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+                    GNU AFFERO GENERAL PUBLIC LICENSE
+                       Version 3, 19 November 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
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+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If your software can interact with users remotely through a computer
+network, you should also make sure that it provides a way for users to
+get its source.  For example, if your program is a web application, its
+interface could display a "Source" link that leads users to an archive
+of the code.  There are many ways you could offer source, and different
+solutions will be better for different programs; see section 13 for the
+specific requirements.
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU AGPL, see
+<http://www.gnu.org/licenses/>.
diff --git a/src/main/java/de/dhbw/horb/calendar/ICSServlet.java b/src/main/java/de/dhbw/horb/calendar/ICSServlet.java
new file mode 100644
index 0000000..8a1be3e
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ICSServlet.java
@@ -0,0 +1,39 @@
+package de.dhbw.horb.calendar;
+
+import java.io.IOException;
+
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import de.dhbw.horb.calendar.dualis.DualisConnection;
+import de.dhbw.horb.calendar.dualis.DualisException;
+import de.dhbw.horb.calendar.ics.VCalendar;
+import de.dhbw.horb.calendar.ics.VEvent;
+import de.dhbw.horb.calendar.util.AuthenticatedServlet;
+
+public class ICSServlet extends AuthenticatedServlet {
+	private static final long serialVersionUID = 1L;
+
+	public ICSServlet() {
+		setLoginRealm("Dualis Calendar Connector");
+	}
+
+	@Override
+	protected void doGet(HttpServletRequest request,
+			HttpServletResponse response, String username, String password)
+			throws IOException {
+		response.setHeader("Content-Type", "text/calendar; charset=utf-8");
+		
+		VCalendar calendar = new VCalendar("DHBW Calendar");
+		try {
+			DualisConnection connection = new DualisConnection(username,
+					password);
+			for (VEvent event : connection.getEvents()) {
+				calendar.add(event);
+			}
+		} catch (DualisException e) {
+			e.printStackTrace();
+		}
+		response.getOutputStream().write(calendar.serialize().getBytes());
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/de/dhbw/horb/calendar/dualis/DualisConnection.java b/src/main/java/de/dhbw/horb/calendar/dualis/DualisConnection.java
new file mode 100644
index 0000000..f7bf369
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/dualis/DualisConnection.java
@@ -0,0 +1,173 @@
+package de.dhbw.horb.calendar.dualis;
+
+import java.io.IOException;
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.regex.Pattern;
+
+import org.apache.commons.lang.StringUtils;
+
+import com.gargoylesoftware.htmlunit.ElementNotFoundException;
+import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;
+import com.gargoylesoftware.htmlunit.WebClient;
+import com.gargoylesoftware.htmlunit.html.DomAttr;
+import com.gargoylesoftware.htmlunit.html.HtmlAnchor;
+import com.gargoylesoftware.htmlunit.html.HtmlElement;
+import com.gargoylesoftware.htmlunit.html.HtmlForm;
+import com.gargoylesoftware.htmlunit.html.HtmlInput;
+import com.gargoylesoftware.htmlunit.html.HtmlPage;
+
+import de.dhbw.horb.calendar.dualis.DualisException.DualisAuthenticationException;
+import de.dhbw.horb.calendar.dualis.DualisException.DualisScrapingException;
+import de.dhbw.horb.calendar.ics.VEvent;
+
+public class DualisConnection {
+	public static final String DUALIS_URL = "https://dualis.dhbw.de/scripts/mgrqcgi?APPNAME=CampusNet&PRGNAME=EXTERNALPAGES&ARGUMENTS=-N000000000000001,-N,-Awelcome";
+
+	private final String username;
+	private final String password;
+
+	/**
+	 * Baut eine Verbindung mit Dualis auf und führt einen Login durch
+	 * 
+	 * @param username
+	 *            Dualis Benutzername
+	 * @param password
+	 *            Dualis Password
+	 * @throws FailingHttpStatusCodeException
+	 * @throws IOException
+	 * @throws DualisScrapingException
+	 * @throws DualisAuthenticationException
+	 */
+	public DualisConnection(final String username, final String password) {
+		this.username = username;
+		this.password = password;
+	}
+
+	@SuppressWarnings("deprecation")
+	public List<VEvent> getEvents() throws FailingHttpStatusCodeException,
+			IOException, DualisScrapingException, DualisAuthenticationException {
+		HtmlPage page, loginPage;
+		final HtmlForm loginForm;
+		final HtmlInput usernameField, passwordField, submitButton;
+		final WebClient webClient = new WebClient();
+		final List<VEvent> events = new ArrayList<VEvent>();
+
+		webClient.setJavaScriptEnabled(false);
+		loginPage = webClient.getPage(DUALIS_URL);
+		try {
+			loginForm = loginPage.getFormByName("cn_loginForm");
+		} catch (ElementNotFoundException e) {
+			throw new DualisException.DualisScrapingException(
+					"Fehler beim Suchen des Login Formular auf der Startseite mit Name 'cn_loginForm'",
+					e);
+		}
+		try {
+			usernameField = loginForm.getInputByName("usrname");
+		} catch (ElementNotFoundException e) {
+			throw new DualisException.DualisScrapingException(
+					"Fehler beim Suchen des Username Input mit Name 'usrname'",
+					e);
+		}
+		usernameField.type(username);
+		try {
+			passwordField = loginForm.getInputByName("pass");
+		} catch (ElementNotFoundException e) {
+			throw new DualisException.DualisScrapingException(
+					"Fehler beim Suchen des Password Input mit Name 'pass'", e);
+		}
+		passwordField.type(password);
+
+		try {
+			submitButton = loginForm.getInputByValue("Anmelden");
+		} catch (ElementNotFoundException e) {
+			throw new DualisException.DualisScrapingException(
+					"Fehler beim Suchen des Login Submit Buttons mit Text 'Anmelden'",
+					e);
+		}
+		page = submitButton.click();
+		HtmlAnchor anchorByText;
+		try {
+			anchorByText = page.getAnchorByText("Stundenplan");
+		} catch (ElementNotFoundException e) { // Login failed
+			throw new DualisException.DualisAuthenticationException(
+					"Authentifizierung fehltgeschlagen", e);
+		}
+		page = anchorByText.click();
+
+		HtmlAnchor anchorMonat;
+		try {
+			anchorMonat = page.getAnchorByText("Monat");
+		} catch (ElementNotFoundException e) {
+			throw new DualisException.DualisScrapingException(
+					"Link Studenplan 'Woche' nicht gefunden", e);
+		}
+		page = anchorMonat.click();
+
+		for (HtmlElement elem : page.getElementsByTagName("div")) {
+			if (!elem.getAttribute("class").equals("tbMonthDay"))
+				continue;
+			final Date day;
+			Object dayTitle = elem
+					.getFirstByXPath("div[@class='tbsubhead']/a/@title");
+			if (dayTitle instanceof DomAttr) {
+				String value = ((DomAttr) dayTitle).getValue();
+				try {
+					day = dateFormat.parse(value);
+				} catch (ParseException e) {
+					e.printStackTrace();
+					continue;
+				}
+			} else {
+				System.err.println("kann datum nicht bestimmen");
+				continue;
+			}
+			for (HtmlElement appLink : elem.getElementsByTagName("a")) {
+				if (!appLink.getAttribute("class").equals("apmntLink"))
+					continue;
+				// title="08:15 - 10:45 / HOR-121 / Open Source Systeme"
+				String desc = StringUtils.strip(appLink.getAttribute("title"));
+				java.util.regex.Matcher matcher = appLinkPattern.matcher(desc);
+				if (matcher.matches() && matcher.groupCount() == 4) {
+					String timeStart = matcher.group(1);
+					String timeEnd = matcher.group(2);
+					String room = matcher.group(3);
+					String title = matcher.group(4);
+					System.out.println(timeStart + "-" + timeEnd + "-" + room
+							+ "-" + title + "-" + day);
+					int hStart = Integer.parseInt(timeStart.split(":")[0]);
+					int mStart = Integer.parseInt(timeStart.split(":")[1]);
+					int hEnd = Integer.parseInt(timeEnd.split(":")[0]);
+					int mEnd = Integer.parseInt(timeEnd.split(":")[1]);
+					Date start = (Date) day.clone();
+					start.setHours(hStart);
+					start.setMinutes(mStart);
+					Date end = (Date) day.clone();
+					end.setHours(hEnd);
+					end.setMinutes(mEnd);
+					VEvent event = new VEvent.Builder().dtstart(start)
+							.dtstamp(start).dtend(end).summary(title).description(title)
+							.location(room).status("CONFIRMED").build();
+					events.add(event);
+				} else {
+					System.err.println("Skip: " + desc + " at day " + day);
+				}
+			}
+		}
+
+		return events;
+	}
+
+	// Parse Dates
+	private static final SimpleDateFormat dateFormat = new SimpleDateFormat(
+			"dd.MM.yyyy");
+	
+	// Appointment Link Title
+	// example: 08:15 - 10:45 / HOR-121 / Open Source Systeme
+	private static final Pattern appLinkPattern = Pattern
+			.compile("(\\d{2}:\\d{2})\\s-\\s(\\d{2}:\\d{2})\\s\\/\\s(.+)\\s\\/\\s(.+)");
+
+}
\ No newline at end of file
diff --git a/src/main/java/de/dhbw/horb/calendar/dualis/DualisException.java b/src/main/java/de/dhbw/horb/calendar/dualis/DualisException.java
new file mode 100644
index 0000000..5f337a2
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/dualis/DualisException.java
@@ -0,0 +1,33 @@
+package de.dhbw.horb.calendar.dualis;
+
+public abstract class DualisException extends Exception {
+	public DualisException(String msg) {
+		super(msg);
+	}
+
+	public DualisException(String msg, Throwable e) {
+		super(msg, e);
+	}
+
+	private static final long serialVersionUID = 1L;
+
+	public static class DualisAuthenticationException extends DualisException {
+		private static final long serialVersionUID = 1L;
+
+		public DualisAuthenticationException(String msg, Throwable e) {
+			super(msg, e);
+		}
+
+		public DualisAuthenticationException(String msg) {
+			super(msg);
+		}
+	}
+
+	public static class DualisScrapingException extends DualisException {
+		private static final long serialVersionUID = 1L;
+
+		public DualisScrapingException(String msg, Throwable e) {
+			super(msg, e);
+		}
+	}
+}
diff --git a/src/main/java/de/dhbw/horb/calendar/ics/AbstractICSType.java b/src/main/java/de/dhbw/horb/calendar/ics/AbstractICSType.java
new file mode 100644
index 0000000..3b6019d
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ics/AbstractICSType.java
@@ -0,0 +1,43 @@
+package de.dhbw.horb.calendar.ics;
+
+import java.text.SimpleDateFormat;
+
+import org.apache.commons.lang.StringEscapeUtils;
+
+public abstract class AbstractICSType {
+	/**
+	 * Serialisierert dieses Calenderteil. Dem Ergebnis Fehlt noch der vCalendar
+	 * Header und Footer
+	 * 
+	 */
+	public abstract String serialize();
+
+	/**
+	 * <b>RFC says:</b>
+	 * <pre>
+	 * FORM #2: DATE WITH UTC TIME
+	 * 
+	 *       The date with UTC time, or absolute time, is identified by a LATIN
+	 *       CAPITAL LETTER Z suffix character, the UTC designator, appended to
+	 *       the time value.  For example, the following represents January 19,
+	 *       1998, at 0700 UTC:
+	 * 
+	 *        19980119T070000Z
+	 * 
+	 *       The "TZID" property parameter MUST NOT be applied to DATE-TIME
+	 *       properties whose time values are specified in UTC.
+	 * </pre>
+	 */
+	public static SimpleDateFormat dateTimeFormat = new SimpleDateFormat(
+			"yyyyMMdd'T'HHmmss'Z'");
+	
+	/**
+	 * described in <b>RFC section 3.3.11</b>
+	 * 
+	 * @param text
+	 * @return
+	 */
+	public static String escapeText(String text) {
+		return StringEscapeUtils.escapeJava(text); //XXX TODO
+	}
+}
diff --git a/src/main/java/de/dhbw/horb/calendar/ics/VCalendar.java b/src/main/java/de/dhbw/horb/calendar/ics/VCalendar.java
new file mode 100644
index 0000000..fcf083a
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ics/VCalendar.java
@@ -0,0 +1,51 @@
+package de.dhbw.horb.calendar.ics;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class VCalendar {
+	List<AbstractICSType> icsObjects = new ArrayList<AbstractICSType>();
+	private final String title;
+
+	public VCalendar(final String title) {
+		this.title = title;
+	}
+
+	public void add(AbstractICSType ics) {
+		icsObjects.add(ics);
+	}
+
+	/**
+	 * 
+	 * @return
+	 */
+	public String serialize() {
+		final StringBuilder sb = new StringBuilder();
+		// Einleiten des Kalenders
+		sb.append("BEGIN:VCALENDAR\n");
+		// This property specifies the identifier for the product that created
+		// the iCalendar object.
+		sb.append("PRODID:-//DHBW Horb i08005//DHBW Calender 0.1//EN\n");
+		// Datenformat version
+		sb.append("VERSION:2.0\n");
+		// This property defines the calendar scale used for the
+		// calendar information specified in the iCalendar object.
+		sb.append("CALSCALE:GREGORIAN\n");
+		// This property defines the iCalendar object method
+		// associated with the calendar object.
+		sb.append("METHOD:PUBLISH\n");
+		/* Extensions */
+		//
+		sb.append("X-WR-TIMEZONE:UTC\n");
+		// Name des Kalenders
+		sb.append("X-WR-CALDESC:" + AbstractICSType.escapeText(title)+"\n");
+		sb.append("X-WR-CALNAME:" + AbstractICSType.escapeText(title)+"\n");
+		
+		// Elemente
+		for (AbstractICSType ics : icsObjects) {
+			sb.append(ics.serialize());
+		}
+		sb.append("END:VCALENDAR\n");
+		return sb.toString();
+	}
+}
diff --git a/src/main/java/de/dhbw/horb/calendar/ics/VEvent.java b/src/main/java/de/dhbw/horb/calendar/ics/VEvent.java
new file mode 100644
index 0000000..74f00ba
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ics/VEvent.java
@@ -0,0 +1,79 @@
+package de.dhbw.horb.calendar.ics;
+
+import java.util.Date;
+
+public class VEvent extends AbstractICSType {
+	public Date dtstamp = new Date();
+	public Date dtstart = new Date();
+	public Date dtend = new Date();
+	public String status = "";
+	public String summary = "";
+	public String description = "";
+	public String location = "";
+
+	/**
+	 * {@inheritDoc} <br/>
+	 * <br/>
+	 * <b>See RFC section 3.6.1</b> for VEVENT Specification
+	 */
+	@Override
+	public String serialize() {
+		final StringBuffer sb = new StringBuffer();
+		sb.append("BEGIN:VEVENT\n");
+		sb.append("DTSTART:" + dateTimeFormat.format(dtstart) + "\n");
+		sb.append("DTEND:" + dateTimeFormat.format(dtend) + "\n");
+		sb.append("DTSTAMP:" + dateTimeFormat.format(dtstamp) + "\n");
+		sb.append("UID:vevent_" + dateTimeFormat.format(dtstamp) + "@dhbw.de\n");
+		sb.append("CREATED:" + dateTimeFormat.format(new Date()) + "\n");
+		sb.append("STATUS:" + escapeText(status) + "\n");
+		sb.append("SUMMARY:" + escapeText(summary) + "\n");
+		sb.append("DESCRIPTION:" + escapeText(description) + "\n");
+		sb.append("LOCATION:" + escapeText(location) + "\n");
+		sb.append("TRANSP:OPAQUE\n");
+		sb.append("END:VEVENT\n");
+		return sb.toString();
+	}
+
+	public static class Builder {
+		VEvent event = new VEvent();
+
+		public Builder dtstamp(Date dtstamp) {
+			event.dtstamp = dtstamp;
+			return this;
+		}
+
+		public Builder dtstart(Date dtstart) {
+			event.dtstart = dtstart;
+			return this;
+		}
+
+		public Builder dtend(Date dtend) {
+			event.dtend = dtend;
+			return this;
+		}
+
+		public Builder summary(String summary) {
+			event.summary = summary;
+			return this;
+		}
+
+		public Builder description(String description) {
+			event.description = description;
+			return this;
+		}
+
+		public Builder location(String location) {
+			event.location = location;
+			return this;
+		}
+
+		public VEvent build() {
+			return event;
+		}
+
+		public Builder status(String status) {
+			event.status = status;
+			return this;
+		}
+	}
+}
diff --git a/src/main/java/de/dhbw/horb/calendar/ui/LoginWorker.java b/src/main/java/de/dhbw/horb/calendar/ui/LoginWorker.java
new file mode 100644
index 0000000..aa2c9b7
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ui/LoginWorker.java
@@ -0,0 +1,90 @@
+package de.dhbw.horb.calendar.ui;
+
+import java.io.IOException;
+
+import com.gargoylesoftware.htmlunit.ElementNotFoundException;
+import com.gargoylesoftware.htmlunit.WebClient;
+import com.gargoylesoftware.htmlunit.html.HtmlForm;
+import com.gargoylesoftware.htmlunit.html.HtmlInput;
+import com.gargoylesoftware.htmlunit.html.HtmlPage;
+
+import de.dhbw.horb.calendar.dualis.DualisConnection;
+import de.dhbw.horb.calendar.dualis.DualisException;
+import de.dhbw.horb.calendar.dualis.DualisException.DualisAuthenticationException;
+
+class LoginWorker implements Runnable {
+	private final WebClient client;
+	private HtmlPage page = null;
+	private HtmlForm loginForm = null;
+	private HtmlInput usernameField;
+	private HtmlInput passwordField;
+	private HtmlInput submitButton;
+	private final String username;
+	private final String password;
+	private final LoginWorkerListener listener;
+
+	public LoginWorker(final LoginWorkerListener listener, final String username, final String password) {
+		this.listener = listener;
+		this.username = username;
+		this.password = password;
+
+		client = new WebClient();
+	}
+
+	private void step1() throws Exception {
+		page = client.getPage(DualisConnection.DUALIS_URL);
+	}
+
+	private void step2() {
+		loginForm = page.getFormByName("cn_loginForm");
+		usernameField = loginForm.getInputByName("usrname");
+		passwordField = loginForm.getInputByName("pass");
+		submitButton = loginForm.getInputByValue("Anmelden");
+	}
+
+	private void step3() throws IOException {
+		usernameField.type(username);
+		passwordField.type(password);
+		page = submitButton.click();
+	}
+
+	private void step4() throws DualisAuthenticationException {
+		try {
+			page.getAnchorByText("Stundenplan");
+		} catch (ElementNotFoundException e) {
+			throw new DualisException.DualisAuthenticationException(
+					"Authentifizierung fehltgeschlagen", e);
+		}
+	}
+
+	@Override
+	public void run() {
+		try {
+			listener.setProgress(0.2, "Lade Seite");
+			step1();
+
+			listener.setProgress(0.4, "Analysiere Seite");
+			step2();
+
+			listener.setProgress(0.6, "Sende Login");
+			step3();
+
+			listener.setProgress(0.8, "Prüfe Login");
+			step4();
+			listener.setProgress(1.0, "Erfolgreich");
+			
+			listener.success(username,password);
+		} catch (Exception e) {
+			e.printStackTrace();
+			listener.error(e);
+		}
+	}
+
+	public interface LoginWorkerListener {
+		public void setProgress(double d, String description);
+
+		public void success(String username, String password);
+
+		public void error(Exception e);
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/de/dhbw/horb/calendar/ui/MyApplication.java b/src/main/java/de/dhbw/horb/calendar/ui/MyApplication.java
new file mode 100644
index 0000000..9a0f222
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ui/MyApplication.java
@@ -0,0 +1,161 @@
+package de.dhbw.horb.calendar.ui;
+
+import com.vaadin.Application;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Button.ClickEvent;
+import com.vaadin.ui.Button.ClickListener;
+import com.vaadin.ui.FormLayout;
+import com.vaadin.ui.Label;
+import com.vaadin.ui.LoginForm;
+import com.vaadin.ui.LoginForm.LoginEvent;
+import com.vaadin.ui.LoginForm.LoginListener;
+import com.vaadin.ui.ProgressIndicator;
+import com.vaadin.ui.TabSheet;
+import com.vaadin.ui.Window;
+
+import de.dhbw.horb.calendar.ui.LoginWorker.LoginWorkerListener;
+
+public class MyApplication extends Application {
+	private static final long serialVersionUID = 1L;
+
+	@Override
+	public void init() {
+		setMainWindow(new MyMainWindow());
+	}
+
+	public static class MyMainWindow extends Window {
+		private static final long serialVersionUID = 1L;
+		private TabSheet tabSheet = new TabSheet();
+		private LoginComponent loginComponent;
+		private StundenplanComponent stundenplanComponent;
+		private LogoutComponent logoutComponent;
+		private String password = "";
+		private String username = "";
+		{
+			{
+				loginComponent = new LoginComponent(this);
+				stundenplanComponent = new StundenplanComponent(this);
+				logoutComponent = new LogoutComponent(this);
+			}
+		}
+
+		public MyMainWindow() {
+			super("DHBW Calendar");
+			tabSheet.addTab(loginComponent, "Login", null);
+			addComponent(tabSheet);
+		}
+
+		public void login(String username, String password) {
+			this.username = username;
+			this.password = password;
+			tabSheet.removeTab(tabSheet.getTab(loginComponent));
+
+			tabSheet.addTab(stundenplanComponent, "Stundenplan", null);
+			tabSheet.addTab(logoutComponent, "Logout", null);
+		}
+
+		public void logout() {
+			this.username = this.password = "";
+			tabSheet.removeTab(tabSheet.getTab(stundenplanComponent));
+			tabSheet.removeTab(tabSheet.getTab(logoutComponent));
+
+			tabSheet.addTab(loginComponent, "Login", null);
+		}
+
+		public String getUsername() {
+			return username;
+		}
+
+		public String getPassword() {
+			return password;
+		}
+	}
+
+	private static class LogoutComponent extends FormLayout {
+		private static final long serialVersionUID = 1L;
+
+		private final MyMainWindow mainWindow;
+
+		public LogoutComponent(MyMainWindow mainWindow) {
+			this.mainWindow = mainWindow;
+			Button logoutButton = new Button("Logout");
+			logoutButton.addListener(new ClickListener() {
+				private static final long serialVersionUID = 1L;
+
+				@Override
+				public void buttonClick(ClickEvent event) {
+					LogoutComponent.this.mainWindow.logout();
+				}
+			});
+			addComponent(logoutButton);
+		}
+	}
+
+	private static class LoginComponent extends FormLayout {
+		private static final long serialVersionUID = 1L;
+
+		private final MyMainWindow mainWindow;
+		private final DualisLoginForm loginForm;
+		private final Label labelDescription;
+		private final ProgressIndicator progressIndicator;
+		private final LoginWorkerListener loginWorkerListener;
+		{
+			{
+				loginForm = new DualisLoginForm();
+				labelDescription = new Label("");
+				
+				progressIndicator = new ProgressIndicator();
+				progressIndicator.setVisible(false);
+				progressIndicator.setSizeFull();
+				
+				loginWorkerListener = new LoginWorkerListener() {
+
+					@Override
+					public void success(String username, String password) {
+						mainWindow.login(username, password);
+						labelDescription.setValue("");
+						progressIndicator.setVisible(false);
+						loginForm.setVisible(true);
+					}
+
+					@Override
+					public void setProgress(double d, String description) {
+						progressIndicator.setValue(new Float(d));
+						labelDescription.setValue(description);
+					}
+
+					@Override
+					public void error(Exception e) {
+						progressIndicator.setVisible(false);
+						labelDescription.setValue("Fehler: " + e.getMessage());
+						loginForm.setVisible(true);
+					}
+				};
+			}
+		}
+
+		public LoginComponent(final MyMainWindow mainWindow) {
+			this.mainWindow = mainWindow;
+			
+			loginForm.addListener(new LoginListener() {
+				private static final long serialVersionUID = 1L;
+
+				@Override
+				public void onLogin(LoginEvent event) {
+					new Thread(new LoginWorker(loginWorkerListener, event
+							.getLoginParameter("username"), event
+							.getLoginParameter("password"))).start();
+					loginForm.setVisible(false);
+					progressIndicator.setVisible(true);
+				}
+			});
+			addComponent(loginForm);
+			addComponent(labelDescription);
+			addComponent(progressIndicator);
+		}
+	}
+
+	private static class DualisLoginForm extends LoginForm {
+		private static final long serialVersionUID = 1L;
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/de/dhbw/horb/calendar/ui/StundenplanComponent.java b/src/main/java/de/dhbw/horb/calendar/ui/StundenplanComponent.java
new file mode 100644
index 0000000..ba3cc1c
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/ui/StundenplanComponent.java
@@ -0,0 +1,102 @@
+package de.dhbw.horb.calendar.ui;
+
+import java.util.Date;
+
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Button.ClickEvent;
+import com.vaadin.ui.Button.ClickListener;
+import com.vaadin.ui.Alignment;
+import com.vaadin.ui.FormLayout;
+import com.vaadin.ui.ProgressIndicator;
+import com.vaadin.ui.Table;
+import com.vaadin.ui.VerticalLayout;
+
+import de.dhbw.horb.calendar.dualis.DualisConnection;
+import de.dhbw.horb.calendar.ics.VEvent;
+import de.dhbw.horb.calendar.ui.MyApplication.MyMainWindow;
+
+public class StundenplanComponent extends FormLayout {
+	private static final long serialVersionUID = 1L;
+
+	private ClickListener buttonFetchListener = new ClickListener() {
+		private static final long serialVersionUID = 1L;
+
+		@Override
+		public void buttonClick(ClickEvent event) {
+			table.removeAllItems();
+			table.setEnabled(false);
+			buttonFetch.setVisible(false);
+			StundenplanComponent.this.addComponentAsFirst(refresher);
+
+			new Thread() {
+				public void run() {
+					DualisConnection dualisConnection = new DualisConnection(
+							myMainWindow.getUsername(),
+							myMainWindow.getPassword());
+					try {
+						for (VEvent vevent : dualisConnection.getEvents()) {
+							synchronized (getApplication()) {
+								table.addItem(new Object[] { vevent.dtstart,
+										vevent.dtend, vevent.summary,
+										vevent.location },
+										vevent.dtstart.getTime());
+							}
+						}
+					} catch (Exception e) {
+						e.printStackTrace();
+						table.addItem(new Object[] { new Date(), new Date(),
+								"Fehler", e.getMessage() });
+					}
+					synchronized (getApplication()) {
+						buttonFetch.setVisible(true);
+						table.setEnabled(true);
+						StundenplanComponent.this.removeComponent(refresher);
+					}
+				};
+			}.start();
+		}
+	};
+
+	private final Button buttonFetch = new Button("Kalender holen",
+			buttonFetchListener);
+
+	/**
+	 * The Progress Indicator have no real sense. Its used to force the client
+	 * to poll all 500ms for new events
+	 */
+	final ProgressIndicator refresher = new ProgressIndicator();
+	{
+		{
+			refresher.setPollingInterval(500);
+			refresher.setSizeFull();
+		}
+	}
+
+	private final Table table = new Table("Stundenplan");
+	{
+		{
+			table.setSizeFull();
+			table.setSelectable(true);
+			table.addContainerProperty("begin", Date.class, "");
+			table.addContainerProperty("end", Date.class, "");
+			table.addContainerProperty("summary", String.class, "");
+			table.addContainerProperty("location", String.class, "");
+		}
+	}
+
+	private final MyMainWindow myMainWindow;
+
+	public StundenplanComponent(MyMainWindow myMainWindow) {
+		this.myMainWindow = myMainWindow;
+
+		VerticalLayout layout = new VerticalLayout();
+		layout.addComponent(buttonFetch);
+		layout.addComponent(table);
+		layout.setSizeFull();
+
+		addComponent(layout);
+		layout.setComponentAlignment(
+				buttonFetch,
+				Alignment.MIDDLE_CENTER);
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/de/dhbw/horb/calendar/util/AuthenticatedServlet.java b/src/main/java/de/dhbw/horb/calendar/util/AuthenticatedServlet.java
new file mode 100644
index 0000000..47ca537
--- /dev/null
+++ b/src/main/java/de/dhbw/horb/calendar/util/AuthenticatedServlet.java
@@ -0,0 +1,84 @@
+package de.dhbw.horb.calendar.util;
+
+import java.io.IOException;
+import java.util.StringTokenizer;
+
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.commons.lang.StringEscapeUtils;
+
+import sun.misc.BASE64Decoder;
+
+public abstract class AuthenticatedServlet extends HttpServlet {
+	private static final long serialVersionUID = 1L;
+	
+	
+	private String loginRealm = "Servlet Login";
+
+	public void setLoginRealm(String loginRealm) {
+		this.loginRealm = loginRealm;
+	}
+
+	public String getLoginRealm() {
+		return loginRealm;
+	}
+
+	String[] getUsernamePassword(HttpServletRequest request) throws IOException {
+		String authHeader = request.getHeader("Authorization");
+		if (authHeader != null) {
+			StringTokenizer st = new StringTokenizer(authHeader);
+			if (st.hasMoreTokens()) {
+				String basic = st.nextToken();
+				if (basic.equalsIgnoreCase("Basic")) {
+					String credentials = st.nextToken();
+
+					// XXX fixme, dont use sun.misc
+					BASE64Decoder decoder = new BASE64Decoder();
+					String userPass = new String(
+							decoder.decodeBuffer(credentials));
+
+					// The decoded string is in the form
+					// "userID:password".
+					int p = userPass.indexOf(":");
+					if (p != -1) {
+						String username = userPass.substring(0, p).trim();
+						String password = userPass.substring(p + 1).trim();
+						String[] userPassword = new String[] { username,
+								password };
+						if ("".equals(userPassword) || "".equals(password)) {
+							return null;
+						} else {
+							return new String[] { username, password };
+						}
+					}
+				}
+			}
+		}
+		return null;
+	}
+
+	void writeAuthenticationRequest(HttpServletResponse response) {
+		String realm = StringEscapeUtils.escapeJava(getLoginRealm());
+		String s = "Basic realm=\"" + realm + "\"";
+		response.setHeader("WWW-Authenticate", s);
+		response.setStatus(401);
+	}
+
+	@Override
+	protected void doGet(HttpServletRequest request,
+			HttpServletResponse response) throws ServletException, IOException {
+
+		String[] usernamePassword = getUsernamePassword(request);
+		if (usernamePassword == null) {
+			writeAuthenticationRequest(response);
+			return;
+		}
+		doGet(request, response, usernamePassword[0], usernamePassword[1]);
+	}
+
+	protected abstract void doGet(HttpServletRequest request,
+			HttpServletResponse response, String username, String password) throws ServletException, IOException;
+}