guyukou commented on issue #2396: Why JDBC4Connection implements 
EnhancedInstance?
URL: 
https://github.com/apache/incubator-skywalking/issues/2396#issuecomment-475528861
 
 
   
![image](https://user-images.githubusercontent.com/15632270/54808966-c5f15180-4cbc-11e9-8edd-63934ae844ab.png)
   This is a screenshot from my local debug env, and it will cause a 
ClassCastException as beblow.
   
![image](https://user-images.githubusercontent.com/15632270/54809014-f0dba580-4cbc-11e9-956a-d45a0f93b77b.png)
   

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