getExtensionRegistry().addRegistryChangeListener(this);
extensionRegistry.addRegistryChangeListener(this);
	void start() {		getExtensionRegistry().addRegistryChangeListener(this);		// need to listen for system bundle stopping		context.addBundleListener(this);		// Start the default application		try {			startDefaultApp();		} catch (ApplicationException e) {			FrameworkLog log = Activator.getFrameworkLog();			if (log != null)				log.log(new FrameworkLogEntry(Activator.PI_APP, FrameworkLogEntry.ERROR, 0, Messages.application_errorStartDefault, 0, e, null));		}	}