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Interrupt not possible when using ImageAbsorber or TextAbsorber

I am using Aspose PDF 22.1. I spent a lot of time to analyze some buggy behaviour in our application.
One daemon-thread in our application uses page.accept(ImageAbsorber) and also page.accept(TextAbsorber). I do this, to check any PDF before we do an OCR-processing.
When this preCheck-thread needs too much time, I try to interrupt it. It never interrupts, when page.accept-Method is called. The thread remains alive, and never stops. This means, that over a long period of time more and more threads exist, the CPU-usage reaches 100% and the application doesn’t react any more until it crashes. Here is an example of the stack-trace:
“Thread-176” #215 daemon prio=5 os_prio=0 tid=0x0000000064716800 nid=0xd30 runnable [0x000000007efee000]
java.lang.Thread.State: RUNNABLE
at com.aspose.pdf.internal.ms.System.Collections.Generic.lf.lI(Unknown Source)
at com.aspose.pdf.internal.ms.System.Collections.Generic.lf.set_Item(Unknown Source)
at com.aspose.pdf.internal.l2j.lI.lI(Unknown Source)
at com.aspose.pdf.internal.l2v.lh.lI(Unknown Source)
at com.aspose.pdf.internal.l7t.l1j.(Unknown Source)
at com.aspose.pdf.internal.l7h.lf.lI(Unknown Source)
at com.aspose.pdf.internal.l4v.lj.lI(Unknown Source)
at com.aspose.pdf.internal.l4v.lj.lI(Unknown Source)
at com.aspose.pdf.ImagePlacementAbsorber.lf(Unknown Source)
at com.aspose.pdf.ImagePlacementAbsorber.lI(Unknown Source)
at com.aspose.pdf.ImagePlacementAbsorber.visit(Unknown Source)
at com.aspose.pdf.Page.accept(Unknown Source)
at de.lorenz.convert.util.pdf.PDFPreCheckOCR.checkImagesAndText(PDFPreCheckOCR.java:227)
at de.lorenz.convert.util.pdf.PDFPreCheckOCR.checkPage(PDFPreCheckOCR.java:81)
at de.lorenz.convert.util.pdf.PDFPreCheckOCR.preCheckPDF(PDFPreCheckOCR.java:56)
at de.lorenz.convert.util.pdf.ExtendedPreCheckPDF.analyzeWithCancel(ExtendedPreCheckPDF.java:199)
at de.lorenz.convert.util.pdf.ExtendedPreCheckPDF.checkPDF(ExtendedPreCheckPDF.java:75)
at de.lorenz.convert.converter.finals.Converter_Final_OCR_Tess4J.convertFile(Converter_Final_OCR_Tess4J.java:129)
at de.lorenz.convert.application.Thread_CreateOCRPDF.doRun(Thread_CreateOCRPDF.java:47)
at de.lorenz.convert.application.NotifyingThread.run(NotifyingThread.java:94)
at java.lang.Thread.run(Thread.java:748)

The only way, to stop this thread is calling the (deprecated) Thread.stop(). After this, the thread is gone, but as expected some ressources are not freed.

I hope, you can fix this bug soon,
Kind regards, Gerd


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  • Your input PDF.
  • Please create a simple Java application (source code without compilation errors) that helps us to reproduce your problem on our end and attach it here for testing.

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