* 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)
```
ReferenceConfigBase.appendRuntimeParameters(map);
        if (!ProtocolUtils.isGeneric(generic)) {
            String revision = Version.getVersion(interfaceClass, version);
            if (revision != null && revision.length() > 0) {
                map.put(REVISION_KEY, revision);
            }
            String[] methods = Wrapper.getWrapper(interfaceClass).getMethodNames();
            if (methods.length == 0) {
                logger.warn("No method found in service interface " + interfaceClass.getName());
                map.put(METHODS_KEY, ANY_VALUE);
            } else {
                map.put(METHODS_KEY, StringUtils.join(new HashSet<String>(Arrays.asList(methods)), COMMA_SEPARATOR));
            }
        }
        map.put(INTERFACE_KEY, interfaceName);
        AbstractConfig.appendParameters(map, getMetrics());
        AbstractConfig.appendParameters(map, getApplication());
        AbstractConfig.appendParameters(map, getModule());
        // 
        // 
        AbstractConfig.appendParameters(map, consumer);
        AbstractConfig.appendParameters(map, this);
        Map<String, AsyncMethodInfo> attributes = null;
        if (CollectionUtils.isNotEmpty(getMethods())) {
            attributes = new HashMap<>();
            for (MethodConfig methodConfig : getMethods()) {
                AbstractConfig.appendParameters(map, methodConfig, methodConfig.getName());
                String retryKey = methodConfig.getName() + ".retry";
                if (map.containsKey(retryKey)) {
                    String retryValue = map.remove(retryKey);