- [ ] I have searched the 
[issues](https://github.com/apache/incubator-dubbo/issues) of this repository 
and believe that this is not a duplicate.
- [ ] 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: 2.6.2
* Operating System version:Red Hat Enterprise Linux Server release 6.6 
(Santiago)
* Java version: 1.8

### Step to reproduce this issue
The execution method is as follows:

1. mvn install all the project.

2. testissue2116\summary-server  run   TestSummaryServer   to start 
summary-server service
![image](https://user-images.githubusercontent.com/39985288/43629693-905c4a8a-9730-11e8-8083-fb58bfa0b08a.png)

3. testissue2116\dubbo-kryo-server run TestServer to start dubbo-kryo-server 
service
![image](https://user-images.githubusercontent.com/39985288/43629706-977e8382-9730-11e8-8b8e-83c02ca7fbb6.png)
![image](https://user-images.githubusercontent.com/39985288/43629712-9d315020-9730-11e8-82e8-8edd6aa2a087.png)
![image](https://user-images.githubusercontent.com/39985288/43629728-a6a7d318-9730-11e8-93ed-dd7c9a973aef.png)

4. testissue2116\dubbo-kryo-client run SimpleClient to call dubbo-kryo-server
![image](https://user-images.githubusercontent.com/39985288/43629750-b3b62794-9730-11e8-9100-6ade581a6237.png)

Pls. provide [GitHub address] to reproduce this issue.
[email protected]:llx206/testKryo.git

### Expected Result

What do you expected from the above steps?

### Actual Result

What is actually happen?
If there is an exception, please attach the exception trace:
![image](https://user-images.githubusercontent.com/39985288/43629675-853f9b52-9730-11e8-9234-35ce9cfed75c.png)

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

```
I found the problem to be the case when serializing using the kryo protocol. 
The above exception occurs when the service is both a provider and a consumer. 
Please help me to see it, thank you very much!

[ Full content available at: 
https://github.com/apache/incubator-dubbo/issues/2179 ]
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