List<UnknownSdkLookup> (@NotNull ProgressIndicator indicator) { List<UnknownSdkLookup> lookups = new ArrayList<>(); UnknownSdkResolver.EP_NAME.forEachExtensionSafe(ext -> { UnknownSdkLookup resolver = ext.createResolver(myProject, indicator); if (resolver != null) { lookups.add(resolver); } }); return lookups; }