steps toward simpler widgetset creation. Still needs a lot of cleaning and refining.

svn changeset:8930/svn branch:2009-09-widget-packaging_3332

build/build.xml

@@ -793,6 +793,7 @@
 			<classpath>
 				<pathelement location="${gwt-dir}/${platform}/gwt-user.jar" />
 				<pathelement location="${gwt-dir}/${platform}/${lib-gwt-dev}" />
+				<pathelement location="build/classes" />
 				<pathelement location="${result-path}/src" />
 			</classpath>
 		</java>
@@ -815,6 +816,7 @@
 				<pathelement location="${gwt-dir}/${platform}/gwt-user.jar" />
 				<pathelement location="${gwt-dir}/${platform}/${lib-gwt-dev}" />
 				<pathelement location="${result-path}/src" />
+				<pathelement location="build/classes" />
 			</classpath>
 		</java>
 		<antcall target="remove-widgetset-gwt-tmp"/>
@@ -845,6 +847,7 @@
 				<pathelement location="${googlemaps-jar}" />
 				<!-- demo widgetset sources -->
 				<pathelement path="${output-dir}/WebContent/WEB-INF/src" />
+				<pathelement location="build/classes" />
 			</classpath>
 		</java>
 		<antcall target="remove-widgetset-gwt-tmp"/>
@@ -868,6 +871,7 @@
 				<pathelement location="${result-path}/src" />
 				<!-- demo widgetset sources -->
 				<pathelement path="${output-dir}/WebContent/WEB-INF/src" />
+				<pathelement location="build/classes" />
 			</classpath>
 		</java>
 		<antcall target="remove-widgetset-gwt-tmp"/>
@@ -890,6 +894,7 @@
 				<pathelement location="${result-path}/src" />
 				<!-- demo widgetset sources -->
 				<pathelement path="${output-dir}/WebContent/WEB-INF/src" />
+				<pathelement location="build/classes" />
 			</classpath>
 		</java>
 		<antcall target="remove-widgetset-gwt-tmp"/>
@@ -912,6 +917,7 @@
 				<pathelement location="${result-path}/src" />
 				<!-- demo widgetset sources -->
 				<pathelement path="${output-dir}/WebContent/WEB-INF/src" />
+				<pathelement location="build/classes" />
 			</classpath>
 		</java>
 		<antcall target="remove-widgetset-gwt-tmp"/>

src/com/vaadin/demo/colorpicker/ColorPicker.java

@@ -6,11 +6,14 @@ package com.vaadin.demo.colorpicker;
 
 import java.util.Map;
 
+import com.vaadin.demo.colorpicker.gwt.client.ui.VColorPicker;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.ui.AbstractField;
+import com.vaadin.ui.ClientWidget;
 
 @SuppressWarnings("serial")
+@ClientWidget(VColorPicker.class)
 public class ColorPicker extends AbstractField {
 
     public ColorPicker() {

src/com/vaadin/demo/colorpicker/gwt/ColorPickerWidgetSet.gwt.xml

@@ -1,11 +1,8 @@
 <module>
 	<!-- Inherit DefaultWidgetSet -->
-	<inherits name="com.vaadin.terminal.gwt.DefaultWidgetSet" /> 
+	<inherits name="com.vaadin.terminal.gwt.DefaultWidgetSet" /> 
 	
 	<!-- WidgetSet default theme -->	
 	<stylesheet src="colorpicker/styles.css"/>
 
-	<!-- Entry point -->
-	<entry-point class="com.vaadin.demo.colorpicker.gwt.client.ColorPickerWidgetSet"/>
-  
 </module>

src/com/vaadin/demo/colorpicker/gwt/client/ColorPickerWidgetSet.java

@@ -1,36 +0,0 @@
-/* 
-@ITMillApache2LicenseForJavaFiles@
- */
-
-package com.vaadin.demo.colorpicker.gwt.client;
-
-import com.vaadin.demo.colorpicker.gwt.client.ui.VColorPicker;
-import com.vaadin.terminal.gwt.client.DefaultWidgetSet;
-import com.vaadin.terminal.gwt.client.Paintable;
-import com.vaadin.terminal.gwt.client.UIDL;
-
-public class ColorPickerWidgetSet extends DefaultWidgetSet {
-    /** Resolves UIDL tag name to widget class. */
-    @Override
-    protected Class<?> resolveWidgetType(UIDL uidl) {
-        final String tag = uidl.getTag();
-        if ("colorpicker".equals(tag)) {
-            return VColorPicker.class;
-        }
-
-        // Let the DefaultWidgetSet handle resolution of default widgets
-        return super.resolveWidgetType(uidl);
-    }
-
-    /** Creates a widget instance according to its class object. */
-    @Override
-    public Paintable createWidget(UIDL uidl) {
-        final Class<?> type = resolveWidgetType(uidl);
-        if (VColorPicker.class == type) {
-            return new VColorPicker();
-        }
-
-        // Let the DefaultWidgetSet handle creation of default widgets
-        return super.createWidget(uidl);
-    }
-}

src/com/vaadin/demo/coverflow/Coverflow.java

@@ -4,11 +4,14 @@
 
 package com.vaadin.demo.coverflow;
 
+import com.vaadin.demo.coverflow.gwt.client.ui.VCoverflow;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.ui.AbstractSelect;
+import com.vaadin.ui.ClientWidget;
 
 @SuppressWarnings( { "serial", "unchecked" })
+@ClientWidget(VCoverflow.class)
 public class Coverflow extends AbstractSelect {
 
     private String backgroundGradientStart = "FFFFFF";

src/com/vaadin/demo/coverflow/gwt/CoverflowWidgetSet.gwt.xml

@@ -1,8 +1,5 @@
 <module>
 	<!-- Inherit the NoEntry version to avoid multiple entrypoints -->
-	<inherits name="com.vaadin.terminal.gwt.DefaultWidgetSetNoEntry" /> 
-
-	<!-- Entry point -->
-	<entry-point class="com.vaadin.demo.coverflow.gwt.client.CoverflowWidgetSet"/>
+	<inherits name="com.vaadin.terminal.gwt.DefaultWidget" /> 
   
 </module>

src/com/vaadin/demo/coverflow/gwt/client/CoverflowWidgetSet.java

@@ -1,36 +0,0 @@
-/* 
-@ITMillApache2LicenseForJavaFiles@
- */
-
-package com.vaadin.demo.coverflow.gwt.client;
-
-import com.vaadin.demo.coverflow.gwt.client.ui.VCoverflow;
-import com.vaadin.terminal.gwt.client.DefaultWidgetSet;
-import com.vaadin.terminal.gwt.client.Paintable;
-import com.vaadin.terminal.gwt.client.UIDL;
-
-public class CoverflowWidgetSet extends DefaultWidgetSet {
-    /** Creates a widget according to its class name. */
-    @Override
-    public Paintable createWidget(UIDL uidl) {
-        final Class<?> classType = resolveWidgetType(uidl);
-        if (VCoverflow.class == classType) {
-            return new VCoverflow();
-        }
-
-        // Let the DefaultWidgetSet handle creation of default widgets
-        return super.createWidget(uidl);
-    }
-
-    /** Resolves UIDL tag name to class . */
-    @Override
-    protected Class<?> resolveWidgetType(UIDL uidl) {
-        final String tag = uidl.getTag();
-        if ("cover".equals(tag)) {
-            return VCoverflow.class;
-        }
-
-        // Let the DefaultWidgetSet handle resolution of default widgets
-        return super.resolveWidgetType(uidl);
-    }
-}

src/com/vaadin/demo/reservation/CalendarField.java

@@ -12,14 +12,17 @@ import java.util.Iterator;
 import com.vaadin.data.Container;
 import com.vaadin.data.Item;
 import com.vaadin.data.Property;
+import com.vaadin.demo.reservation.gwt.client.ui.VCalendarField;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.ui.ClientWidget;
 import com.vaadin.ui.DateField;
 
 // TODO send one month at a time, do lazyLoading
 // TODO check date limit when updating variables
 // TODO Allow item selection
 @SuppressWarnings("serial")
+@ClientWidget(VCalendarField.class)
 public class CalendarField extends DateField implements Container.Viewer {
 
     private static final String TAGNAME = "calendarfield";

src/com/vaadin/demo/reservation/GoogleMap.java

@@ -12,12 +12,15 @@ import com.vaadin.data.Container;
 import com.vaadin.data.Item;
 import com.vaadin.data.Property;
 import com.vaadin.data.util.IndexedContainer;
+import com.vaadin.demo.reservation.gwt.client.ui.VGoogleMap;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Sizeable;
 import com.vaadin.ui.AbstractComponent;
+import com.vaadin.ui.ClientWidget;
 
 @SuppressWarnings("serial")
+@ClientWidget(VGoogleMap.class)
 public class GoogleMap extends AbstractComponent implements Sizeable,
         Container.Viewer {
     private final String TAG_MARKERS = "markers";

src/com/vaadin/demo/reservation/gwt/ReservationWidgetSet.gwt.xml

@@ -23,7 +23,4 @@
 	<!-- Using key for http://demo.vaadin.com: -->
 	<script src="http://maps.google.com/maps?gwt=1&amp;file=api&amp;v=2.x&amp;key=ABQIAAAAP3UBMIhn15mgO6uIqO_GVRTjfRw0y7NvUKCc8_UnYaOyzzWA_xRoBYGzLMNrw-8-IesNKDC1WFd_vg" />
 
-	<!-- Entry point -->
-	<entry-point class="com.vaadin.demo.reservation.gwt.client.ReservationWidgetSet"/>
-  
 </module>

src/com/vaadin/demo/reservation/gwt/client/ReservationWidgetSet.java

@@ -1,37 +0,0 @@
-/* 
-@ITMillApache2LicenseForJavaFiles@
- */
-
-package com.vaadin.demo.reservation.gwt.client;
-
-import com.vaadin.demo.reservation.gwt.client.ui.VCalendarField;
-import com.vaadin.demo.reservation.gwt.client.ui.VGoogleMap;
-import com.vaadin.terminal.gwt.client.DefaultWidgetSet;
-import com.vaadin.terminal.gwt.client.Paintable;
-import com.vaadin.terminal.gwt.client.UIDL;
-
-public class ReservationWidgetSet extends DefaultWidgetSet {
-    @Override
-    public Paintable createWidget(UIDL uidl) {
-        final Class<?> type = resolveWidgetType(uidl);
-        if (VGoogleMap.class == type) {
-            return new VGoogleMap();
-        } else if (VCalendarField.class == type) {
-            return new VCalendarField();
-        }
-
-        return super.createWidget(uidl);
-    }
-
-    @Override
-    protected Class<?> resolveWidgetType(UIDL uidl) {
-        final String tag = uidl.getTag();
-        if ("googlemap".equals(tag)) {
-            return VGoogleMap.class;
-        } else if ("calendarfield".equals(tag)) {
-            return VCalendarField.class;
-        }
-        return super.resolveWidgetType(uidl);
-    }
-
-}

src/com/vaadin/demo/sampler/ActiveLink.java

@@ -5,14 +5,17 @@ import java.lang.reflect.Method;
 import java.util.HashSet;
 import java.util.Map;
 
+import com.vaadin.demo.sampler.gwt.client.ui.VActiveLink;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
+import com.vaadin.ui.ClientWidget;
 import com.vaadin.ui.Component;
 import com.vaadin.ui.Link;
 import com.vaadin.ui.Button.ClickEvent;
 
 @SuppressWarnings("serial")
+@ClientWidget(VActiveLink.class)
 public class ActiveLink extends Link {
 
     private static final String TAG = "activelink";

src/com/vaadin/demo/sampler/CodeLabel.java

@@ -1,7 +1,10 @@
 package com.vaadin.demo.sampler;
 
+import com.vaadin.demo.sampler.gwt.client.ui.VCodeLabel;
+import com.vaadin.ui.ClientWidget;
 import com.vaadin.ui.Label;
 
+@ClientWidget(VCodeLabel.class)
 @SuppressWarnings("serial")
 public class CodeLabel extends Label {
 

src/com/vaadin/demo/sampler/GoogleAnalytics.java

@@ -1,10 +1,13 @@
 package com.vaadin.demo.sampler;
 
+import com.vaadin.demo.sampler.gwt.client.ui.VGoogleAnalytics;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.ui.AbstractComponent;
+import com.vaadin.ui.ClientWidget;
 
 @SuppressWarnings("serial")
+@ClientWidget(VGoogleAnalytics.class)
 public class GoogleAnalytics extends AbstractComponent {
 
     private String trackerId;

src/com/vaadin/demo/sampler/gwt/SamplerWidgetSet.gwt.xml

@@ -9,7 +9,4 @@
 	<stylesheet src="prettify/prettify.css"/>
 	<script src="prettify/prettify.js" />
 
-	<!-- Entry point -->
-	<entry-point class="com.vaadin.demo.sampler.gwt.client.SamplerWidgetSet"/>
-  
 </module>

src/com/vaadin/demo/sampler/gwt/client/SamplerWidgetSet.java

@@ -1,40 +0,0 @@
-package com.vaadin.demo.sampler.gwt.client;
-
-import com.vaadin.demo.sampler.gwt.client.ui.VActiveLink;
-import com.vaadin.demo.sampler.gwt.client.ui.VCodeLabel;
-import com.vaadin.demo.sampler.gwt.client.ui.VGoogleAnalytics;
-import com.vaadin.terminal.gwt.client.DefaultWidgetSet;
-import com.vaadin.terminal.gwt.client.Paintable;
-import com.vaadin.terminal.gwt.client.UIDL;
-
-public class SamplerWidgetSet extends DefaultWidgetSet {
-
-    @Override
-    public Paintable createWidget(UIDL uidl) {
-        final Class<?> classType = resolveWidgetType(uidl);
-        if (VGoogleAnalytics.class == classType) {
-            return new VGoogleAnalytics();
-        } else if (VCodeLabel.class == classType) {
-            return new VCodeLabel();
-        } else if (VActiveLink.class == classType) {
-            return new VActiveLink();
-        } else {
-            return super.createWidget(uidl);
-        }
-    }
-
-    @Override
-    protected Class<?> resolveWidgetType(UIDL uidl) {
-        final String tag = uidl.getTag();
-        if ("googleanalytics".equals(tag)) {
-            return VGoogleAnalytics.class;
-        } else if ("codelabel".equals(tag)) {
-            return VCodeLabel.class;
-        } else if ("activelink".equals(tag)) {
-            return VActiveLink.class;
-        } else {
-            return super.resolveWidgetType(uidl);
-        }
-    }
-
-}

src/com/vaadin/portal/gwt/PortalDefaultWidgetSet.gwt.xml

@@ -1,8 +1,4 @@
 <module>
 	<!-- Inherit the SamplerWidgetSet -->
 	<inherits name="com.vaadin.demo.sampler.gwt.SamplerWidgetSet" />
-
-	<!-- Entry point -->
-	<entry-point class="com.vaadin.portal.gwt.client.PortalDefaultWidgetSet"/>
-	
 </module>

src/com/vaadin/portal/gwt/client/PortalDefaultWidgetSet.java

@@ -1,7 +0,0 @@
-package com.vaadin.portal.gwt.client;
-
-import com.vaadin.demo.sampler.gwt.client.SamplerWidgetSet;
-
-public class PortalDefaultWidgetSet extends SamplerWidgetSet {
-
-}

src/com/vaadin/terminal/PaintTarget.java

@@ -390,4 +390,11 @@ public interface PaintTarget extends Serializable {
     void addCharacterData(String text) throws PaintException;
 
     public void addAttribute(String string, Object[] keys);
+
+    /**
+     * @return the "tag" string used in communication to present given
+     *         {@link Paintable} type. Terminal may define how to present
+     *         paintable.
+     */
+    public String getTag(Paintable paintable);
 }

src/com/vaadin/terminal/gwt/DefaultWidgetSet.gwt.xml

@@ -22,7 +22,7 @@
 	<inherits name="com.google.gwt.xml.XML" />
 
 	<inherits name="com.google.gwt.json.JSON" />
-
+	
 	<source path="client" />
 	
 	<!-- Use our own history impl for IE to workaround #2931.	--> 
@@ -31,5 +31,10 @@
 		<when-property-is name="user.agent" value="ie6"/>
 	</replace-with>
 
+	<generate-with class="com.vaadin.terminal.gwt.rebind.WidgetMapGenerator">
+		<when-type-is class="com.vaadin.terminal.gwt.client.WidgetMap"/>
+	</generate-with>
+	
 	<entry-point class="com.vaadin.terminal.gwt.client.DefaultWidgetSet" />
+	
 </module>

src/com/vaadin/terminal/gwt/DefaultWidgetSetNoEntry.gwt.xml

@@ -1,6 +0,0 @@
-<module>
-	<!--
-		"NoEntry" -concept deprecated, inherit DefaultWidgetSet instead.
-	-->
-	<inherits name="com.vaadin.terminal.gwt.DefaultWidgetSet" />
-</module>

src/com/vaadin/terminal/gwt/client/ApplicationConfiguration.java

@@ -6,6 +6,8 @@ import java.util.List;
 
 import com.google.gwt.core.client.GWT;
 import com.google.gwt.core.client.JavaScriptObject;
+import com.google.gwt.core.client.JsArrayString;
+import com.vaadin.terminal.gwt.client.ui.VUnknownComponent;
 
 public class ApplicationConfiguration {
 
@@ -23,6 +25,8 @@ public class ApplicationConfiguration {
     private String communicationErrorUrl;
     private boolean useDebugIdInDom = true;
 
+    private Class<? extends Paintable>[] classes = new Class[1024];
+
     private static ArrayList<ApplicationConnection> unstartedApplications = new ArrayList<ApplicationConnection>();
     private static ArrayList<ApplicationConnection> runningApplications = new ArrayList<ApplicationConnection>();
 
@@ -118,13 +122,13 @@ public class ApplicationConfiguration {
         int lastdot = module.lastIndexOf(".");
         String base = module.substring(0, lastdot);
         String simpleName = module.substring(lastdot + 1);
-        if (!wsname.startsWith(base) || !wsname.endsWith(simpleName)) {
-            // WidgetSet module name does not match implementation name;
-            // probably inherited WidgetSet with entry-point. Skip.
-            GWT.log("Ignored init for " + wsname + " when starting " + module,
-                    null);
-            return;
-        }
+        // if (!wsname.startsWith(base) || !wsname.endsWith(simpleName)) {
+        // // WidgetSet module name does not match implementation name;
+        // // probably inherited WidgetSet with entry-point. Skip.
+        // GWT.log("Ignored init for " + wsname + " when starting " + module,
+        // null);
+        // return;
+        // }
 
         if (initedWidgetSet != null) {
             // Something went wrong: multiple widgetsets inited
@@ -198,4 +202,24 @@ public class ApplicationConfiguration {
     public boolean useDebugIdInDOM() {
         return useDebugIdInDom;
     }
+
+    public Class<? extends Paintable> getWidgetClassByEncodedTag(String tag) {
+        try {
+            int parseInt = Integer.parseInt(tag);
+            return classes[parseInt];
+        } catch (Exception e) {
+            // component was not present in mappings
+            return VUnknownComponent.class;
+        }
+    }
+
+    public void addComponentMappings(ValueMap valueMap, WidgetSet widgetSet) {
+        JsArrayString keyArray = valueMap.getKeyArray();
+        for (int i = 0; i < keyArray.length(); i++) {
+            String key = keyArray.get(i);
+            int value = valueMap.getInt(key);
+            classes[value] = widgetSet.getImplementationByClassName(key);
+        }
+    }
+
 }

src/com/vaadin/terminal/gwt/client/ApplicationConnection.java

@@ -20,7 +20,6 @@ import com.google.gwt.http.client.RequestBuilder;
 import com.google.gwt.http.client.RequestCallback;
 import com.google.gwt.http.client.RequestException;
 import com.google.gwt.http.client.Response;
-import com.google.gwt.json.client.JSONArray;
 import com.google.gwt.user.client.Command;
 import com.google.gwt.user.client.DOM;
 import com.google.gwt.user.client.DeferredCommand;
@@ -607,7 +606,11 @@ public class ApplicationConnection {
 
     private static native ValueMap parseJSONResponse(String jsonText)
     /*-{
-        return eval('(' + jsonText + ')');
+        if(JSON && JSON.parse) {
+            return JSON.parse(jsonText);
+        } else {
+            return eval('(' + jsonText + ')');
+        }
      }-*/;
 
     private void handleReceivedJSONMessage(Response response) {
@@ -618,12 +621,17 @@ public class ApplicationConnection {
         ValueMap json;
         try {
             json = parseJSONResponse(jsonText);
-        } catch (final com.google.gwt.json.client.JSONException e) {
+        } catch (final Exception e) {
             endRequest();
             showCommunicationError(e.getMessage() + " - Original JSON-text:");
             console.log(jsonText);
             return;
         }
+
+        ApplicationConnection.getConsole()
+                .log(
+                        "JSON parsing took "
+                                + (new Date().getTime() - start.getTime()));
         // Handle redirect
         if (json.containsKey("redirect")) {
             String url = json.getValueMap("redirect").getString("url");
@@ -642,6 +650,11 @@ public class ApplicationConnection {
             }
         }
 
+        if (json.containsKey("typeMappings")) {
+            configuration.addComponentMappings(
+                    json.getValueMap("typeMappings"), widgetSet);
+        }
+
         if (json.containsKey("locales")) {
             // Store locale data
             JsArray<ValueMap> valueMapArray = json
@@ -707,7 +720,7 @@ public class ApplicationConnection {
                     updatedWidgets.add(idToPaintableDetail.get(uidl.getId())
                             .getComponent());
                 } else {
-                    if (!uidl.getTag().equals("window")) {
+                    if (!uidl.getTag().equals("0")) {
                         ClientExceptionHandler
                                 .displayError("Received update for "
                                         + uidl.getTag()
@@ -790,10 +803,6 @@ public class ApplicationConnection {
         endRequest();
     }
 
-    private UIDL getUidl(JSONArray changes, int i) {
-        return (UIDL) changes.get(i).isArray().getJavaScriptObject();
-    }
-
     /**
      * This method assures that all pending variable changes are sent to server.
      * Method uses synchronized xmlhttprequest and does not return before the
@@ -1112,10 +1121,11 @@ public class ApplicationConnection {
         }
 
         // Switch to correct implementation if needed
-        if (!widgetSet.isCorrectImplementation(component, uidl)) {
+        if (!widgetSet.isCorrectImplementation(component, uidl, configuration)) {
             final Container parent = Util.getLayout(component);
             if (parent != null) {
-                final Widget w = (Widget) widgetSet.createWidget(uidl);
+                final Widget w = (Widget) widgetSet.createWidget(uidl,
+                        configuration);
                 parent.replaceChildComponent(component, w);
                 unregisterPaintable((Paintable) component);
                 registerPaintable(uidl.getId(), (Paintable) w);
@@ -1511,7 +1521,7 @@ public class ApplicationConnection {
         if (w != null) {
             return w;
         } else {
-            w = widgetSet.createWidget(uidl);
+            w = widgetSet.createWidget(uidl, configuration);
             registerPaintable(id, w);
             return w;
 
@@ -1750,4 +1760,8 @@ public class ApplicationConnection {
         componentDetail.putAdditionalTooltip(key, tooltip);
     }
 
+    public ApplicationConfiguration getConfiguration() {
+        return configuration;
+    }
+
 }

src/com/vaadin/terminal/gwt/client/DefaultWidgetSet.java

@@ -4,287 +4,115 @@
 
 package com.vaadin.terminal.gwt.client;
 
+import com.google.gwt.core.client.GWT;
 import com.google.gwt.user.client.ui.Widget;
-import com.vaadin.terminal.gwt.client.ui.VAbsoluteLayout;
-import com.vaadin.terminal.gwt.client.ui.VAccordion;
 import com.vaadin.terminal.gwt.client.ui.VButton;
 import com.vaadin.terminal.gwt.client.ui.VCheckBox;
-import com.vaadin.terminal.gwt.client.ui.VCustomComponent;
-import com.vaadin.terminal.gwt.client.ui.VCustomLayout;
 import com.vaadin.terminal.gwt.client.ui.VDateFieldCalendar;
-import com.vaadin.terminal.gwt.client.ui.VEmbedded;
 import com.vaadin.terminal.gwt.client.ui.VFilterSelect;
-import com.vaadin.terminal.gwt.client.ui.VCssLayout;
-import com.vaadin.terminal.gwt.client.ui.VForm;
-import com.vaadin.terminal.gwt.client.ui.VFormLayout;
-import com.vaadin.terminal.gwt.client.ui.VGridLayout;
-import com.vaadin.terminal.gwt.client.ui.VHorizontalLayout;
-import com.vaadin.terminal.gwt.client.ui.VLabel;
-import com.vaadin.terminal.gwt.client.ui.VLink;
 import com.vaadin.terminal.gwt.client.ui.VListSelect;
-import com.vaadin.terminal.gwt.client.ui.VMenuBar;
-import com.vaadin.terminal.gwt.client.ui.VNativeButton;
 import com.vaadin.terminal.gwt.client.ui.VNativeSelect;
 import com.vaadin.terminal.gwt.client.ui.VOptionGroup;
-import com.vaadin.terminal.gwt.client.ui.VOrderedLayout;
-import com.vaadin.terminal.gwt.client.ui.VPanel;
 import com.vaadin.terminal.gwt.client.ui.VPasswordField;
 import com.vaadin.terminal.gwt.client.ui.VPopupCalendar;
-import com.vaadin.terminal.gwt.client.ui.VPopupView;
-import com.vaadin.terminal.gwt.client.ui.VProgressIndicator;
-import com.vaadin.terminal.gwt.client.ui.VScrollTable;
-import com.vaadin.terminal.gwt.client.ui.VSlider;
 import com.vaadin.terminal.gwt.client.ui.VSplitPanelHorizontal;
 import com.vaadin.terminal.gwt.client.ui.VSplitPanelVertical;
-import com.vaadin.terminal.gwt.client.ui.VTablePaging;
-import com.vaadin.terminal.gwt.client.ui.VTabsheet;
 import com.vaadin.terminal.gwt.client.ui.VTextArea;
 import com.vaadin.terminal.gwt.client.ui.VTextField;
-import com.vaadin.terminal.gwt.client.ui.VTextualDate;
-import com.vaadin.terminal.gwt.client.ui.VTree;
 import com.vaadin.terminal.gwt.client.ui.VTwinColSelect;
 import com.vaadin.terminal.gwt.client.ui.VUnknownComponent;
-import com.vaadin.terminal.gwt.client.ui.VUpload;
-import com.vaadin.terminal.gwt.client.ui.VUriFragmentUtility;
-import com.vaadin.terminal.gwt.client.ui.VVerticalLayout;
+import com.vaadin.terminal.gwt.client.ui.VView;
 import com.vaadin.terminal.gwt.client.ui.VWindow;
-import com.vaadin.terminal.gwt.client.ui.richtextarea.VRichTextArea;
 
 public class DefaultWidgetSet implements WidgetSet {
 
+    /**
+     * DefaultWidgetSet (and its extensions) delegate instantiation of widgets
+     * and client-server mathing to WidgetMap. The actual implementations are
+     * generated with gwts deferred binding.
+     */
+    private WidgetMap map;
+
     /**
      * This is the entry point method. It will start the first
      */
     public void onModuleLoad() {
         ApplicationConfiguration.initConfigurations(this);
         ApplicationConfiguration.startNextApplication(); // start first app
+        map = GWT.create(WidgetMap.class);
     }
 
-    public Paintable createWidget(UIDL uidl) {
-        final Class classType = resolveWidgetType(uidl);
-        if (VCheckBox.class == classType) {
-            return new VCheckBox();
-        } else if (VButton.class == classType) {
-            return new VButton();
-        } else if (VNativeButton.class == classType) {
-            return new VNativeButton();
-        } else if (VWindow.class == classType) {
-            return new VWindow();
-        } else if (VOrderedLayout.class == classType) {
-            return new VOrderedLayout();
-        } else if (VVerticalLayout.class == classType) {
-            return new VVerticalLayout();
-        } else if (VHorizontalLayout.class == classType) {
-            return new VHorizontalLayout();
-        } else if (VLabel.class == classType) {
-            return new VLabel();
-        } else if (VLink.class == classType) {
-            return new VLink();
-        } else if (VGridLayout.class == classType) {
-            return new VGridLayout();
-        } else if (VTree.class == classType) {
-            return new VTree();
-        } else if (VOptionGroup.class == classType) {
-            return new VOptionGroup();
-        } else if (VTwinColSelect.class == classType) {
-            return new VTwinColSelect();
-        } else if (VNativeSelect.class == classType) {
-            return new VNativeSelect();
-        } else if (VListSelect.class == classType) {
-            return new VListSelect();
-        } else if (VPanel.class == classType) {
-            return new VPanel();
-        } else if (VTabsheet.class == classType) {
-            return new VTabsheet();
-        } else if (VEmbedded.class == classType) {
-            return new VEmbedded();
-        } else if (VCustomLayout.class == classType) {
-            return new VCustomLayout();
-        } else if (VCustomComponent.class == classType) {
-            return new VCustomComponent();
-        } else if (VTextArea.class == classType) {
-            return new VTextArea();
-        } else if (VPasswordField.class == classType) {
-            return new VPasswordField();
-        } else if (VTextField.class == classType) {
-            return new VTextField();
-        } else if (VTablePaging.class == classType) {
-            return new VTablePaging();
-        } else if (VScrollTable.class == classType) {
-            return new VScrollTable();
-        } else if (VDateFieldCalendar.class == classType) {
-            return new VDateFieldCalendar();
-        } else if (VTextualDate.class == classType) {
-            return new VTextualDate();
-        } else if (VPopupCalendar.class == classType) {
-            return new VPopupCalendar();
-        } else if (VSlider.class == classType) {
-            return new VSlider();
-        } else if (VForm.class == classType) {
-            return new VForm();
-        } else if (VFormLayout.class == classType) {
-            return new VFormLayout();
-        } else if (VUpload.class == classType) {
-            return new VUpload();
-        } else if (VSplitPanelHorizontal.class == classType) {
-            return new VSplitPanelHorizontal();
-        } else if (VSplitPanelVertical.class == classType) {
-            return new VSplitPanelVertical();
-        } else if (VFilterSelect.class == classType) {
-            return new VFilterSelect();
-        } else if (VProgressIndicator.class == classType) {
-            return new VProgressIndicator();
-        } else if (VRichTextArea.class == classType) {
-            return new VRichTextArea();
-        } else if (VAccordion.class == classType) {
-            return new VAccordion();
-        } else if (VMenuBar.class == classType) {
-            return new VMenuBar();
-        } else if (VPopupView.class == classType) {
-            return new VPopupView();
-        } else if (VUriFragmentUtility.class == classType) {
-            return new VUriFragmentUtility();
-        } else if (VAbsoluteLayout.class == classType) {
-            return new VAbsoluteLayout();
-        } else if (VCssLayout.class == classType) {
-            return new VCssLayout();
+    public Paintable createWidget(UIDL uidl, ApplicationConfiguration conf) {
+        final Class<? extends Paintable> classType = resolveWidgetType(uidl,
+                conf);
+        if (classType == null) {
+            return new VUnknownComponent();
         }
 
-        return new VUnknownComponent();
-
+        return map.instantiate(classType);
     }
 
-    protected Class resolveWidgetType(UIDL uidl) {
+    protected Class<? extends Paintable> resolveWidgetType(UIDL uidl,
+            ApplicationConfiguration conf) {
         final String tag = uidl.getTag();
-        if ("button".equals(tag) || "nativebutton".equals(tag)) {
-            if ("switch".equals(uidl.getStringAttribute("type"))) {
-                return VCheckBox.class;
-            } else if ("nativebutton".equals(tag)) {
-                return VNativeButton.class;
-            } else {
-                return VButton.class;
-            }
-        } else if ("window".equals(tag)) {
+
+        Class<? extends Paintable> widgetClass = conf
+                .getWidgetClassByEncodedTag(tag);
+
+        // TODO add our quirks
+
+        if (widgetClass == VButton.class && uidl.hasAttribute("type")) {
+            return VCheckBox.class;
+        } else if (widgetClass == VView.class && uidl.hasAttribute("sub")) {
             return VWindow.class;
-        } else if ("orderedlayout".equals(tag)) {
-            return VOrderedLayout.class;
-        } else if ("verticallayout".equals(tag)) {
-            return VVerticalLayout.class;
-        } else if ("horizontallayout".equals(tag)) {
-            return VHorizontalLayout.class;
-        } else if ("label".equals(tag)) {
-            return VLabel.class;
-        } else if ("link".equals(tag)) {
-            return VLink.class;
-        } else if ("gridlayout".equals(tag)) {
-            return VGridLayout.class;
-        } else if ("tree".equals(tag)) {
-            return VTree.class;
-        } else if ("select".equals(tag)) {
+        } else if (widgetClass == VFilterSelect.class) {
             if (uidl.hasAttribute("type")) {
-                final String type = uidl.getStringAttribute("type");
-                if (type.equals("twincol")) {
+                // TODO check if all type checks are really neede
+                final String type = uidl.getStringAttribute("type").intern();
+                if (type == "twincol") {
                     return VTwinColSelect.class;
-                }
-                if (type.equals("optiongroup")) {
+                } else if (type == "optiongroup") {
                     return VOptionGroup.class;
-                }
-                if (type.equals("native")) {
+                } else if (type == "native") {
                     return VNativeSelect.class;
-                }
-                if (type.equals("list")) {
+                } else if (type == "list") {
                     return VListSelect.class;
-                }
-            } else {
-                if (uidl.hasAttribute("selectmode")
+                } else if (uidl.hasAttribute("selectmode")
                         && uidl.getStringAttribute("selectmode")
                                 .equals("multi")) {
                     return VListSelect.class;
-                } else {
-                    return VFilterSelect.class;
                 }
             }
-        } else if ("panel".equals(tag)) {
-            return VPanel.class;
-        } else if ("tabsheet".equals(tag)) {
-            return VTabsheet.class;
-        } else if ("accordion".equals(tag)) {
-            return VAccordion.class;
-        } else if ("embedded".equals(tag)) {
-            return VEmbedded.class;
-        } else if ("customlayout".equals(tag)) {
-            return VCustomLayout.class;
-        } else if ("customcomponent".equals(tag)) {
-            return VCustomComponent.class;
-        } else if ("textfield".equals(tag)) {
-            if (uidl.getBooleanAttribute("richtext")) {
-                return VRichTextArea.class;
-            } else if (uidl.hasAttribute("multiline")) {
+        } else if (widgetClass == VTextField.class) {
+            if (uidl.hasAttribute("multiline")) {
                 return VTextArea.class;
-            } else if (uidl.getBooleanAttribute("secret")) {
+            } else if (uidl.hasAttribute("secret")) {
                 return VPasswordField.class;
-            } else {
-                return VTextField.class;
             }
-        } else if ("table".equals(tag)) {
-            return VScrollTable.class;
-        } else if ("pagingtable".equals(tag)) {
-            return VTablePaging.class;
-        } else if ("datefield".equals(tag)) {
-            if (uidl.hasAttribute("type")) {
-                if ("inline".equals(uidl.getStringAttribute("type"))) {
-                    return VDateFieldCalendar.class;
-                } else if ("popup".equals(uidl.getStringAttribute("type"))) {
-                    return VPopupCalendar.class;
-                }
+        } else if (widgetClass == VPopupCalendar.class) {
+            if (uidl.hasAttribute("type")
+                    && uidl.getStringAttribute("type").equals("inline")) {
+                return VDateFieldCalendar.class;
             }
-            // popup calendar is the default
-            return VPopupCalendar.class;
-        } else if ("slider".equals(tag)) {
-            return VSlider.class;
-        } else if ("form".equals(tag)) {
-            return VForm.class;
-        } else if ("formlayout".equals(tag)) {
-            return VFormLayout.class;
-        } else if ("upload".equals(tag)) {
-            return VUpload.class;
-        } else if ("hsplitpanel".equals(tag)) {
-            return VSplitPanelHorizontal.class;
-        } else if ("vsplitpanel".equals(tag)) {
+        } else if (widgetClass == VSplitPanelHorizontal.class
+                && uidl.hasAttribute("vertical")) {
             return VSplitPanelVertical.class;
-        } else if ("progressindicator".equals(tag)) {
-            return VProgressIndicator.class;
-        } else if ("menubar".equals(tag)) {
-            return VMenuBar.class;
-        } else if ("popupview".equals(tag)) {
-            return VPopupView.class;
-        } else if ("urifragment".equals(tag)) {
-            return VUriFragmentUtility.class;
-        } else if (VAbsoluteLayout.TAGNAME.equals(tag)) {
-            return VAbsoluteLayout.class;
-        } else if (VCssLayout.TAGNAME.equals(tag)) {
-            return VCssLayout.class;
         }
 
-        return VUnknownComponent.class;
-    }
+        return widgetClass;
 
-    /**
-     * Kept here to support 5.2 era widget sets
-     * 
-     * @deprecated use resolveWidgetType instead
-     */
-    @Deprecated
-    protected String resolveWidgetTypeName(UIDL uidl) {
-        Class type = resolveWidgetType(uidl);
-        return type.getName();
     }
 
-    public boolean isCorrectImplementation(Widget currentWidget, UIDL uidl) {
-        // TODO remove backwardscompatibility check
-        return currentWidget.getClass() == resolveWidgetType(uidl)
-                || currentWidget.getClass().getName().equals(
-                        resolveWidgetTypeName(uidl));
+    public boolean isCorrectImplementation(Widget currentWidget, UIDL uidl,
+            ApplicationConfiguration conf) {
+        return currentWidget.getClass() == resolveWidgetType(uidl, conf);
     }
 
+    public Class<? extends Paintable> getImplementationByClassName(
+            String fullyqualifiedName) {
+        Class<? extends Paintable> implementationByServerSideClassName = map
+                .getImplementationByServerSideClassName(fullyqualifiedName);
+        return implementationByServerSideClassName;
+
+    }
 }

src/com/vaadin/terminal/gwt/client/VDebugConsole.java

@@ -70,6 +70,8 @@ public final class VDebugConsole extends VOverlay implements Console {
 
     private ApplicationConnection client;
 
+    private ApplicationConfiguration conf;
+
     private static final String help = "Drag=move, shift-drag=resize, doubleclick=min/max."
             + "Use debug=quiet to log only to browser console.";
 
@@ -78,6 +80,7 @@ public final class VDebugConsole extends VOverlay implements Console {
         super(false, false);
 
         this.client = client;
+        conf = cnf;
 
         panel = new FlowPanel();
         if (showWindow) {
@@ -292,7 +295,7 @@ public final class VDebugConsole extends VOverlay implements Console {
 
     /*
      * (non-Javadoc)
-     *
+     * 
      * @see com.vaadin.terminal.gwt.client.Console#log(java.lang.String)
      */
     public void log(String msg) {
@@ -303,7 +306,7 @@ public final class VDebugConsole extends VOverlay implements Console {
 
     /*
      * (non-Javadoc)
-     *
+     * 
      * @see com.vaadin.terminal.gwt.client.Console#error(java.lang.String)
      */
     public void error(String msg) {
@@ -314,7 +317,7 @@ public final class VDebugConsole extends VOverlay implements Console {
 
     /*
      * (non-Javadoc)
-     *
+     * 
      * @see com.vaadin.terminal.gwt.client.Console#printObject(java.lang.
      * Object)
      */
@@ -325,13 +328,13 @@ public final class VDebugConsole extends VOverlay implements Console {
 
     /*
      * (non-Javadoc)
-     *
+     * 
      * @see com.vaadin.terminal.gwt.client.Console#dirUIDL(com.vaadin
      * .terminal.gwt.client.UIDL)
      */
     public void dirUIDL(UIDL u) {
         if (panel.isAttached()) {
-            panel.add(new VUIDLBrowser(u));
+            panel.add(new VUIDLBrowser(u, conf));
         }
         consoleDir(u);
         // consoleLog(u.getChildrenAsXML());

src/com/vaadin/terminal/gwt/client/VUIDLBrowser.java

@@ -18,13 +18,14 @@ public class VUIDLBrowser extends Tree {
      * 
      */
     private final UIDL uidl;
+    private ApplicationConfiguration conf;
 
-    public VUIDLBrowser(final UIDL uidl) {
-
+    public VUIDLBrowser(final UIDL uidl, ApplicationConfiguration conf) {
+        this.conf = conf;
         this.uidl = uidl;
         DOM.setStyleAttribute(getElement(), "position", "");
 
-        final UIDLItem root = new UIDLItem(this.uidl);
+        final UIDLItem root = new UIDLItem(this.uidl, conf);
         addItem(root);
         addOpenHandler(new OpenHandler<TreeItem>() {
             public void onOpen(OpenEvent<TreeItem> event) {
@@ -46,10 +47,19 @@ public class VUIDLBrowser extends Tree {
 
         private UIDL uidl;
 
-        UIDLItem(UIDL uidl) {
+        UIDLItem(UIDL uidl, ApplicationConfiguration conf) {
             this.uidl = uidl;
             try {
-                setText(uidl.getTag());
+                String name = uidl.getTag();
+                try {
+                    Integer.parseInt(name);
+                    Class<? extends Paintable> widgetClassByDecodedTag = conf
+                            .getWidgetClassByEncodedTag(name);
+                    name = widgetClassByDecodedTag.getName();
+                } catch (Exception e) {
+                    // NOP
+                }
+                setText(name);
                 addItem("LOADING");
             } catch (Exception e) {
                 setText(uidl.toString());
@@ -61,6 +71,15 @@ public class VUIDLBrowser extends Tree {
             removeItem(temp);
 
             String nodeName = uidl.getTag();
+            try {
+                Integer.parseInt(nodeName);
+                Class<? extends Paintable> widgetClassByDecodedTag = conf
+                        .getWidgetClassByEncodedTag(nodeName);
+                nodeName = widgetClassByDecodedTag.getName();
+            } catch (Exception e) {
+                // NOP
+            }
+
             Set<String> attributeNames = uidl.getAttributeNames();
             for (String name : attributeNames) {
                 if (uidl.isMapAttribute(name)) {
@@ -121,7 +140,7 @@ public class VUIDLBrowser extends Tree {
                 final Object child = i.next();
                 try {
                     final UIDL c = (UIDL) child;
-                    final TreeItem childItem = new UIDLItem(c);
+                    final TreeItem childItem = new UIDLItem(c, conf);
                     addItem(childItem);
 
                 } catch (final Exception e) {

src/com/vaadin/terminal/gwt/client/WidgetMap.java

@@ -0,0 +1,38 @@
+package com.vaadin.terminal.gwt.client;
+
+import com.vaadin.terminal.gwt.client.ui.VDateFieldCalendar;
+import com.vaadin.terminal.gwt.client.ui.VPasswordField;
+import com.vaadin.terminal.gwt.client.ui.VSplitPanelVertical;
+import com.vaadin.terminal.gwt.client.ui.VTextArea;
+import com.vaadin.terminal.gwt.client.ui.VWindow;
+
+public abstract class WidgetMap {
+
+    public Paintable instantiate(Class<? extends Paintable> classType) {
+        /*
+         * Yes, this (including the generated) may look very odd code, but due
+         * the nature of GWT, we cannot do this with reflect. Luckily this is
+         * mostly written by WidgetSetGenerator, here are just some hacks. Extra
+         * instantiation code is needed if client side widget has no "native"
+         * counterpart on client side.
+         */
+        if (VSplitPanelVertical.class == classType) {
+            return new VSplitPanelVertical();
+        } else if (VTextArea.class == classType) {
+            return new VTextArea();
+
+        } else if (VDateFieldCalendar.class == classType) {
+            return new VDateFieldCalendar();
+        } else if (VPasswordField.class == classType) {
+            return new VPasswordField();
+        } else if (VWindow.class == classType) {
+            return new VWindow();
+        } else {
+            return null; // let generated type handle this
+        }
+    }
+
+    public abstract Class<? extends Paintable> getImplementationByServerSideClassName(
+            String fullyqualifiedName);
+
+}

src/com/vaadin/terminal/gwt/client/WidgetSet.java

@@ -15,10 +15,13 @@ public interface WidgetSet extends EntryPoint {
      * 
      * @param uidl
      *            UIDL to be painted with returned component.
+     * @param client
+     *            the application connection that whishes to instantiate widget
+     * 
      * @return New uninitialized and unregistered component that can paint given
      *         UIDL.
      */
-    public Paintable createWidget(UIDL uidl);
+    public Paintable createWidget(UIDL uidl, ApplicationConfiguration conf);
 
     /**
      * Test if the given component implementation conforms to UIDL.
@@ -30,5 +33,18 @@ public interface WidgetSet extends EntryPoint {
      * @return true iff createWidget would return a new component of the same
      *         class than currentWidget
      */
-    public boolean isCorrectImplementation(Widget currentWidget, UIDL uidl);
+    public boolean isCorrectImplementation(Widget currentWidget, UIDL uidl,
+            ApplicationConfiguration conf);
+
+    /**
+     * Due its nature, GWT does not support dynamic classloading. To bypass this
+     * limitation, widgetset must have function that returns Class by its fully
+     * qualified name.
+     * 
+     * @param fullyQualifiedName
+     * @return
+     */
+    public Class<? extends Paintable> getImplementationByClassName(
+            String fullyQualifiedName);
+
 }

src/com/vaadin/terminal/gwt/client/ui/VUnknownComponent.java

@@ -35,7 +35,7 @@ public class VUnknownComponent extends Composite implements Paintable {
             uidlTree.removeFromParent();
         }
 
-        uidlTree = new VUIDLBrowser(uidl);
+        uidlTree = new VUIDLBrowser(uidl, client.getConfiguration());
         panel.add(uidlTree);
     }
 

src/com/vaadin/terminal/gwt/rebind/ClassPathExplorer.java

@@ -0,0 +1,266 @@
+package com.vaadin.terminal.gwt.rebind;
+
+import java.io.File;
+import java.io.FileFilter;
+import java.io.IOException;
+import java.net.JarURLConnection;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.Collection;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+import com.vaadin.terminal.Paintable;
+import com.vaadin.ui.ClientWidget;
+
+/**
+ * Utility class to find server side widgets with {@link ClientWidget}
+ * annotation. Used by WidgetMapGenerator to implement some monkey coding for
+ * you.
+ * <p>
+ * If you end up reading this comment, I guess you have faced a sluggish
+ * performance of widget compilation or unreliable detection of components in
+ * your classpaths. The thing you might be able to do is to use annotation
+ * processing tool like apt to generate the needed information. Then either use
+ * that information in {@link WidgetMapGenerator} or create the appropriate
+ * monkey code for gwt directly in annotation processor and get rid of
+ * {@link WidgetMapGenerator}. Using annotation processor might be a good idea
+ * when dropping Java 1.5 support (integrated to javac in 6).
+ * 
+ */
+public class ClassPathExplorer {
+    private final static FileFilter DIRECTORIES_ONLY = new FileFilter() {
+        public boolean accept(File f) {
+            if (f.exists() && f.isDirectory()) {
+                return true;
+            } else {
+                return false;
+            }
+        }
+    };
+
+    private static Map<URL, String> classpathLocations = getClasspathLocations();
+
+    private ClassPathExplorer() {
+    }
+
+    public static Collection<Class<? extends Paintable>> getPaintablesHavingWidgetAnnotation() {
+        Collection<Class<? extends Paintable>> paintables = new HashSet<Class<? extends Paintable>>();
+        Set<URL> keySet = classpathLocations.keySet();
+        for (URL url : keySet) {
+            searchForPaintables(url, classpathLocations.get(url), paintables);
+        }
+        return paintables;
+
+    }
+
+    /**
+     * Determine every URL location defined by the current classpath, and it's
+     * associated package name.
+     */
+    public final static Map<URL, String> getClasspathLocations() {
+        Map<URL, String> locations = new HashMap<URL, String>();
+
+        String pathSep = System.getProperty("path.separator");
+        String classpath = System.getProperty("java.class.path");
+
+        String[] split = classpath.split(pathSep);
+        for (int i = 0; i < split.length; i++) {
+            String classpathEntry = split[i];
+            if (acceptClassPathEntry(classpathEntry)) {
+                File file = new File(classpathEntry);
+                include(null, file, locations);
+            }
+        }
+
+        return locations;
+    }
+
+    private static boolean acceptClassPathEntry(String classpathEntry) {
+        if (!classpathEntry.endsWith(".jar")) {
+            // accept all non jars (practically directories)
+            return true;
+        } else {
+            // accepts jars that comply with vaadin-component packaging
+            // convention (.vaadin. or vaadin- as distribution packages),
+            if (classpathEntry.contains("vaadin-")
+                    || classpathEntry.contains(".vaadin.")) {
+                return true;
+            } else {
+                return false;
+            }
+        }
+    }
+
+    /**
+     * Recursively add subdirectories and jar files to classpathlocations
+     * 
+     * @param name
+     * @param file
+     * @param locations
+     */
+    private final static void include(String name, File file,
+            Map<URL, String> locations) {
+        if (!file.exists()) {
+            return;
+        }
+        if (!file.isDirectory()) {
+            // could be a JAR file
+            includeJar(file, locations);
+            return;
+        }
+
+        if (file.isHidden() || file.getPath().contains(File.separator + ".")) {
+            return;
+        }
+
+        if (name == null) {
+            name = "";
+        } else {
+            name += ".";
+        }
+
+        // add all directories recursively
+        File[] dirs = file.listFiles(DIRECTORIES_ONLY);
+        for (int i = 0; i < dirs.length; i++) {
+            try {
+                // add the present directory
+                locations.put(new URL("file://" + dirs[i].getCanonicalPath()),
+                        name + dirs[i].getName());
+            } catch (Exception ioe) {
+                return;
+            }
+            include(name + dirs[i].getName(), dirs[i], locations);
+        }
+    }
+
+    private static void includeJar(File file, Map<URL, String> locations) {
+        try {
+            URL url = new URL("file:" + file.getCanonicalPath());
+            url = new URL("jar:" + url.toExternalForm() + "!/");
+            JarURLConnection conn = (JarURLConnection) url.openConnection();
+            JarFile jarFile = conn.getJarFile();
+            if (jarFile != null) {
+                locations.put(url, "");
+            }
+        } catch (Exception e) {
+            // e.printStackTrace();
+            return;
+        }
+
+    }
+
+    private static String packageNameFor(JarEntry entry) {
+        if (entry == null) {
+            return "";
+        }
+        String s = entry.getName();
+        if (s == null) {
+            return "";
+        }
+        if (s.length() == 0) {
+            return s;
+        }
+        if (s.startsWith("/")) {
+            s = s.substring(1, s.length());
+        }
+        if (s.endsWith("/")) {
+            s = s.substring(0, s.length() - 1);
+        }
+        return s.replace('/', '.');
+    }
+
+    private final static void searchForPaintables(URL location,
+            String packageName,
+            Collection<Class<? extends Paintable>> paintables) {
+
+        // Get a File object for the package
+        File directory = new File(location.getFile());
+
+        if (directory.exists() && !directory.isHidden()) {
+            // Get the list of the files contained in the directory
+            String[] files = directory.list();
+            for (int i = 0; i < files.length; i++) {
+                // we are only interested in .class files
+                if (files[i].endsWith(".class")) {
+                    // remove the .class extension
+                    String classname = files[i].substring(0,
+                            files[i].length() - 6);
+                    classname = packageName + "." + classname;
+                    tryToAdd(classname, paintables);
+                }
+            }
+        } else {
+            try {
+                // check files in jar file, entries will list all directories
+                // and files in jar
+
+                URLConnection openConnection = location.openConnection();
+
+                if (openConnection instanceof JarURLConnection) {
+                    JarURLConnection conn = (JarURLConnection) openConnection;
+
+                    JarFile jarFile = conn.getJarFile();
+
+                    Enumeration<JarEntry> e = jarFile.entries();
+                    while (e.hasMoreElements()) {
+                        JarEntry entry = e.nextElement();
+                        String entryname = entry.getName();
+                        if (!entry.isDirectory()
+                                && entryname.endsWith(".class")
+                                && !entryname.contains("$")) {
+                            String classname = entryname.substring(0, entryname
+                                    .length() - 6);
+                            if (classname.startsWith("/")) {
+                                classname = classname.substring(1);
+                            }
+                            classname = classname.replace('/', '.');
+                            tryToAdd(classname, paintables);
+                        }
+                    }
+                }
+            } catch (IOException e) {
+                System.err.println(e);
+            }
+        }
+
+    }
+
+    private static void tryToAdd(final String fullclassName,
+            Collection<Class<? extends Paintable>> paintables) {
+        try {
+            Class<?> c = Class.forName(fullclassName);
+            if (c.getAnnotation(ClientWidget.class) != null) {
+                paintables.add((Class<? extends Paintable>) c);
+                System.out.println("Found paintable " + fullclassName);
+            }
+        } catch (ExceptionInInitializerError e) {
+            // e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            // e.printStackTrace();
+        } catch (NoClassDefFoundError e) {
+            // NOP
+        } catch (UnsatisfiedLinkError e) {
+            // NOP
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * Test method for helper tool
+     */
+    public static void main(String[] args) {
+        Collection<Class<? extends Paintable>> paintables = ClassPathExplorer
+                .getPaintablesHavingWidgetAnnotation();
+        System.out.println("Found annotated paintables:");
+        for (Class<? extends Paintable> cls : paintables) {
+            System.out.println(cls.getCanonicalName());
+        }
+    }
+}

src/com/vaadin/terminal/gwt/rebind/WidgetMapGenerator.java

@@ -0,0 +1,192 @@
+package com.vaadin.terminal.gwt.rebind;
+
+import java.io.PrintWriter;
+import java.util.Collection;
+import java.util.Date;
+import java.util.Iterator;
+
+import com.google.gwt.core.ext.Generator;
+import com.google.gwt.core.ext.GeneratorContext;
+import com.google.gwt.core.ext.TreeLogger;
+import com.google.gwt.core.ext.UnableToCompleteException;
+import com.google.gwt.core.ext.TreeLogger.Type;
+import com.google.gwt.core.ext.typeinfo.JClassType;
+import com.google.gwt.core.ext.typeinfo.TypeOracle;
+import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
+import com.google.gwt.user.rebind.SourceWriter;
+import com.vaadin.terminal.Paintable;
+import com.vaadin.terminal.gwt.client.ui.VView;
+import com.vaadin.ui.ClientWidget;
+
+/**
+ * GWT generator to build WidgetMapImpl dynamically based on
+ * {@link ClientWidget} annotations available in workspace.
+ * 
+ */
+public class WidgetMapGenerator extends Generator {
+
+    private String packageName;
+    private String className;
+
+    @Override
+    public String generate(TreeLogger logger, GeneratorContext context,
+            String typeName) throws UnableToCompleteException {
+
+        try {
+            TypeOracle typeOracle = context.getTypeOracle();
+
+            // get classType and save instance variables
+            JClassType classType = typeOracle.getType(typeName);
+            packageName = classType.getPackage().getName();
+            className = classType.getSimpleSourceName() + "Impl";
+            // Generate class source code
+            generateClass(logger, context);
+        } catch (Exception e) {
+            logger.log(TreeLogger.ERROR, "WidgetMap creation failed", e);
+        }
+        // return the fully qualifed name of the class generated
+        return packageName + "." + className;
+    }
+
+    /**
+     * Generate source code for WidgetMapImpl
+     * 
+     * @param logger
+     *            Logger object
+     * @param context
+     *            Generator context
+     */
+    private void generateClass(TreeLogger logger, GeneratorContext context) {
+        // get print writer that receives the source code
+        PrintWriter printWriter = null;
+        printWriter = context.tryCreate(logger, packageName, className);
+        // print writer if null, source code has ALREADY been generated, return
+        if (printWriter == null) {
+            return;
+        }
+        logger
+                .log(Type.INFO,
+                        "Detecting vaading components in classpath to generate WidgetMapImpl.java ...");
+        Date date = new Date();
+
+        // init composer, set class properties, create source writer
+        ClassSourceFileComposerFactory composer = null;
+        composer = new ClassSourceFileComposerFactory(packageName, className);
+        composer.setSuperclass("com.vaadin.terminal.gwt.client.WidgetMap");
+        SourceWriter sourceWriter = composer.createSourceWriter(context,
+                printWriter);
+
+        /*
+         * TODO we need som sort of mechanims to exclude/include components from
+         * widgetset. Properties in gwt.xml is one option. Now only possible by
+         * extending this class, overriding getUsedPaintables() method and
+         * redefining deferred binding rule.
+         */
+
+        Collection<Class<? extends Paintable>> paintablesHavingWidgetAnnotation = getUsedPaintables();
+
+        TypeOracle typeOracle = context.getTypeOracle();
+
+        for (Iterator iterator = paintablesHavingWidgetAnnotation.iterator(); iterator
+                .hasNext();) {
+            Class<? extends Paintable> class1 = (Class<? extends Paintable>) iterator
+                    .next();
+
+            ClientWidget annotation = class1.getAnnotation(ClientWidget.class);
+
+            if (typeOracle.findType(annotation.value().getName()) == null) {
+                // GWT widget not inherited
+                logger
+                        .log(
+                                Type.WARN,
+                                "Widget implementation for "
+                                        + class1.getName()
+                                        + " not available for GWT compiler. If this is not "
+                                        + "intentional, check your gwt module definition file.");
+                iterator.remove();
+            }
+
+        }
+
+        // generator constructor source code
+        generateImplementationDetector(sourceWriter,
+                paintablesHavingWidgetAnnotation);
+        generateInstantiatorMethod(sourceWriter,
+                paintablesHavingWidgetAnnotation);
+        // close generated class
+        sourceWriter.outdent();
+        sourceWriter.println("}");
+        // commit generated class
+        context.commit(logger, printWriter);
+        logger.log(Type.INFO, "Done. ("
+                + (new Date().getTime() - date.getTime()) / 1000 + "seconds)");
+
+    }
+
+    protected Collection<Class<? extends Paintable>> getUsedPaintables() {
+        return ClassPathExplorer.getPaintablesHavingWidgetAnnotation();
+    }
+
+    private void generateInstantiatorMethod(
+            SourceWriter sourceWriter,
+            Collection<Class<? extends Paintable>> paintablesHavingWidgetAnnotation) {
+        sourceWriter
+                .println("public Paintable instantiate(Class<? extends Paintable> classType) {");
+        sourceWriter.indent();
+
+        sourceWriter
+                .println("Paintable p = super.instantiate(classType); if(p!= null) return p;");
+
+        for (Class<? extends Paintable> class1 : paintablesHavingWidgetAnnotation) {
+            ClientWidget annotation = class1.getAnnotation(ClientWidget.class);
+            Class<? extends com.vaadin.terminal.gwt.client.Paintable> clientClass = annotation
+                    .value();
+            if (clientClass == VView.class) {
+                // VView's are not instantiated by widgetset
+                continue;
+            }
+            sourceWriter.print("if (");
+            sourceWriter.print(clientClass.getName());
+            sourceWriter.print(".class == classType) return new ");
+            sourceWriter.print(clientClass.getName());
+            sourceWriter.println("();");
+            sourceWriter.print(" else ");
+        }
+        sourceWriter
+                .println("return new com.vaadin.terminal.gwt.client.ui.VUnknownComponent();");
+        sourceWriter.println("}");
+    }
+
+    /**
+     * 
+     * @param sourceWriter
+     *            Source writer to output source code
+     * @param paintablesHavingWidgetAnnotation
+     */
+    private void generateImplementationDetector(
+            SourceWriter sourceWriter,
+            Collection<Class<? extends Paintable>> paintablesHavingWidgetAnnotation) {
+        sourceWriter
+                .println("public Class<? extends Paintable> getImplementationByServerSideClassName(String fullyQualifiedName) {");
+        sourceWriter.indent();
+        sourceWriter
+                .println("fullyQualifiedName = fullyQualifiedName.intern();");
+
+        for (Class<? extends Paintable> class1 : paintablesHavingWidgetAnnotation) {
+            ClientWidget annotation = class1.getAnnotation(ClientWidget.class);
+            Class<? extends com.vaadin.terminal.gwt.client.Paintable> clientClass = annotation
+                    .value();
+            sourceWriter.print("if ( fullyQualifiedName == \"");
+            sourceWriter.print(class1.getName());
+            sourceWriter.print("\") return ");
+            sourceWriter.print(clientClass.getName());
+            sourceWriter.println(".class;");
+            sourceWriter.print(" else ");
+        }
+        sourceWriter
+                .println("return com.vaadin.terminal.gwt.client.ui.VUnknownComponent.class;");
+        sourceWriter.println("}");
+
+    }
+
+}

src/com/vaadin/terminal/gwt/server/CommunicationManager.java

@@ -92,7 +92,7 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
 
     public static final String VAR_ARRAYITEM_SEPARATOR = "\u001c";
 
-    private final HashSet<String> currentlyOpenWindowsInClient = new HashSet<String>();
+    private final HashMap<String, OpenWindowCache> currentlyOpenWindowsInClient = new HashMap<String, OpenWindowCache>();
 
     private static final int MAX_BUFFER_SIZE = 64 * 1024;
 
@@ -302,8 +302,6 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
             paintAfterVariablechanges(request, response, applicationServlet,
                     repaintAll, outWriter, window, analyzeLayouts);
 
-            // Mark this window to be open on client
-            currentlyOpenWindowsInClient.add(window.getName());
             if (closingWindowName != null) {
                 currentlyOpenWindowsInClient.remove(closingWindowName);
                 closingWindowName = null;
@@ -322,7 +320,7 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
 
         // If repaint is requested, clean all ids in this root window
         if (repaintAll) {
-            for (final Iterator it = idPaintableMap.keySet().iterator(); it
+            for (final Iterator<String> it = idPaintableMap.keySet().iterator(); it
                     .hasNext();) {
                 final Component c = (Component) idPaintableMap.get(it.next());
                 if (isChildOf(window, c)) {
@@ -363,6 +361,12 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
 
             JsonPaintTarget paintTarget = new JsonPaintTarget(this, outWriter,
                     !repaintAll);
+            OpenWindowCache windowCache = currentlyOpenWindowsInClient
+                    .get(window.getName());
+            if (windowCache == null) {
+                windowCache = new OpenWindowCache();
+                currentlyOpenWindowsInClient.put(window.getName(), windowCache);
+            }
 
             // Paints components
             if (repaintAll) {
@@ -376,8 +380,8 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
             } else {
                 // remove detached components from paintableIdMap so they
                 // can be GC'ed
-                for (Iterator it = paintableIdMap.keySet().iterator(); it
-                        .hasNext();) {
+                for (Iterator<Paintable> it = paintableIdMap.keySet()
+                        .iterator(); it.hasNext();) {
                     Component p = (Component) it.next();
                     if (p.getApplication() == null) {
                         idPaintableMap.remove(paintableIdMap.get(p));
@@ -548,10 +552,10 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
             }
 
             // TODO We should only precache the layouts that are not
-            // cached already
+            // cached already (plagiate from usedPaintableTypes)
             int resourceIndex = 0;
-            for (final Iterator i = paintTarget.getPreCachedResources()
-                    .iterator(); i.hasNext();) {
+            for (final Iterator i = paintTarget.getUsedResources().iterator(); i
+                    .hasNext();) {
                 final String resource = (String) i.next();
                 InputStream is = null;
                 try {
@@ -598,6 +602,30 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
             }
             outWriter.print("}");
 
+            Collection<Class<? extends Paintable>> usedPaintableTypes = paintTarget
+                    .getUsedPaintableTypes();
+            boolean typeMappingsOpen = false;
+            for (Class<? extends Paintable> class1 : usedPaintableTypes) {
+                if (windowCache.cache(class1)) {
+                    // client does not know the mapping key for this type, send
+                    // mapping to client
+                    if (!typeMappingsOpen) {
+                        typeMappingsOpen = true;
+                        outWriter.print(", \"typeMappings\" : { ");
+                    } else {
+                        outWriter.print(" , ");
+                    }
+                    String canonicalName = class1.getCanonicalName();
+                    outWriter.print("\"");
+                    outWriter.print(canonicalName);
+                    outWriter.print("\" : ");
+                    outWriter.print(getTagForType(class1));
+                }
+            }
+            if (typeMappingsOpen) {
+                outWriter.print(" }");
+            }
+
             printLocaleDeclarations(outWriter);
 
             outWriter.print("}]");
@@ -774,6 +802,7 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
                         paintAfterVariablechanges(request, response,
                                 applicationServlet, true, outWriter, window,
                                 false);
+
                     } catch (ServletException e) {
                         // We will ignore all servlet exceptions
                     }
@@ -1093,9 +1122,9 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
         }
 
         // If the requested window is already open, resolve conflict
-        if (currentlyOpenWindowsInClient.contains(window.getName())) {
+        if (currentlyOpenWindowsInClient.containsKey(window.getName())) {
             String newWindowName = window.getName();
-            while (currentlyOpenWindowsInClient.contains(newWindowName)) {
+            while (currentlyOpenWindowsInClient.containsKey(newWindowName)) {
                 newWindowName = window.getName() + "_"
                         + ((int) (Math.random() * 100000000));
             }
@@ -1210,8 +1239,9 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
         // list. The result is that each component should be painted exactly
         // once and any unmodified components will be painted as "cached=true".
 
-        for (final Iterator i = dirtyPaintabletSet.iterator(); i.hasNext();) {
-            final Paintable p = (Paintable) i.next();
+        for (final Iterator<Paintable> i = dirtyPaintabletSet.iterator(); i
+                .hasNext();) {
+            final Paintable p = i.next();
             if (p instanceof Component) {
                 final Component component = (Component) p;
                 if (component.getApplication() == null) {
@@ -1528,4 +1558,37 @@ public class CommunicationManager implements Paintable.RepaintRequestListener,
             return null;
         }
     }
+
+    private static HashMap<Class<? extends Paintable>, Integer> typeToKey = new HashMap<Class<? extends Paintable>, Integer>();
+    private static int nextTypeKey = 0;
+
+    static String getTagForType(Class<? extends Paintable> class1) {
+        synchronized (typeToKey) {
+            Integer object = typeToKey.get(class1);
+            if (object == null) {
+                object = nextTypeKey++;
+                typeToKey.put(class1, object);
+            }
+            return object.toString();
+        }
+    }
+
+    /**
+     * Helper class for terminal to keep track of data that client is expected
+     * to know.
+     */
+    class OpenWindowCache {
+
+        private Set<Object> res = new HashSet<Object>();
+
+        /**
+         * 
+         * @param paintable
+         * @return true if the given class was added to cache
+         */
+        boolean cache(Object object) {
+            return res.add(object);
+        }
+
+    }
 }

src/com/vaadin/terminal/gwt/server/JsonPaintTarget.java

@@ -9,6 +9,7 @@ import java.io.Serializable;
 import java.util.Collection;
 import java.util.HashSet;
 import java.util.Iterator;
+import java.util.LinkedList;
 import java.util.Map;
 import java.util.Set;
 import java.util.Stack;
@@ -24,6 +25,7 @@ import com.vaadin.terminal.Resource;
 import com.vaadin.terminal.ThemeResource;
 import com.vaadin.terminal.VariableOwner;
 import com.vaadin.ui.Alignment;
+import com.vaadin.ui.ClientWidget;
 import com.vaadin.ui.Component;
 
 /**
@@ -53,7 +55,7 @@ public class JsonPaintTarget implements PaintTarget {
 
     private int changes = 0;
 
-    Set preCachedResources = new HashSet();
+    private Set<Object> usedResources = new HashSet<Object>();
 
     private boolean customLayoutArgumentsOpen = false;
 
@@ -67,6 +69,8 @@ public class JsonPaintTarget implements PaintTarget {
 
     private Collection<Paintable> identifiersCreatedDueRefPaint;
 
+    private Collection<Class<? extends Paintable>> usedPaintableTypes = new LinkedList<Class<? extends Paintable>>();
+
     /**
      * Creates a new XMLPrintWriter, without automatic line flushing.
      * 
@@ -472,7 +476,7 @@ public class JsonPaintTarget implements PaintTarget {
         tag.addAttribute("\"" + name + "\": \"" + escapeJSON(value) + "\"");
 
         if (customLayoutArgumentsOpen && "template".equals(name)) {
-            getPreCachedResources().add("layouts/" + value + ".html");
+            getUsedResources().add("layouts/" + value + ".html");
         }
 
         if (name.equals("locale")) {
@@ -1122,12 +1126,8 @@ public class JsonPaintTarget implements PaintTarget {
         }
     }
 
-    public Set getPreCachedResources() {
-        return preCachedResources;
-    }
-
-    public void setPreCachedResources(Set preCachedResources) {
-        throw new UnsupportedOperationException();
+    public Set<Object> getUsedResources() {
+        return usedResources;
     }
 
     /**
@@ -1146,4 +1146,36 @@ public class JsonPaintTarget implements PaintTarget {
             return true;
         }
     }
+
+    @SuppressWarnings("unchecked")
+    public String getTag(Paintable paintable) {
+        /*
+         * Client widget annotation is searched from component hierarchy to
+         * detect the component that presumably has client side implementation.
+         * The server side name is used in the transportation, but encoded into
+         * integer strings to optimized transferred data.
+         */
+        Class<? extends Paintable> class1 = paintable.getClass();
+        ClientWidget annotation = class1.getAnnotation(ClientWidget.class);
+        while (annotation == null) {
+            Class<?> superclass = class1.getSuperclass();
+            if (superclass != null
+                    && Paintable.class.isAssignableFrom(superclass)) {
+                class1 = (Class<? extends Paintable>) superclass;
+                annotation = class1.getAnnotation(ClientWidget.class);
+            } else {
+                System.out
+                        .append("Warning: no superclass of givent has ClientWidget"
+                                + " annotation. Component will not be mapped correctly on client side.");
+                break;
+            }
+        }
+        usedPaintableTypes.add(class1);
+        return CommunicationManager.getTagForType(class1);
+
+    }
+
+    Collection<Class<? extends Paintable>> getUsedPaintableTypes() {
+        return usedPaintableTypes;
+    }
 }

src/com/vaadin/ui/AbsoluteLayout.java

@@ -20,6 +20,7 @@ import com.vaadin.terminal.gwt.client.ui.VAbsoluteLayout;
  * 
  */
 @SuppressWarnings("serial")
+@ClientWidget(VAbsoluteLayout.class)
 public class AbsoluteLayout extends AbstractLayout {
 
     private Collection<Component> components = new LinkedHashSet<Component>();

src/com/vaadin/ui/AbstractComponent.java

@@ -146,8 +146,16 @@ public abstract class AbstractComponent implements Component, MethodEventSource
      * Gets the UIDL tag corresponding to the component.
      * 
      * @return the component's UIDL tag as <code>String</code>
+     * @deprecated tags are no more required for components. Instead of tags we
+     *             are now using {@link ClientWidget} annotations to map server
+     *             side components to client side counterparts. Generating
+     *             identifier for component type is delegated to terminal.
+     * @see ClientWidget
      */
-    public abstract String getTag();
+    @Deprecated
+    public String getTag() {
+        return "";
+    }
 
     public void setDebugId(String id) {
         testingId = id;
@@ -604,7 +612,8 @@ public abstract class AbstractComponent implements Component, MethodEventSource
      * here, we use the default documentation from implemented interface.
      */
     public final void paint(PaintTarget target) throws PaintException {
-        if (!target.startTag(this, getTag()) || repaintRequestListenersNotified) {
+        final String tag = target.getTag(this);
+        if (!target.startTag(this, tag) || repaintRequestListenersNotified) {
 
             // Paint the contents of the component
 
@@ -659,7 +668,7 @@ public abstract class AbstractComponent implements Component, MethodEventSource
             // Contents have not changed, only cached presentation can be used
             target.addAttribute("cached", true);
         }
-        target.endTag(getTag());
+        target.endTag(tag);
 
         repaintRequestListenersNotified = false;
     }

src/com/vaadin/ui/Accordion.java

@@ -1,6 +1,9 @@
 package com.vaadin.ui;
 
+import com.vaadin.terminal.gwt.client.ui.VAccordion;
+
 @SuppressWarnings("serial")
+@ClientWidget(VAccordion.class)
 public class Accordion extends TabSheet {
 
     @Override

src/com/vaadin/ui/Button.java

@@ -12,6 +12,7 @@ import java.util.Map;
 import com.vaadin.data.Property;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VButton;
 
 /**
  * A generic button component.
@@ -22,6 +23,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VButton.class)
 public class Button extends AbstractField {
 
     /* Private members */

src/com/vaadin/ui/CheckBox.java

@@ -9,6 +9,7 @@ import java.lang.reflect.Method;
 import com.vaadin.data.Property;
 
 @SuppressWarnings("serial")
+@ClientWidget(com.vaadin.terminal.gwt.client.ui.VCheckBox.class)
 public class CheckBox extends Button {
     /**
      * Creates a new switch button.
@@ -47,8 +48,8 @@ public class CheckBox extends Button {
      * listening button clicks. Using this method is discouraged because it
      * cannot be checked during compilation. Use
      * {@link #addListener(Class, Object, Method)} or
-     * {@link #addListener(com.vaadin.ui.Component.Listener)} instead.
-     * The method must have either no parameters, or only one parameter of
+     * {@link #addListener(com.vaadin.ui.Component.Listener)} instead. The
+     * method must have either no parameters, or only one parameter of
      * Button.ClickEvent type.
      * 
      * @param caption

src/com/vaadin/ui/ClientWidget.java

@@ -0,0 +1,21 @@
+/**
+ * 
+ */
+package com.vaadin.ui;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+import com.vaadin.terminal.gwt.client.Paintable;
+
+/**
+ * Annotation defining the default client side counterpart in GWT terminal for
+ * {@link Component}
+ */
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.TYPE)
+public @interface ClientWidget {
+    Class<? extends Paintable> value();
+}

src/com/vaadin/ui/CssLayout.java

@@ -50,6 +50,7 @@ import com.vaadin.terminal.gwt.client.ui.VCssLayout;
  * @since 6.1 brought in from "FastLayouts" incubator project
  * 
  */
+@ClientWidget(VCssLayout.class)
 public class CssLayout extends AbstractLayout {
 
     private static final long serialVersionUID = -6408703812053460073L;

src/com/vaadin/ui/CustomComponent.java

@@ -9,6 +9,7 @@ import java.util.Iterator;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VCustomComponent;
 
 /**
  * Custom component provides simple implementation of Component interface for
@@ -25,6 +26,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VCustomComponent.class)
 public class CustomComponent extends AbstractComponentContainer {
 
     /**

src/com/vaadin/ui/CustomLayout.java

@@ -12,6 +12,7 @@ import java.util.Iterator;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VCustomLayout;
 
 /**
  * <p>
@@ -41,6 +42,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VCustomLayout.class)
 public class CustomLayout extends AbstractLayout {
 
     private static final int BUFFER_SIZE = 10000;

src/com/vaadin/ui/DateField.java

@@ -14,6 +14,7 @@ import java.util.Map;
 import com.vaadin.data.Property;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VPopupCalendar;
 
 /**
  * <p>
@@ -34,6 +35,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VPopupCalendar.class)
 public class DateField extends AbstractField {
 
     /* Private members */

src/com/vaadin/ui/Embedded.java

@@ -10,6 +10,7 @@ import java.util.Iterator;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
+import com.vaadin.terminal.gwt.client.ui.VEmbedded;
 
 /**
  * Component for embedding external objects.
@@ -20,6 +21,7 @@ import com.vaadin.terminal.Resource;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VEmbedded.class)
 public class Embedded extends AbstractComponent {
 
     /**

src/com/vaadin/ui/Form.java

@@ -21,6 +21,7 @@ import com.vaadin.terminal.CompositeErrorMessage;
 import com.vaadin.terminal.ErrorMessage;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VForm;
 
 /**
  * Form component provides easy way of creating and managing sets fields.
@@ -54,6 +55,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VForm.class)
 public class Form extends AbstractField implements Item.Editor, Buffered, Item,
         Validatable {
 

src/com/vaadin/ui/FormLayout.java

@@ -4,6 +4,8 @@
 
 package com.vaadin.ui;
 
+import com.vaadin.terminal.gwt.client.ui.VFormLayout;
+
 /**
  * FormLayout is used by {@link Form} to layout fields. It may also be used
  * separately without {@link Form}.
@@ -20,6 +22,7 @@ package com.vaadin.ui;
  * 
  */
 @SuppressWarnings( { "deprecation", "serial" })
+@ClientWidget(VFormLayout.class)
 public class FormLayout extends OrderedLayout {
 
     public FormLayout() {

src/com/vaadin/ui/GridLayout.java

@@ -14,6 +14,7 @@ import java.util.Map.Entry;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VGridLayout;
 
 /**
  * <p>
@@ -36,6 +37,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VGridLayout.class)
 public class GridLayout extends AbstractLayout implements
         Layout.AlignmentHandler, Layout.SpacingHandler {
 

src/com/vaadin/ui/HorizontalLayout.java

@@ -1,5 +1,7 @@
 package com.vaadin.ui;
 
+import com.vaadin.terminal.gwt.client.ui.VHorizontalLayout;
+
 /**
  * Horizontal layout
  * 
@@ -12,6 +14,7 @@ package com.vaadin.ui;
  * @since 5.3
  */
 @SuppressWarnings("serial")
+@ClientWidget(VHorizontalLayout.class)
 public class HorizontalLayout extends AbstractOrderedLayout {
 
     public HorizontalLayout() {

src/com/vaadin/ui/Label.java

@@ -10,6 +10,7 @@ import com.vaadin.data.Property;
 import com.vaadin.data.util.ObjectProperty;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VLabel;
 
 /**
  * Label component for showing non-editable short texts.
@@ -37,6 +38,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VLabel.class)
 public class Label extends AbstractComponent implements Property,
         Property.Viewer, Property.ValueChangeListener,
         Property.ValueChangeNotifier, Comparable {

src/com/vaadin/ui/Link.java

@@ -7,6 +7,7 @@ package com.vaadin.ui;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
+import com.vaadin.terminal.gwt.client.ui.VLink;
 
 /**
  * Link is used to create external or internal URL links.
@@ -17,6 +18,7 @@ import com.vaadin.terminal.Resource;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VLink.class)
 public class Link extends AbstractComponent {
 
     /* Target window border type constant: No window border */

src/com/vaadin/ui/ListSelect.java

@@ -9,12 +9,14 @@ import java.util.Collection;
 import com.vaadin.data.Container;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VListSelect;
 
 /**
  * This is a simple list select without, for instance, support for new items,
  * lazyloading, and other advanced features.
  */
 @SuppressWarnings("serial")
+@ClientWidget(VListSelect.class)
 public class ListSelect extends AbstractSelect {
 
     private int columns = 0;

src/com/vaadin/ui/MenuBar.java

@@ -10,6 +10,7 @@ import java.util.Stack;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
+import com.vaadin.terminal.gwt.client.ui.VMenuBar;
 
 /**
  * <p>
@@ -19,6 +20,7 @@ import com.vaadin.terminal.Resource;
  * </p>
  */
 @SuppressWarnings("serial")
+@ClientWidget(VMenuBar.class)
 public class MenuBar extends AbstractComponent {
 
     // Items of the top-level menu
@@ -340,10 +342,9 @@ public class MenuBar extends AbstractComponent {
 
     /**
      * This interface contains the layer for menu commands of the
-     * {@link com.vaadin.ui.MenuBar} class. It's method will fire when
-     * the user clicks on the containing
-     * {@link com.vaadin.ui.MenuBar.MenuItem}. The selected item is
-     * given as an argument.
+     * {@link com.vaadin.ui.MenuBar} class. It's method will fire when the user
+     * clicks on the containing {@link com.vaadin.ui.MenuBar.MenuItem}. The
+     * selected item is given as an argument.
      */
     public interface Command extends Serializable {
         public void menuSelected(MenuBar.MenuItem selectedItem);
@@ -498,8 +499,8 @@ public class MenuBar extends AbstractComponent {
          * For the containing item. This will return null if the item is in the
          * top-level menu bar.
          * 
-         * @return The containing {@link com.vaadin.ui.MenuBar.MenuItem}
-         *         , or null if there is none
+         * @return The containing {@link com.vaadin.ui.MenuBar.MenuItem} , or
+         *         null if there is none
          */
         public MenuBar.MenuItem getParent() {
             return itsParent;

src/com/vaadin/ui/NativeSelect.java

@@ -9,6 +9,7 @@ import java.util.Collection;
 import com.vaadin.data.Container;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VNativeSelect;
 
 /**
  * This is a simple drop-down select without, for instance, support for
@@ -17,6 +18,7 @@ import com.vaadin.terminal.PaintTarget;
  * better choice.
  */
 @SuppressWarnings("serial")
+@ClientWidget(VNativeSelect.class)
 public class NativeSelect extends AbstractSelect {
 
     // width in characters, mimics TextField

src/com/vaadin/ui/OptionGroup.java

@@ -9,11 +9,13 @@ import java.util.Collection;
 import com.vaadin.data.Container;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VOptionGroup;
 
 /**
  * Configures select to be used as an option group.
  */
 @SuppressWarnings("serial")
+@ClientWidget(VOptionGroup.class)
 public class OptionGroup extends AbstractSelect {
 
     public OptionGroup() {

src/com/vaadin/ui/OrderedLayout.java

@@ -2,6 +2,7 @@ package com.vaadin.ui;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VOrderedLayout;
 
 /**
  * Ordered layout.
@@ -20,6 +21,7 @@ import com.vaadin.terminal.PaintTarget;
  */
 @SuppressWarnings("serial")
 @Deprecated
+@ClientWidget(VOrderedLayout.class)
 public class OrderedLayout extends AbstractOrderedLayout {
     /* Predefined orientations */
 

src/com/vaadin/ui/Panel.java

@@ -15,6 +15,7 @@ import com.vaadin.terminal.KeyMapper;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Scrollable;
+import com.vaadin.terminal.gwt.client.ui.VPanel;
 
 /**
  * Panel - a simple single component container.
@@ -25,6 +26,7 @@ import com.vaadin.terminal.Scrollable;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VPanel.class)
 public class Panel extends AbstractComponentContainer implements Scrollable,
         ComponentContainer.ComponentAttachListener,
         ComponentContainer.ComponentDetachListener, Action.Container {

src/com/vaadin/ui/PopupView.java

@@ -7,6 +7,7 @@ import java.util.Map;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VPopupView;
 
 /**
  * 
@@ -18,6 +19,7 @@ import com.vaadin.terminal.PaintTarget;
  * @author IT Mill Ltd.
  */
 @SuppressWarnings("serial")
+@ClientWidget(VPopupView.class)
 public class PopupView extends AbstractComponentContainer {
 
     private Content content;

src/com/vaadin/ui/ProgressIndicator.java

@@ -8,6 +8,7 @@ import com.vaadin.data.Property;
 import com.vaadin.data.util.ObjectProperty;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VProgressIndicator;
 
 /**
  * <code>ProgressIndicator</code> is component that shows user state of a
@@ -24,6 +25,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 4
  */
 @SuppressWarnings("serial")
+@ClientWidget(VProgressIndicator.class)
 public class ProgressIndicator extends AbstractField implements Property,
         Property.Viewer, Property.ValueChangeListener {
 

src/com/vaadin/ui/RichTextArea.java

@@ -6,6 +6,7 @@ package com.vaadin.ui;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.richtextarea.VRichTextArea;
 
 /**
  * A simple RichTextArea to edit HTML format text.
@@ -15,6 +16,7 @@ import com.vaadin.terminal.PaintTarget;
  * into length of field.
  */
 @SuppressWarnings("serial")
+@ClientWidget(VRichTextArea.class)
 public class RichTextArea extends TextField {
 
     @Override

src/com/vaadin/ui/Select.java

@@ -16,6 +16,7 @@ import com.vaadin.data.Container;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
+import com.vaadin.terminal.gwt.client.ui.VFilterSelect;
 
 /**
  * <p>
@@ -36,6 +37,7 @@ import com.vaadin.terminal.Resource;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VFilterSelect.class)
 public class Select extends AbstractSelect implements AbstractSelect.Filtering {
 
     /**

src/com/vaadin/ui/SplitPanel.java

@@ -10,6 +10,7 @@ import java.util.Map;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Sizeable;
+import com.vaadin.terminal.gwt.client.ui.VSplitPanelHorizontal;
 
 /**
  * SplitPanel.
@@ -23,6 +24,7 @@ import com.vaadin.terminal.Sizeable;
  * @since 5.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VSplitPanelHorizontal.class)
 public class SplitPanel extends AbstractLayout {
 
     /* Predefined orientations */
@@ -80,11 +82,7 @@ public class SplitPanel extends AbstractLayout {
      */
     @Override
     public String getTag() {
-        if (orientation == ORIENTATION_HORIZONTAL) {
-            return "hsplitpanel";
-        } else {
-            return "vsplitpanel";
-        }
+        return "splitpanel";
     }
 
     /**
@@ -218,6 +216,10 @@ public class SplitPanel extends AbstractLayout {
 
         final String position = pos + UNIT_SYMBOLS[posUnit];
 
+        if (orientation == ORIENTATION_VERTICAL) {
+            target.addAttribute("vertical", true);
+        }
+
         target.addAttribute("position", position);
 
         if (isLocked()) {

src/com/vaadin/ui/TabSheet.java

@@ -17,6 +17,7 @@ import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
 import com.vaadin.terminal.Paintable.RepaintRequestListener;
+import com.vaadin.terminal.gwt.client.ui.VTabsheet;
 
 /**
  * Tabsheet component.
@@ -27,6 +28,7 @@ import com.vaadin.terminal.Paintable.RepaintRequestListener;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VTabsheet.class)
 public class TabSheet extends AbstractComponentContainer implements
         RepaintRequestListener {
 

src/com/vaadin/ui/TextField.java

@@ -10,6 +10,7 @@ import java.util.Map;
 import com.vaadin.data.Property;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VTextField;
 
 /**
  * <p>
@@ -32,6 +33,7 @@ import com.vaadin.terminal.PaintTarget;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VTextField.class)
 public class TextField extends AbstractField {
 
     /* Private members */

src/com/vaadin/ui/Tree.java

@@ -31,6 +31,7 @@ import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.Resource;
 import com.vaadin.terminal.gwt.client.MouseEventDetails;
+import com.vaadin.terminal.gwt.client.ui.VTree;
 
 /**
  * Tree component. A Tree can be used to select an item (or multiple items) from
@@ -42,6 +43,7 @@ import com.vaadin.terminal.gwt.client.MouseEventDetails;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VTree.class)
 public class Tree extends AbstractSelect implements Container.Hierarchical,
         Action.Container, ItemClickSource {
 

src/com/vaadin/ui/TwinColSelect.java

@@ -9,12 +9,14 @@ import java.util.Collection;
 import com.vaadin.data.Container;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VTwinColSelect;
 
 /**
  * Multiselect component with two lists: left side for available items and right
  * side for selected items.
  */
 @SuppressWarnings("serial")
+@ClientWidget(VTwinColSelect.class)
 public class TwinColSelect extends AbstractSelect {
 
     private int columns = 0;

src/com/vaadin/ui/Upload.java

@@ -1,5 +1,5 @@
-/* 
-@ITMillApache2LicenseForJavaFiles@
+/*
+ * @ITMillApache2LicenseForJavaFiles@
  */
 
 package com.vaadin.ui;
@@ -17,6 +17,7 @@ import com.vaadin.Application;
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
 import com.vaadin.terminal.UploadStream;
+import com.vaadin.terminal.gwt.client.ui.VUpload;
 
 /**
  * Component for uploading files from client to server.
@@ -54,6 +55,7 @@ import com.vaadin.terminal.UploadStream;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VUpload.class)
 public class Upload extends AbstractComponent implements Component.Focusable {
 
     private boolean delayedFocus;
@@ -200,12 +202,13 @@ public class Upload extends AbstractComponent implements Component.Focusable {
                 try {
                     // still try to close output stream
                     out.close();
-                } catch (IOException e1) {
-                    // NOP
+                } catch (IOException ignored) {
                 }
                 fireUploadInterrupted(filename, type, totalBytes, e);
                 endUpload();
                 interrupted = false;
+                // throw cause ahead
+                throw new IllegalStateException("Uploading failed", e);
             }
         }
     }

src/com/vaadin/ui/UriFragmentUtility.java

@@ -6,6 +6,7 @@ import java.util.Map;
 
 import com.vaadin.terminal.PaintException;
 import com.vaadin.terminal.PaintTarget;
+import com.vaadin.terminal.gwt.client.ui.VUriFragmentUtility;
 
 /**
  * Experimental web browser dependent component for URI fragment (part after
@@ -16,6 +17,7 @@ import com.vaadin.terminal.PaintTarget;
  * 
  */
 @SuppressWarnings("serial")
+@ClientWidget(VUriFragmentUtility.class)
 public class UriFragmentUtility extends AbstractComponent {
 
     /**

src/com/vaadin/ui/VerticalLayout.java

@@ -1,5 +1,7 @@
 package com.vaadin.ui;
 
+import com.vaadin.terminal.gwt.client.ui.VVerticalLayout;
+
 /**
  * Vertical layout
  * 
@@ -13,6 +15,7 @@ package com.vaadin.ui;
  * @since 5.3
  */
 @SuppressWarnings("serial")
+@ClientWidget(VVerticalLayout.class)
 public class VerticalLayout extends AbstractOrderedLayout {
 
     public VerticalLayout() {

src/com/vaadin/ui/Window.java

@@ -24,6 +24,7 @@ import com.vaadin.terminal.Resource;
 import com.vaadin.terminal.Sizeable;
 import com.vaadin.terminal.Terminal;
 import com.vaadin.terminal.URIHandler;
+import com.vaadin.terminal.gwt.client.ui.VView;
 
 /**
  * Application window component.
@@ -34,6 +35,7 @@ import com.vaadin.terminal.URIHandler;
  * @since 3.0
  */
 @SuppressWarnings("serial")
+@ClientWidget(VView.class)
 public class Window extends Panel implements URIHandler, ParameterHandler {
 
     /**
@@ -535,10 +537,15 @@ public class Window extends Panel implements URIHandler, ParameterHandler {
         // Window closing
         target.addVariable(this, "close", false);
 
-        // Paint subwindows
-        for (final Iterator<Window> i = subwindows.iterator(); i.hasNext();) {
-            final Window w = i.next();
-            w.paint(target);
+        if (getParent() == null) {
+            // Paint subwindows
+            for (final Iterator<Window> i = subwindows.iterator(); i.hasNext();) {
+                final Window w = i.next();
+                w.paint(target);
+            }
+        } else {
+            // mark subwindows
+            target.addAttribute("sub", true);
         }
 
         // Paint notifications