@YoungHu I try to reproduce the problem with the following client code,
```java
ReferenceConfig<DemoService> reference = new ReferenceConfig<>();
reference.setApplication(new ApplicationConfig("first-dubbo-client"));
reference.setRegistry(new RegistryConfig("multicast://224.5.6.7:1234"));
reference.setInterface(DemoService.class);
System.in.read(); // stop provider before continuing
ReferenceConfigCache cache = ReferenceConfigCache.getCache();
try {
DemoService greetingsService = cache.get(reference);
String message = greetingsService.sayHello("dubbo");
System.out.println(message);
} catch (Exception e) {
e.printStackTrace();
}
System.in.read(); // start provide before continuing
DemoService greetingsService = cache.get(reference);
// GreetingsService greetingsService = reference.get();
String message = greetingsService.sayHello("dubbo");
System.out.println(message);
```
With the newest master, it works. That means the second invocation succeed.
Is my client suitable for reproducing the problem ?
[ Full content available at:
https://github.com/apache/incubator-dubbo/pull/2347 ]
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