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https://issues.apache.org/jira/browse/TIKA-3298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17283297#comment-17283297
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Tim Allison commented on TIKA-3298:
-----------------------------------
Weird things happen, but the join() should work in this case.
https://github.com/apache/tika/blob/main/tika-parsers/tika-parsers-classic/tika-parsers-classic-modules/tika-parser-ocr-module/src/test/java/org/apache/tika/parser/ocr/TesseractOCRParserTest.java#L309
There are two options to get langs...just run this code:
{noformat}
TesseractOCRParser p = new TesseractOCRParser();
p.setPreloadLangs(true);
p.initialize(Collections.EMPTY_MAP);
return p.getLangs();
{noformat}
Or try to find the TesseractOCRParser within the
AutoDetectParser/DefaultParser...this option is not as guaranteed...
> 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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