* 启动provider

dubbo-demo-api-provider

* 启动consumer

dubbo-demo-api-consumer

consumer设置generic

```java
    public static void main(String[] args) {
        ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
        reference.setApplication(new ApplicationConfig("dubbo-demo-api-consumer"));
        reference.setRegistry(new RegistryConfig("zookeeper://127.0.0.1:2181"));
        reference.setInterface(DemoService.class);
        reference.setGeneric(true);
        
        Object obj = reference.get();
        for(Class c : obj.getClass().getInterfaces()) {
            System.err.println(c);
        }
        DemoService service = reference.get();
        String message = service.sayHello("dubbo");
        System.out.println(message);
    }
```

客户端会报错：

```
Exception in thread "main" java.lang.ClassCastException: org.apache.dubbo.common.bytecode.proxy0 cannot be cast to org.apache.dubbo.demo.DemoService
	at org.apache.dubbo.demo.consumer.Application.main(Application.java:42)
```
*/
    private transient volatile Invoker<?> invoker;
    /**
     * The flag whether the ReferenceConfig has been initialized
     */
    private transient volatile boolean initialized;
    /**
     * whether this ReferenceConfig has been destroyed
     */
    private transient volatile boolean destroyed;
    private final ServiceRepository repository;
    private DubboBootstrap bootstrap;
    public ReferenceConfig() {
        super();
        this.repository = ApplicationModel.getServiceRepository();
    }
    public ReferenceConfig(Reference reference) {
        super(reference);
        this.repository = ApplicationModel.getServiceRepository();
    }
    public synchronized T get() {
        if (destroyed) {
            throw new IllegalStateException("The invoker of ReferenceConfig(" + url + ") has already destroyed!");
        }
        if (ref == null) {
            init();
        }
        return ref;
    }
    public synchronized void destroy() {