- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.7.4.1
* Java version: 1.8

### Actual Result

[https://github.com/apache/dubbo/blob/839d2a604e629ea9e96b964be09ae221e85312ba/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/ApplicationModel.java#L80](https://github.com/apache/dubbo/blob/839d2a604e629ea9e96b964be09ae221e85312ba/dubbo-common/src/main/java/org/apache/dubbo/rpc/model/ApplicationModel.java#L80)

### Expected Result

```
initFrameworkExts
```
public static final String DEFAULT_PROVIDER_ID = "PROVIDER#DEFAULT";
    public static final String DEFAULT_CONSUMER_ID = "CONSUMER#DEFAULT";
    private static final String NAME = DubboBootstrap.class.getSimpleName();
    private final Logger logger = LoggerFactory.getLogger(getClass());
    private static DubboBootstrap instance;
    private final AtomicBoolean awaited = new AtomicBoolean(false);
    private final Lock lock = new ReentrantLock();
    private final Condition condition = lock.newCondition();
    private final ExecutorService executorService = newSingleThreadExecutor();
    private final EventDispatcher eventDispatcher = EventDispatcher.getDefaultExtension();
    private final ExecutorRepository executorRepository = ExtensionLoader.getExtensionLoader(ExecutorRepository.class).getDefaultExtension();
    private final ConfigManager configManager;
    private final Environment environment;
    private ReferenceConfigCache cache;
    private volatile boolean exportAsync;
    private volatile boolean referAsync;
    private AtomicBoolean initialized = new AtomicBoolean(false);
    private AtomicBoolean started = new AtomicBoolean(false);
    private volatile ServiceInstance serviceInstance;
    private volatile MetadataService metadataService;
    private volatile MetadataServiceExporter metadataServiceExporter;
    private List<ServiceConfigBase<?>> exportedServices = new ArrayList<>();
    private List<Future<?>> asyncExportingFutures = new ArrayList<>();
    private List<CompletableFuture<Object>> asyncReferringFutures = new ArrayList<>();
    /**
     * See {@link ApplicationModel} and {@link ExtensionLoader} for why DubboBootstrap is designed to be singleton.
     */
    public static synchronized DubboBootstrap getInstance() {
        if (instance == null) {
            instance = new DubboBootstrap();