Github user apiri commented on the pull request:
https://github.com/apache/nifi/pull/324#issuecomment-211491167
Actually ran into this error myself on both Travis and the efforts of
https://issues.apache.org/jira/browse/NIFI-1654 for Appveyor. I found that
using JUnit temp directories as per a4ef5a1badf0ae475acb1ba73867702aa5f89c80
seemed to remedy this, but then ran into other, similar problems later on. Not
sure exactly what the trigger is, but it seems to be fairly consistent across
Windows.
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