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https://issues.apache.org/jira/browse/PDFBOX-5664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andreas Lehmkühler updated PDFBOX-5664:
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Component/s: Utilities
> 3.0.0: PDFCloneUtility needs a protected constructor to be useable outside of
> PDFBox when using Java 9 JPMS
> -----------------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5664
> URL: https://issues.apache.org/jira/browse/PDFBOX-5664
> Project: PDFBox
> Issue Type: Improvement
> Components: Utilities
> Affects Versions: 3.0.0 PDFBox
> Reporter: Emmeran Seehuber
> Assignee: Andreas Lehmkühler
> Priority: Major
> Fix For: 3.0.1 PDFBox, 4.0.0
>
>
> The constructor of PDFCloneUtility is package private. I did not have a
> problem with this, because I did an ugly workaround in my pdfbox-graphics2d
> 3.0.0 branch. I created a derived class InternalDeprecatedCOSCloner in the
> org.apache.pdfbox.multipdf package inside my project. And could access the
> constructor.
> This works fine as long as you don't plan to use the JPMS modules introduced
> with Java 9. Which I personally don't plan every to do.
> But it seems Apache POI is going to use those JPMS modules, at least
> [~fanningpj] is trying to get POI working with PDFBox 3.0.0 and my
> pdfbox-graphics2d with version 3.0.0. And now he gets a not so nice
>
> {{/Users/pj.fanning/svn/poi/poi-ooxml/src/main/java9/module-info.java:18:
> error: module org.apache.poi.ooxml reads package org.apache.pdfbox.multipdf
> from both de.rototor.pdfbox.graphics2d and org.apache.pdfbox}}
> As the - to be honest rather dirty - workaround done be me no longer works
> with JPMS...
> You can find the concrete usage for the cloner here
> [https://github.com/rototor/pdfbox-graphics2d/blob/master/graphics2d/src/main/java/de/rototor/pdfbox/graphics2d/PdfBoxGraphics2DPaintApplier.java].
> Just search for PDFCloneUtility. I use it to clone PDShading when I'm
> "rewriting" PDFs. I.e. I use PDFBox to draw on my Graphics2D adapter to
> create new PDFs and filter / change stuff in the PDF on the fly. Mostly to
> split PDFs for Seperation colors and such stuff.
> Just making the PDFClonerUtility constructor public again would of course
> work. But I'm not sure that this is the right solution. AFAIR it was made
> package private because of many problems of users which did not really
> understand what this class was for.
> Maybe a solution could be to make the constructor protected and create a
> package private getCloner() factory method? That would allow me to derive
> from the class from outside the original package but would also prevent
> people who don't know for sure that they really want to use this class from
> using it.
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