Bug 31556 Export jar from Navigator view fails
(M5 build) In Navigator view (resource perspective), right-click on a src/ directory containing your sources, select export->jar file and the package selector opens with no resource selected (and finish button disabled); but it seems that the src/ dir is really selected, because if you re-select it in the window, it ends up with a "jar creation failed" and a lot of duplicate entries in the error log. If you try the same from the Projects view (Java browsing perspective), it works fine.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarPackageWizardPage.java
private IStructuredSelection fInitialSelection;
	private CheckboxTreeAndListGroup fInputGroup;
	
	private Text	fSourceNameField;	
	private Button	fExportClassFilesCheckbox;
	private Button	fExportJavaFilesCheckbox;	
	
	private Combo	fDestinationNamesCombo;
	private Button	fDestinationBrowseButton;
	
	private Button		fCompressCheckbox;
	private Button		fOverwriteCheckbox;
	private Text		fDescriptionFileText;
	
	private final static String PAGE_NAME= "JarPackageWizardPage"; 
	
	private final static String STORE_EXPORT_CLASS_FILES= PAGE_NAME + ".EXPORT_CLASS_FILES"; 
	private final static String STORE_EXPORT_JAVA_FILES= PAGE_NAME + ".EXPORT_JAVA_FILES"; 
	
	private final static String STORE_DESTINATION_NAMES= PAGE_NAME + ".DESTINATION_NAMES_ID"; 
	
	private final static String STORE_COMPRESS= PAGE_NAME + ".COMPRESS"; 
	private final static String STORE_OVERWRITE= PAGE_NAME + ".OVERWRITE"; 
	
	private final static int SIZING_SELECTION_WIDGET_WIDTH= 480;
	private final static int SIZING_SELECTION_WIDGET_HEIGHT= 150;
	
	/**
	 *	Create an instance of this class
	 */