Github user jdye64 commented on the issue:
https://github.com/apache/nifi/pull/397
@olegz my initial intention was that the "TESS_DATA_PATH" and the
"TessdataDirectoryValidator" being a required PropertyDescriptor would catch
those instances where users tried to use this processor without the native
system dependencies installed. You bring up a good point however since really
all this would do is check that the Tesseract dictionary files are present
which certainly doesn't mean that the native libraries will be there as well.
This doesn't cover the unit test cases however. I like your point about
creating a throw away Tesseract instance to check if the dependencies are
present. I will add something like that.
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