Bug 123233 [build path] link source wizard creates invalid folder
20060110 - Open build paty > link source - enter a source folder name but leave the location empty - folder is created - Open the properties on the new folder -> NPE java.lang.NullPointerException at org.eclipse.core.internal.filesystem.InternalFileSystemCore.getFileSystem(InternalFileSystemCore.java:62) at org.eclipse.core.filesystem.EFS.getFileSystem(EFS.java:248) at org.eclipse.ui.internal.ide.dialogs.ResourceInfoPage.createStateGroup(ResourceInfoPage.java:428) at org.eclipse.ui.internal.ide.dialogs.ResourceInfoPage.createContents(ResourceInfoPage.java:251) at org.eclipse.jface.preference.PreferencePage.createControl(PreferencePage.java:232) at org.eclipse.jface.preference.PreferenceDialog.createPageControl(PreferenceDialog.java:1371) at org.eclipse.jface.preference.PreferenceDialog$12.run(PreferenceDialog.java:1138) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:785) 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.preference.PreferenceDialog.showPage(PreferenceDialog.java:1132) at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.showPage(FilteredPreferenceDialog.java:350) at org.eclipse.jface.preference.PreferenceDialog$8.selectionChanged(PreferenceDialog.java:638) at org.eclipse.jface.viewers.StructuredViewer$3.run(StructuredViewer.java:802) at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37) at org.eclipse.core.runtime.Platform.run(Platform.java:785) 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.firePostSelectionChanged(StructuredViewer.java:800) at org.eclipse.jface.viewers.StructuredViewer.setSelection(StructuredViewer.java:1511) at org.eclipse.jface.preference.PreferenceDialog.selectSavedItem(PreferenceDialog.java:925) at org.eclipse.ui.internal.dialogs.FilteredPreferenceDialog.selectSavedItem(FilteredPreferenceDialog.java:393)
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/wizards/buildpaths/AddSourceFolderWizardPage.java
fLinkLocation.doFillIntoGrid(parent, numColumns);
			
			LayoutUtil.setHorizontalSpan(fLinkLocation.getLabelControl(null), numColumns);
			LayoutUtil.setHorizontalGrabbing(fLinkLocation.getTextControl(null));
			
			fVariables.doFillIntoGrid(parent, 1);
		}
		
		public IPath getLinkTarget() {
			return Path.fromOSString(fLinkLocation.getText());
		}
		
		public void setLinkTarget(IPath path) {
			fLinkLocation.setText(path.toOSString());
		}
		
		/*(non-Javadoc)
		 * @see org.eclipse.jdt.internal.ui.wizards.dialogfields.IStringButtonAdapter#changeControlPressed(org.eclipse.jdt.internal.ui.wizards.dialogfields.DialogField)
		 */
		public void changeControlPressed(DialogField field) {
			final DirectoryDialog dialog= new DirectoryDialog(getShell());
			dialog.setMessage(NewWizardMessages.JavaProjectWizardFirstPage_directory_message); 
			String directoryName = fLinkLocation.getText().trim();
			if (directoryName.length() == 0) {
				String prevLocation= JavaPlugin.getDefault().getDialogSettings().get(DIALOGSTORE_LAST_EXTERNAL_LOC);
				if (prevLocation != null) {
					directoryName= prevLocation;
				}
			}