Bug 110342 SWT Example Launcher: Double-click on "Standalone" folder produces a "Could not instantiate the class to run" log
Build: Eclipse 3.1 I20050627-1435 Platform: Solaris GTK Steps: - Install Eclipse 3.1 with SWT Examples - From Eclipse workbench, go to Window -> Show View -> Other ... - Expand SWT Examples and select SWT Example Launcher. Click OK. - From the SWT Example Launcher view, double-click the "Standalone" folder (under Examples) to open it. The following error log is created: !ENTRY org.eclipse.swt.examples.launcher 4 0 2005-09-22 12:00:56.675 !MESSAGE Could not instantiate the class to run. !STACK 1 org.eclipse.core.runtime.CoreException: Executable extension definition for "mainClass" not found. at org.eclipse.core.internal.registry.ConfigurationElement.throwException (ConfigurationElement.java:192) at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtensio n(ConfigurationElement.java:108) at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableEx tension(ConfigurationElementHandle.java:48) at org.eclipse.swt.examples.launcher.ItemDescriptor.createItemInstance (ItemDescriptor.java:62) at org.eclipse.swt.examples.launcher.LauncherView.launchItem (LauncherView.java:186) at org.eclipse.swt.examples.launcher.LauncherView.access$2 (LauncherView.java:169) at org.eclipse.swt.examples.launcher.LauncherView$1.widgetDefaultSelected (LauncherView.java:69) at org.eclipse.swt.widgets.TypedListener.handleEvent (TypedListener.java:97) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1021) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2867) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2572) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench (Workbench.java:367) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143) at org.eclipse.ui.internal.ide.IDEApplication.run (IDEApplication.java:103) at org.eclipse.core.internal.runtime.PlatformActivator$1.run (PlatformActivator.java:226) at org.eclipse.core.runtime.adaptor.EclipseStarter.run (EclipseStarter.java:376) at org.eclipse.core.runtime.adaptor.EclipseStarter.run (EclipseStarter.java:163) 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.core.launcher.Main.invokeFramework(Main.java:334) at org.eclipse.core.launcher.Main.basicRun(Main.java:278) at org.eclipse.core.launcher.Main.run(Main.java:973) at org.eclipse.core.launcher.Main.main(Main.java:948) !SUBENTRY 1 org.eclipse.core.runtime 4 1 2005-09-22 12:00:56.677 !MESSAGE Executable extension definition for "mainClass" not found.
examples/org.eclipse.swt.examples.launcher/src/org/eclipse/swt/examples/launcher/LauncherView.java
if (pluginViewId != null) {
			final IWorkbenchPart workbenchPart = this;
			final IWorkbenchPartSite workbenchPartSite = workbenchPart.getSite();
			final IWorkbenchPage workbenchPage = workbenchPartSite.getPage();
			try {
				workbenchPage.showView(pluginViewId);
			} catch (PartInitException e) {
				LauncherPlugin.logError(LauncherPlugin.getResourceString("run.error.Invocation"), e);
			}
			return;
		}
		
		if (workbenchShell == null) return;
		try {
			Object instance = itemDescriptor.createItemInstance();
			if (instance != null) {
				Display display = workbenchShell.getDisplay();
				Method openMethod = instance.getClass().getDeclaredMethod("open", new Class[] {Display.class});
				openMethod.invoke(instance, new Object[] {display});
			}
		} catch (NoSuchMethodException e) {
			LauncherPlugin.logError(LauncherPlugin.getResourceString("run.error.DoesNotImplementMethod"), null);
		} catch (Exception e) {
			LauncherPlugin.logError(LauncherPlugin.getResourceString("run.error.CouldNotInstantiateClass"), e);
		}		
	}
	/**
	 * Obtains the selected launch item.
	 * 
	 * @return the currently selected ItemDescriptor