Github user pwendell commented on the pull request:
https://github.com/apache/spark/pull/620#issuecomment-42095686
Would you mind trying an alternative fix?
```
val cls = Class.forName(name, true,
Utils.getContextOrSparkClassLoader)
```
We recently did some clean-up of classloaders and I think we might have
missed this case:
https://github.com/apache/spark/pull/398/files
https://issues.apache.org/jira/browse/SPARK-1480
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