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public class Activator implements BundleActivator
{
	public void start(BundleContext context) throws Exception 
	{	
		ServiceReference ref = context.getServiceReference(PreferencesService.class.getName());
		if (ref != null)
		{
			PreferencesService service = (PreferencesService) context.getService(ref);
	
			//...
		}
	}

	//..

		Preferences systemRoot = service.getSystemPreferences();