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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