- [x] I have searched the 
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository 
and believe that this is not a duplicate.
- [x] I have checked the 
[FAQ](https://github.com/apache/incubator-dubbo/blob/master/FAQ.md) of this 
repository and believe that this is not a duplicate.

### Environment

* Dubbo version: 2.6.4
* Operating System version: Mac OS/X
* Java version: 1.8

### Steps to reproduce this issue

1. checkout dubbo 2.6.2, see as below in the ServiceConfig.java
![51540780365_ 
pic](https://user-images.githubusercontent.com/1165129/47626728-89835480-db67-11e8-9c5d-73c3f3dfe2a1.jpg)
2. checkout dubbo 2.6.4, 
![71540780398_ 
pic](https://user-images.githubusercontent.com/1165129/47626757-a586f600-db67-11e8-959a-2a546453dcb7.jpg)
3. which one is correct for aboves?

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

I think correct result is looks like version 2.6.2

### Actual Result


If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```


[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2698 ]
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