Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/6735#issuecomment-110725471
The issue is that if a closure is cleaned twice, when cleaning the closure
at the second time, the `$outer` of this closure may have already been set to
`null`. Then when we call `instantiateClass` for this closure,
`enclosingObject` will be null because we cannot find a parent
(https://github.com/zsxwing/spark/blob/SPARK-7527/core/src/main/scala/org/apache/spark/util/ClosureCleaner.scala#L264).
Because the compiler always checks the first parameter in the constructor,
so `NullPointerException` is thrown.
Since the code for `Utils.isInInterpreter == false` is not used and nobody
reports any issue, how about just removing it and always using the code for
`Utils.isInInterpreter == true`?
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