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https://issues.apache.org/jira/browse/PDFBOX-5362?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler closed PDFBOX-5362.
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> [PATCH] Replace finalize() with Cleaner
> ---------------------------------------
>
> Key: PDFBOX-5362
> URL: https://issues.apache.org/jira/browse/PDFBOX-5362
> Project: PDFBox
> Issue Type: Improvement
> Components: FontBox, IO
> Affects Versions: 3.0.0 PDFBox
> Reporter: Emmeran Seehuber
> Assignee: Andreas Lehmkühler
> Priority: Major
> Attachments: replace_finalizer_with_cleaner_v1.patch
>
>
> Finalizers (method finalize()) are going to be deprecated for removal with
> JDK 18. See [https://openjdk.java.net/jeps/421] for details.
> The best way to replace the finalize() methods is by using the JDK 9
> java.lang.ref.Cleaner. As PDFBox 3 targets JDK 8 this can not be used
> directly.
> The attached patch implements a Cleaner using finalizers for JDK <= 8 and
> using java.lang.ref.Cleaner by reflection for JDK 9+.
> The two remaining finalize() implementing classes are migrated to the new
> Cleaner.
> I’m not really happy with the name and package
> org.apache.fontbox.util.PdfBoxInternalCleaner of the cleaner. Maybe you have
> an idea for a better place and name.
> In theory this patch could be back ported to PDFBox 2, but I’m not sure if
> this is worth the risk.
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