Github user olegz commented on the issue:
https://github.com/apache/nifi/pull/397
The DLLs are distributed with the Tesseract JAR, but not _.so_ or other OS
specific libs. Basically the current JAR only supports Windows out-of-the-box.
@joewitt If I understand correctly we need to create a custom validator
with something like this inside it
```
new Tesseract();
```
. . . basically a throw-away instance of Tesseract just to see if it loads
successfully as that is where JNA mapping happens
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