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  1. FutureTask.run() has thrown a NullPointerException
    Java Runtime
    1
    1
    0
  2. ArrayList.addAll() has thrown a NullPointerException
    Java Runtime
    16
    54
    16

Your stack trace compared to the selected pattern

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java.lang.NullPointerException: null
7 matching frames hidden
    at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)

External results for this pattern (2)