private void init() { Filter virtualConnectorFilter = utilsService.makeFilterForClass(VirtualConnectorProvider.class); virtualConnectorProviderTracker = new ServiceTracker(bundleContext, virtualConnectorFilter, new ServiceTrackerCustomizer() { Filter domainProviderFilter = utilsService.makeFilterForClass(DomainProvider.class); domainProviderTracker = new ServiceTracker(bundleContext, domainProviderFilter, new ServiceTrackerCustomizer() {