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https://issues.apache.org/jira/browse/PDFBOX-6120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18045100#comment-18045100
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Théo Lenoble commented on PDFBOX-6120:
--------------------------------------

Oh my bad, more informations here :

OS : linux

JDK : RedHat OpenJdk 1.8.0_462-b08

{{PreflightDocument}} is closeable but PreflightParser seems to hold some 
ressources, may be some JDK issue as you suggest :)

Didn't heard of VeraPDF, I will check that, thanks for the tips :)

> PreflightParser .validate leads to "Too many open files"
> --------------------------------------------------------
>
>                 Key: PDFBOX-6120
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-6120
>             Project: PDFBox
>          Issue Type: Bug
>          Components: Preflight
>    Affects Versions: 3.0.6 PDFBox
>            Reporter: Théo Lenoble
>            Priority: Major
>
> Hi from France,
> Hope my english will be clear enough to explain what we encounter :D
> We use org.apache.pdfbox:preflight:3.0.6, calling static method 
> PreflightParser.validate we encounter "Too many open files" issues.
> We solved it locally by extending PreflightParser, implementing Closeable 
> interface and overriding validate function.
> Exemple of our solution :
> {code:java}
> public class CustomPreflightParser extends PreflightParser implements 
> Closeable {
>   public static ValidationResult validate(File file) throws IOException {
>     ValidationResult result;
>     try(
>       // we move PreflightParser initialisation here
>       CustomPreflightParser parser = new CustomPreflightParser(file);
>       PreflightDocument document = (PreflightDocument) parser.parse()
>     ) {
>       result = document.validate();
>     }
>     catch (SyntaxValidationException e)
>     {
>       result = e.getResult();
>     }
>     return result;
>   }
>   @Override
>   public void close() {
>     IOUtils.closeQuietly( this.source );
>     IOUtils.closeQuietly( this.document );
>     // May be missing close ressources, seems to be enought for us
>   }
> }
> {code}
> We didn't spend more time on it so may be there is a better solution ?
> We wanted to share it with you in case you validate the issue and provide a 
> proper fix.
> And may be it could help other to avoid having the same issue (or have a 
> quick imperfect solution).
> Hope this could help :)
> Regards,
> Théo Lenoble



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