* 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)
```
runWithRefer();
        } else {
            runWithBootstrap();
        }
    }
    private static boolean isClassic(String[] args) {
        return args.length > 0 && "classic".equalsIgnoreCase(args[0]);
    }
    private static void runWithBootstrap() {
        ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
        reference.setInterface(DemoService.class);
        DubboBootstrap bootstrap = DubboBootstrap.getInstance();
        bootstrap.application(new ApplicationConfig("dubbo-demo-api-consumer"))
                .registry(new RegistryConfig("zookeeper://127.0.0.1:2181"))
                .reference(reference)
                .start();
        String message = ReferenceConfigCache.getCache().get(reference).sayHello("dubbo");
        System.out.println(message);
    }
    private static void runWithRefer() {
        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);
        DemoService service = reference.get();
        String message = service.sayHello("dubbo");
        System.out.println(message);
    }
}