Bug 118423 [build path] Exception thrown in New Java Project Wizard
Create a new Java Project. On the first page of the wizard select Create Project from existing source. Specify an existing project. Click Next. Note that there are lots of file in the package explorer widget. Click the back button. Note in the Error Log that there are Internal Errors listed. This is important to us because we are using the JavaCapabilityConfigurationPage in our own wizards but are adding content to the project. This error is therefore always exposed to our users. Java Model Exception: Java Model Status [z does not exist] at org.eclipse.jdt.internal.core.JavaElement.newNotPresentException(JavaElement.java:468) at org.eclipse.jdt.internal.core.JavaModelManager.getPerProjectInfoCheckExistence(JavaModelManager.java:1223) at org.eclipse.jdt.internal.core.JavaProject.getPerProjectInfo(JavaProject.java:1785) at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1923) at org.eclipse.jdt.internal.core.PackageFragmentRoot.getRawClasspathEntry(PackageFragmentRoot.java:592) at org.eclipse.jdt.internal.corext.buildpath.ClasspathModifier.isExcluded(ClasspathModifier.java:996) at org.eclipse.jdt.internal.ui.wizards.buildpaths.newsourcepage.DialogPackageExplorer$PackageLabelProvider.getText(DialogPackageExplorer.java:176) at org.eclipse.jface.viewers.DecoratingLabelProvider.getText(DecoratingLabelProvider.java:118) at org.eclipse.jface.viewers.DecoratingLabelProvider.updateLabel(DecoratingLabelProvider.java:208) at org.eclipse.jface.viewers.StructuredViewer.buildLabel(StructuredViewer.java:1855) at org.eclipse.jface.viewers.TreeViewer.doUpdateItem(TreeViewer.java:228) at org.eclipse.jface.viewers.AbstractTreeViewer$UpdateItemSafeRunnable.run(AbstractTreeViewer.java:85) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044) at org.eclipse.core.runtime.Platform.run(Platform.java:783) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:148) at org.eclipse.jface.viewers.AbstractTreeViewer.doUpdateItem(AbstractTreeViewer.java:621) at org.eclipse.jface.viewers.StructuredViewer$UpdateItemSafeRunnable.run(StructuredViewer.java:434) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044) at org.eclipse.core.runtime.Platform.run(Platform.java:783) at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:44) at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:148) at org.eclipse.jface.viewers.StructuredViewer.updateItem(StructuredViewer.java:1763) at org.eclipse.jface.viewers.StructuredViewer.internalUpdate(StructuredViewer.java:1746) at org.eclipse.jface.viewers.StructuredViewer.update(StructuredViewer.java:1697) at org.eclipse.jface.viewers.StructuredViewer.update(StructuredViewer.java:1651) at org.eclipse.jface.viewers.StructuredViewer.handleLabelProviderChanged(StructuredViewer.java:1007) at org.eclipse.jface.viewers.ContentViewer$1.labelProviderChanged(ContentViewer.java:74) at org.eclipse.ui.internal.decorators.DecoratorManager$1.run(DecoratorManager.java:235) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044) at org.eclipse.core.runtime.Platform.run(Platform.java:783) at org.eclipse.ui.internal.decorators.DecoratorManager.fireListener(DecoratorManager.java:233) at org.eclipse.ui.internal.decorators.DecorationScheduler$3.runInUIThread(DecorationScheduler.java:475) at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:93) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:123) at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3057) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2716) at org.eclipse.jface.window.Window.runEventLoop(Window.java:809) at org.eclipse.jface.window.Window.open(Window.java:787) at org.eclipse.ui.actions.NewProjectAction.run(NewProjectAction.java:114) at org.eclipse.jface.action.Action.runWithEvent(Action.java:996) at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:538) at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:488) at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:400) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713) 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(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:324) 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)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/newsourcepage/DialogPackageExplorer.java
return;
        JavaPlugin.createStandardGroups(manager);
        fActionGroup.fillContextMenu(manager);
    }
    
    /**
     * Set the content and label provider of the
     * <code>fPackageViewer</code>
     */
    public void setContentProvider() {
		PackageContentProvider contentProvider= new PackageContentProvider();
		PackageLabelProvider labelProvider= new PackageLabelProvider(AppearanceAwareLabelProvider.DEFAULT_TEXTFLAGS | JavaElementLabels.P_COMPRESSED,
				AppearanceAwareLabelProvider.DEFAULT_IMAGEFLAGS | JavaElementImageProvider.SMALL_ICONS);
		fPackageViewer.setContentProvider(contentProvider);
		fPackageViewer.setLabelProvider(new DecoratingJavaLabelProvider(labelProvider, false));
    }
    
    /**
     * Set the input for the package explorer.
     * 
     * @param project the project to be displayed
     */
    public void setInput(IJavaProject project) {
        fCurrJProject= project;
        fPackageViewer.setInput(new Object());
        IStructuredSelection selection= new StructuredSelection(project);
        fPackageViewer.setSelection(selection);
        fPackageViewer.expandToLevel(2);
        fCurrentSelection= selection;
        try {