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https://issues.apache.org/jira/browse/PDFBOX-5427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17531082#comment-17531082
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Moritz Flöter commented on PDFBOX-5427:
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done - the 3.0 version is not affected, only <2.0.26
> PDFDebugger does not remove listeners for PagePane when opening new File
> ------------------------------------------------------------------------
>
> Key: PDFBOX-5427
> URL: https://issues.apache.org/jira/browse/PDFBOX-5427
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 2.0.26
> Reporter: Moritz Flöter
> Priority: Minor
>
> A PagePane reacts to changes made to the "Repair AcroForm" setting.
> However this only works without errors for the first document opened in an
> instance of the PDFDebugger.
> For any further document opened, an error is produced when changing the
> setting while the second document is opened. The listeners probably need to
> be removed when loading a new document (or when closing switching/away from
> the PagePane).
> {code:java}
> java.lang.RuntimeException: java.util.concurrent.ExecutionException:
> java.io.IOException: COSStream has been closed and cannot be read. Perhaps
> its enclosing PDDocument has been closed?
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.done(PagePane.java:485)
>
> java.desktop/sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112)
> java.base/java.security.AccessController.doPrivileged(Native Method)
>
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
> Caused by: java.util.concurrent.ExecutionException: java.io.IOException:
> COSStream has been closed and cannot be read. Perhaps its enclosing
> PDDocument has been closed?
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.done(PagePane.java:465)
>
> java.desktop/sun.swing.AccumulativeRunnable.run(AccumulativeRunnable.java:112)
> java.base/java.security.AccessController.doPrivileged(Native Method)
>
> java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)
> Caused by: java.io.IOException: COSStream has been closed and cannot be read.
> Perhaps its enclosing PDDocument has been closed?
> org.apache.pdfbox.cos.COSStream.checkClosed(COSStream.java:83)
> org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:168)
> org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:163)
> org.apache.pdfbox.pdmodel.PDPage.getContents(PDPage.java:157)
>
> org.apache.pdfbox.pdfparser.PDFStreamParser.<init>(PDFStreamParser.java:91)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:535)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:516)
>
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:155)
> org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:279)
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:355)
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.doInBackground(PagePane.java:453)
>
> org.apache.pdfbox.debugger.pagepane.PagePane$RenderWorker.doInBackground(PagePane.java:435)
> java.base/java.lang.Thread.run(Thread.java:829) {code}
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