuna.ical4j.model.Component;

import org.apache.jackrabbit.rmi.client.ClientNode;
import org.apache.jackrabbit.rmi.repository.URLRemoteRepository;
import org.apache.jackrabbit.servlet.ServletRepository;


public class Duplicate extends HttpServlet {

	private List<Node> icsFilesList = new ArrayList<Node>();

	SimpleDateFormat f = new SimpleDateFormat("yyyy/MM/dd");

	String todayDate = "";

	String htmlPrefix = "";

	String htmlMid = "";

	String htmlPostfix = "";

	public void doGet(HttpServletRequest req, HttpServletResponse resp)
	throws ServletException, IOException {

		String leadname = req.getParameter("selectedLead");
		System.out.println("selectedLead [" + leadname + "]");
		System.out.println("selected date [" + req.getParameter("theDate")
				+ "]");
		try {
			String htmlString = htmlPrefix + getLeadNamesHtmlString() + htmlMid
			+ getScheduleForLeads(leadname) + htmlPostfix;
			resp.getWriter().println(htmlString);
		} catch (RepositoryException e) {
			resp.getWriter().println(
					"Please conatct administrator. Error while accessing Calendar repository :\n"
					+ e.getMessage());
		}

	}

	public void init() throws ServletException {
		System.out.println("In the init() Method");
		//todayDate = f.format(Calendar.getInstance().getTime());

		htmlPrefix = "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\" "
			+ "\"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\"><html xmlns=\"http://www.w3.org/1999/xhtml\">"
			+ "<head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\" />"
			+ "<title>HR - Calendar Viewer</title><link href=\"style.css\" rel=\"stylesheet\" type=\"text/css\" />"
			+ "<link type=\"text/css\" rel=\"stylesheet\" href=\"calendar.css?random=20051112\" media=\"screen\"></LINK>"
			+ "<SCRIPT type=\"text/javascript\" src=\"calendar.js?random=20060118\"></script>"
			+ "</head><body><!--up div start --><div id=\"up_div\"><!--header start --><div id=\"header\">"
			+ "<!--img src=\"images/best_future.gif\" width=\"153\" height=\"91\" alt=\"best for future\"/-->"
			+ "<img src=\"images/bebo_technologies_logo.jpg\" alt=\"Bebo Technologies\" width=\"150\" height=\"100\" border=\"0\">"
			+ "<!--img class=\"logo\" src=\"images/bebo_technologies_logo.jpg\" width=\"200\" height=\"38\" title=\"bebo\" alt=\"bebo logo\" /-->"
			+ "<h1>Be Extension    Be Offshore</h1><ul>"
			+ "<li><a href=\"#\"> </a></li><li><a href=\"#\"> </a></li><li><a href=\"#\"> </a></li><li><a href=\"#\"> </a></li>"
			+ "<li><a href=\"#\"> </a></li><li><a href=\"#\"> </a></li><li><a href=\"#\"> </a></li></ul></div>"
			+ "<!--header end --></div><!--up div end --><!--mid div start --><!--body part start -->"
			+ "<div id=\"body_pan\"><h2>Schedule of leads on <br /><form align=\"right\"><input type=\"text\" value=\""
			+ todayDate
			+ "\" style=\"width:70px;\""
			+ "readonly name=\"theDate\"><input type=\"button\" value=\"Cal\" "
			+ "onclick=\"displayCalendar(document.forms[0].theDate,'yyyy/mm/dd',this)\"></form></h2><div id=\"update\"><p class=\"up\">"
			+ "</p><div id=\"latest\"><h2>Lead names</h2>";

		htmlMid = "<br class=\"bank\" /></div><p class=\"down\"></p></div><!-- services star -->"
			+ "<div id=\"ser\"><p class=\"se\"></p><div id=\"services\">";

		htmlPostfix = "<br class=\"bank\" /></div><p class=\"se_down\"></p></div><!--services end --><!--body part end -->"
			+ "<br class=\"bank\" /></div></div><div id=\"footer\"><div id=\"foo\"><ul><li><a href=\"#\">Home</a>|</li>"
			+ "<li><a href=\"#\">About Us</a>|</li><li><a href=\"#\">Company </a>|</li><li><a href=\"#\">Partners</a>|</li>"
			+ "<li><a href=\"#\">Blog</a>|</li><li><a href=\"#\">Resources </a>|</li><li><a href=\"#\">Contact</a></li></ul>"
			+ "<p>Copyright © bebo Technologies Pvt Ltd. All rights reserved.</p></div></div><!--mid div end --></body></html>";

		try {
			Repository repository = new URLRemoteRepository(
			"http://192.16.17.60:8080/CalendarViewer/rmi");
			Session session = null;

			session = repository.login(new SimpleCredentials("admin", "admin"
					.toCharArray()));
			Node rootNode = session.getRootNode();
			NodeIterator itr = rootNode.getNodes();
			for (Iterator iterator = rootNode.getNodes(); iterator.hasNext();) {
				Node node = (Node) iterator.next();
				System.out.println("NodeName = " + node.getName());
				if (node.getName().endsWith(".ics")) {
					icsFilesList.add(node);
					
					//System.out.println("DataContent : " + datacontent);
				}
			}
		} catch (LoginException e) {
			throw new ServletException(e);
		} catch (RepositoryException e) {
			throw new ServletException(e);
		} catch (Exception e) {

		}

	}

	/**
	 * <ul>
	 * <li><a href="#">Lead 1 </a></li>
	 * <li><a href="#">Lead 2</a></li>
	 * <li><a href="#">Lead 3</a></li>
	 * <li><a href="#">Lead 4</a></li>
	 * </ul>
	 * 
	 * @return
	 * @throws RepositoryException
	 */
	private String getLeadNamesHtmlString() throws RepositoryException {

		StringBuffer htmlStr = new StringBuffer("<ul>");

		String contextPath = getServletContext().getContextPath();

		System.out.println("contextPath : " + contextPath);

		contextPath = contextPath + "/viewer?selectedLead=";
		htmlStr.append("<li><a href=\"" + contextPath + "\">All</a>");
		for (Iterator iterator = icsFilesList.iterator(); iterator.hasNext();) {
			Node node = (Node) iterator.next();
			String filename = node.getName();
			String lead = filename.substring(0, filename.indexOf(".ics"));

			htmlStr.append("<li><a href=\"" + contextPath + lead + "\">");

			htmlStr.append(lead);
			htmlStr.append("</a></li>");

		}

		htmlStr.append("</ul>");

		return htmlStr.toString();
	}

	private String getScheduleForLeads(String leadname)
	throws RepositoryException {
		System.out.println("In the getScheduleForLeads() Method with arg = "
				+ leadname);
		StringBuffer htmlStr = new StringBuffer("");

		for (Iterator iterator = icsFilesList.iterator(); iterator.hasNext();) {
			Node node = (Node) iterator.next();
			String filename = node.getName();
			String lead = filename.substring(0, filename.indexOf(".ics"));

			if (leadname != null && !leadname.equals("")
					&& lead.equals(leadname)) {
				System.out.println("adding cal for : " + leadname);
				htmlStr.append("<h2>");
				htmlStr.append(lead);
				htmlStr.append("</h2>");
				/*
				 * htmlStr .append("<table border=\"0\">" + "<tr><td>10:00
				 * to 12:00 </td><td><font size=\"4\">Interview with yyyyyy on
				 * ttttttt using mmmmmmm</font></td></tr>" + "<tr><td>1:00
				 * to 2:00 </td><td><font size=\"3\">Interview with xxxxxx on
				 * dddjdjd using dkdkdkd</font></td></tr>" + "</table>");
				 */

				try {
					FileInputStream fin = new FileInputStream(filename);

					CalendarBuilder builder = new CalendarBuilder();

					System.out.println("PATH --->" + node.getPath());
					net.fortuna.ical4j.model.Calendar calendar = builder
					.build(node.getNode("jcr:content").getProperty(
					"jcr:data").getBinary().getStream());


					List list = calendar.getComponents("VEVENT");
					System.out.println(list.size());

					for (Iterator iterator2 = list.iterator(); iterator
					.hasNext();) {
						String eventName = null;
						String eventStartDate = null;
						String eventEndDate = null;
						String eventRepeatPattern = null;




						Component component = (Component) iterator.next();

						eventName = component.getProperty("SUMMARY").getValue();
						eventStartDate = component.getProperty("DTSTART")
						.getValue();
						eventEndDate = component.getProperty("DTEND")
						.getValue();
						if (component.getProperty("RRULE") != null) {
							eventRepeatPattern = component.getProperty("RRULE")
							.getValue();
						}

						System.out.println(eventName);
						System.out.println(eventStartDate);
						System.out.println(eventEndDate);
						if (eventRepeatPattern != null) {

							System.out.println(eventRepeatPattern);
						}

						System.out.println();

						htmlStr.append("<table border=\"0\">" + "<tr><td>"
								+ eventName + "</td><td><font size=\"4\">"
								+ eventStartDate + "</font></td>"
								+ "<td><font size=\"4\">" + eventEndDate
								+ "</font></td></tr>" + "</table>");
					}

				} catch (Exception e) {
					System.out.println("Execption ---> " + e.getMessage());
				}

				String datacontent = node.getNode("jcr:content").getProperty(
				"jcr:data").getString();
				break;
			} else if (leadname == null || leadname.equals("")) {
				System.out.println("adding cal for ================== " + leadname);
				htmlStr.append("<h2>");
				htmlStr.append(lead);
				htmlStr.append("</h2>");

				String datacontent = node.getNode("jcr:content").getProperty("jcr:data").getString();

				//htmlStr.append(datacontent);

				byte datacontentInBytes[] = datacontent.getBytes();
				try {

					CalendarBuilder builder = new CalendarBuilder();

					FileOutputStream fos = new FileOutputStream("\\\\192.16.17.52//shared//vin.ics");
					fos.write(datacontentInBytes);
					fos.flush();
					fos.close();

					//ByteArrayInputStream bis = new ByteArrayInputStream(datacontentInBytes);
					FileInputStream fis = new FileInputStream("\\\\192.16.17.52//shared//vin.ics");

					Calendar calendar = builder.build(node.getNode("jcr:content").getProperty("jcr:data").getBinary().getStream());

					List list1 = calendar.getComponents("VEVENT");		
					
					System.out.println("list size = "+list1.size());

					for (Iterator iterator2 = list1.iterator(); iterator.hasNext();) {
						
						String eventName = null; 
						String eventStartDate = null; 
						String eventEndDate = null; 
						String eventRepeatPattern =	null;		
						
						Component component = (Component) iterator.next();
						System.out.println("component = "+ component);
						//htmlStr.append(datacontent);

						/*component.
						//eventNamev = component.getProperty("SUMMARY");
						//eventName = eventNamev.getString();
						eventStartDate = component.getProperty("DTSTART").getValue(); 
						eventEndDate = component.getProperty("DTEND").getValue(); 
						
						if (component.getProperty("RRULE") != null) {
							
							eventRepeatPattern = component.getProperty("RRULE")	.getValue(); 
							
						}

						System.out.println(eventName);
						System.out.println(eventStartDate);
						System.out.println(eventEndDate); 
						
						if(eventRepeatPattern != null){

							System.out.println(eventRepeatPattern);
						}

						System.out.println();
						//htmlStr.append(eventName);


						htmlStr.append("<table border=\"0\">" + "<tr><td>" +
								eventName + "</td><td><font size=\"4\">" + eventStartDate + "</font></td>" + 
								"<td><fontsize=\"4\">" + eventEndDate + "</font></td></tr>" + "</table>"); */
						
						System.out.println(" ================== " );
						}
				} catch (Exception e) { 
					System.out.println("Execption ---> " +e.getMessage()); 
				}

			}

		}

		return htmlStr.toString();
	}
}

[/code]

[Mohammad Monis]

org.apache.jackrabbit.rmi.client.ClientNode cannot be cast to net.fortuna.ical4j.model.Component - I didn't see anywhere in the servlet code that you are casting ClientNode to Componet. So the error might be coming from different code section. Can you share the line no. indicated in the error log at which the cast is failing.