Emmeran Seehuber created PDFBOX-5362:
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Summary: [PATCH] Replace finalize() with Cleaner
Key: PDFBOX-5362
URL: https://issues.apache.org/jira/browse/PDFBOX-5362
Project: PDFBox
Issue Type: Improvement
Affects Versions: 3.0.0 PDFBox
Reporter: Emmeran Seehuber
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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