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 < n; i++) {
			Object element= fJarPackage.getElements()[i];
			IResource resource= null;
			if (element instanceof IJavaElement) {
				IJavaElement je= (IJavaElement)element;
				try {
					resource= je.getUnderlyingResource();
				} catch (JavaModelException ex) {
					addWarning(JarPackagerMessages.getFormattedString("JarFileExportOperation.underlyingResourceNotFound", je.getElementName()), ex); 
					return count;
				}
			}
			else
				resource= (IResource)element;
			if (resource.getType() == IResource.FILE)
				count++;
			else
				count += getTotalChildCount((IContainer)resource);
		}
		return count;
	}
	
	private int getTotalChildCount(IContainer container) {
		IResource[] members;
		try {
			members= container.members();
		} catch (CoreException ex) {
			return 0;
		}
		int count= 0;