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https://issues.apache.org/jira/browse/TIKA-2439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16110733#comment-16110733
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Karl Richter commented on TIKA-2439:
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There's even a comment `// TODO throw exception if models haven't been loaded,
or auto-load all?`... https://github.com/apache/tika/pull/199
> Avoid NullPointerException in
> org.apache.tika.langdetect.OptimaizeLangDetector if models haven't been loaded
> ------------------------------------------------------------------------------------------------------------
>
> Key: TIKA-2439
> URL: https://issues.apache.org/jira/browse/TIKA-2439
> Project: Tika
> Issue Type: Improvement
> Components: languageidentifier
> Affects Versions: 1.17
> Reporter: Karl Richter
>
> In an intuitive usage of
> {code:java}
> LanguageDetector languageDetector =
> LanguageDetector.getDefaultLanguageDetector();
> List<LanguageResult> languageResults =
> languageDetector.detectAll(someNonEmptyString);
> {code}
> `org.apache.tika.langdetect.OptimaizeLangDetector` might/will (?) be chosen
> as default detector, but since there's no call to
> `LanguageDetector.loadModels()` `LanguageDetector.detector` is `null` in
> `detectAll` which causes an unhelpful error situation which one has to
> investigate in the code. A simple check whether `detector` is `null` and
> throwing an `IllegalStateException("models haven't been loaded yet (forgot to
> call loadModels?")` would be much more intuitive.
> If that corresponds to the expected behaviour (it's my first week with Tika),
> I can provide a patch or pull request.
> experienced with 1.16-75-g4455a6f08
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