Will GWT Designer work with gwittir widgets?

[mmonette]

I'm attempting to add gwittir bound widgets to a GWT Designer project. When I do, I get the exception below (bottom of message):

Are the gwittir widgets incompatible with GWT Designer, or is this a configuration issue? I'm interested in using gwittir for the databinding/validation facilities. If it's not compatible with Designer, is there a similar framework anyone can recommend?

Thanks
Mike Monette


com.swtdesigner.properties.PropertyException: Designer is unable to create the 'textBox' component at line 21 of GwittirHelloPanel.java, using public com.totsp.gwittir.client.ui.TextBox() and arguments {}.
This can be caused by problems evaluating the arguments of the constructor, or by any other problem that triggers an exception in the component when instantiated.
See your Eclipse <workspace>.metadata\.log file for details.
null
at com.swtdesigner.model.swt.widgets.ConstructorSourcePropertiesHelper.createObject(ConstructorSourcePropertiesHelper.java:274)
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.createWidgetInstance(UIObjectInfo.java:312)
at com.swtdesigner.gwt.model.widgets.panel.CompositeInfo.createWidgetInstance(CompositeInfo.java:42)
at com.swtdesigner.gwt.model.widgets.UIObjectInfo.createWidget(UIObjectInfo.java:264)
at com.swtdesigner.gwt.model.widgets.WidgetInfo.createWidget(WidgetInfo.java:178)
at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.createWidget(AbstractContainerInfo.java:182)
at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.createChildrenWidgets(AbstractContainerInfo.java:202)
at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.createWidget(AbstractContainerInfo.java:183)
at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.createChildrenWidgets(AbstractContainerInfo.java:202)
at com.swtdesigner.gwt.model.widgets.panel.AbstractContainerInfo.createWidget(AbstractContainerInfo.java:183)
at com.swtdesigner.gwt.model.widgets.panel.ThisCompositeInfo.createWidget(ThisCompositeInfo.java:211)
at com.swtdesigner.gwt.model.widgets.panel.ThisCompositeInfo.createGUIComponent(ThisCompositeInfo.java:203)
at com.swtdesigner.model.JavaInfo$18.execute(JavaInfo.java:5610)
at com.swtdesigner.model.swing.properties.custom.DesignTimeHelper.execute(DesignTimeHelper.java:54)
at com.swtdesigner.model.JavaInfo.notifyPropertyChanged(JavaInfo.java:5605)
at com.swtdesigner.model.JavaInfo.notifyPropertyChanged(JavaInfo.java:5586)
at com.swtdesigner.model.JavaInfo.unlockNotify(JavaInfo.java:5557)
at com.swtdesigner.model.JavaInfo.endEdit(JavaInfo.java:771)
at com.swtdesigner.gef.command.common.AddControlCommand.execute(AddControlCommand.java:28)
at org.eclipse.gef.commands.CommandStack.execute(CommandStack.java:78)
at com.swtdesigner.gef.domain.DesignerEditDomain$1.execute(DesignerEditDomain.java:54)
at org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:416)
at org.eclipse.gef.tools.CreationTool.performCreation(CreationTool.java:198)
at org.eclipse.gef.tools.CreationTool.handleButtonUp(CreationTool.java:122)
at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1006)
at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:229)
at com.swtdesigner.gef.domain.DesignerEditDomain.mouseUp(DesignerEditDomain.java:262)
at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:346)
at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:511)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:206)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
Caused by: java.lang.NoClassDefFoundError
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.swtdesigner.model.swt.widgets.ConstructorSourcePropertiesHelper.createObject(ConstructorSourcePropertiesHelper.java:271)
... 53 more

[Eric Clayberg]

I don't know anything about those widgets.

General information about what is required for a custom widget to work with GWT Designer can be found in the GWT Designer FAQ.

The most common problem with custom widgets is the lack of a default (zero-argument) constructor.

[peterblazejewicz]

hi Eric,

maybe issue is that gwittir composites (projects implements gwt composite based composition pattern to add bindings and other things to existing widgets) do not instantiate within constructor but as private field? They basically follow GWTD rules: public default constructor (always present) and parametrized constructors in a way like:

Code: Select all

private Label base = new Label();
/* constructor */
public MyLabel(){
   init();
}
public MyLabel(String text){
   init();
   setText(text0;
}
///
protected void init(){
   // modify base widget with additional init related data
   initWidget(base);
}

http://code.google.com/p/gwittir/source ... client/ui/
because they implement composition using GWT Composite widget there should be no issues I think, however that private field instantiations is something I would check,

regards
Peter

[Eric Clayberg]

GWT Designer won't care about instantiating within a private field like that.

It will care if the component throws an exception during instantiation.