private final BundleContext context;
private final ServiceRegistration reg;
public MultiplexingAuthorizableAction(BundleContext context){
this.context = context;
this.tracker = new ServiceTracker(context, createFilter(context),this);
this.tracker.open();
Properties p = new Properties();
p.setProperty("jackrabbit.extension","true");
reg = context.registerService(AuthorizableAction.class.getName(),this,p);