Bug 14531 Unable to use JarPackager headless
Beginning with the 04/23 Integration build, I am unable to utilize the JarPackager in a headless environment. Specifically, I have defined my own Ant tasks which perform operations including jar packaging. The problem is in JarFileExportOperation.getDirtyEditors(Shell parent). Is it possible to accept null for parent and have the method just return an empty array?
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/jarpackager/JarFileExportOperation.java
for (int i= 0; i < members.length; i++) {
			if (members[i].getType() == IResource.FILE)
				count++;
			else
				count += getTotalChildCount((IContainer)members[i]);
		}
		return count;
	}
	/**
	 * Exports the passed resource to the JAR file
	 *
	 * @param element the resource or JavaElement to export
	 */
	protected void exportElement(Object element, IProgressMonitor progressMonitor) throws InterruptedException {
		int leadSegmentsToRemove= 1;
		IPackageFragmentRoot pkgRoot= null;
		boolean isInJavaProject= false;
		IResource resource= null;
		IJavaProject jProject= null;
		if (element instanceof IJavaElement) {
			isInJavaProject= true;
			IJavaElement je= (IJavaElement)element;
			try {
				resource= je.getUnderlyingResource();
			} catch (JavaModelException ex) {
				addWarning(JarPackagerMessages.getFormattedString("JarFileExportOperation.underlyingResourceNotFound", je.getElementName()), ex); 
				return;
			}
			jProject= je.getJavaProject();
			pkgRoot= JavaModelUtil.getPackageFragmentRoot(je);