* 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)
```
if (CollectionUtils.isNotEmptyMap(proxiesOftype)) {
            proxiesOftype.remove(key);
            if (proxiesOftype.isEmpty()) {
                proxies.remove(type);
            }
        }
    }
    public void destroy(Class<?> type) {
        Map<String, Object> proxiesOfType = proxies.remove(type);
        proxiesOfType.forEach((k, v) -> {
            ReferenceConfigBase rc = referredReferences.remove(k);
            rc.destroy();
        });
    }
    /**
     * clear and destroy one {@link ReferenceConfigBase} in the cache.
     *
     * @param referenceConfig use for create key.
     */
    public <T> void destroy(ReferenceConfigBase<T> referenceConfig) {
        String key = generator.generateKey(referenceConfig);
        Class<?> type = referenceConfig.getInterfaceClass();
        destroy(key, type);
    }
    /**
     * clear and destroy all {@link ReferenceConfigBase} in the cache.
     */
    public void destroyAll() {
        if (CollectionUtils.isEmptyMap(referredReferences)) {
            return;