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https://issues.apache.org/jira/browse/TIKA-3298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17284019#comment-17284019
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Tim Allison commented on TIKA-3298:
-----------------------------------

Y, good point.

How do you propose getting the langs as loaded by --list-langs from the 
TesseractOCRParser to a TesseractOCRConfig?

> Add a "preloadLangs" parameter to TesseractOCRParser
> ----------------------------------------------------
>
>                 Key: TIKA-3298
>                 URL: https://issues.apache.org/jira/browse/TIKA-3298
>             Project: Tika
>          Issue Type: Task
>            Reporter: Tim Allison
>            Priority: Minor
>             Fix For: 2.0.0
>
>         Attachments: image-2021-02-10-18-59-47-793.png, 
> image-2021-02-10-19-00-10-691.png, image-2021-02-11-08-56-38-712.png
>
>
> [~peterkronenberg] on the user/dev lists and on TIKA-3297 and TIKA-3296 has 
> observed that the tesseract error message for "lang data doesn't exist" is 
> not extremely clear.  We could add a "preloadLangs" option to 
> TesseractOCRParser (default would be {{false}}).  If set to true, the parser 
> (upon initialization) if it finds tesseract, will call {{tesseract 
> --list-langs}} and then store those langs.  At parse time, if the langs set 
> has anything in it, the TesseractOCRParser will check that set against the 
> user-requested language and throw a clearer exception to the user that the 
> language data doesn't exist for the requested language.



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