Github user scwf commented on the pull request:
https://github.com/apache/spark/pull/2685#issuecomment-61039848
In assembly jar the class is here
```/org/objenesis/strategy/InstantiatorStrategy.class```
it seems the class name here wrong, should be
```org.objenesis.strategy.InstantiatorStrategy``` but not
```com.esotericsoftware.shaded.```
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