singleton = null;
	public void stop(BundleContext context) throws Exception {		CommonOSGiUtils.getDefault().closeServices();		closeURLTrackerServices();		if (platformURLConverterService != null) {			platformURLConverterService.unregister();			platformURLConverterService = null;		}		if (installLocationTracker != null) {			installLocationTracker.close();			installLocationTracker = null;		}		if (configLocationTracker != null) {			configLocationTracker.close();			configLocationTracker = null;		}		if (bundleTracker != null) {			bundleTracker.close();			bundleTracker = null;		}		if (debugTracker != null) {			debugTracker.close();			debugTracker = null;		}		bundleContext = null;	}