Thread blocked when trying to convert docx to pdf

Aspose.Words Product Family
1

Hello,

I’m using Aspose words to convert docx to PDF. Here the code I’m using :

Document doc = new Document(inputStream);
// Remove paragraphs with @remove-line.
Node[] paragraphs = doc.getChildNodes(NodeType.PARAGRAPH, true).toArray();
for (Node paragraph : paragraphs) {
	if (paragraph.getText().trim().equals(REMOVE_LINE)) {
		paragraph.remove();
	}
}
SaveOptions so = SaveOptions.createSaveOptions(SaveFormat.PDF);
so.setMemoryOptimization(true);
doc.save(pOut, so);

Untill septembre I’m using aspose words 18.2 (4 years, I know!) and everything works fine. Then in september, I update Aspose words 22.7 and since then I regularly have all the threads that use aspose that end up crashing one by one.

The application can convert 5 documents at the same time, so 5 threads. In the following capture we see the number of logs generated for each thread. We realize that they are all blocking one after the other :
threads.png (123.6 KB)

By doing a heap dump, I could see that these 5 threads are all stuck in the exactly same place, in an Aspose class :

AsynchronousRenderingExecutor-1
  at com.aspose.words.zzYA7.zzWCN()Z (:177)
  at com.aspose.words.zzzN.remove()V (:98)
  at com.aspose.words.zzWyv.zzZvN(Lcom/aspose/words/zzMH;Z)V (:222)
  at com.aspose.words.zzWyv.zzGX(Lcom/aspose/words/zzMH;Lcom/aspose/words/zzWyv;)V (:298)
  at com.aspose.words.zzMH.zzYqQ(Lcom/aspose/words/zzWyv;)V (:396)
  at com.aspose.words.zzWyv.zzZvN(Lcom/aspose/words/zzMH;Lcom/aspose/words/zzWyv;)V (:261)
  at com.aspose.words.zzMH.zzXrf(Lcom/aspose/words/zzWyv;)V (:407)
  at com.aspose.words.zzWVg.zzYqQ(Lcom/aspose/words/zz6Y;)Z (:182)
  at com.aspose.words.zzWVg.zzZvN(Lcom/aspose/words/zz6Y;Lcom/aspose/words/zz6Y;Z)Z (:202)
  at com.aspose.words.zzYw3.zzWCS(Lcom/aspose/words/zz6Y;Z)Z (:81)
  at com.aspose.words.zzYw3.zzZvN(Lcom/aspose/words/zzzN;Lcom/aspose/words/zz6Y;Z)Z (:89)
  at com.aspose.words.zzWVg.zzWCS(Lcom/aspose/words/zzzN;Z)Z (:165)
  at com.aspose.words.zzWVg.zzYSQ(Lcom/aspose/words/zzYA7;Z)Z (:93)
  at com.aspose.words.zzWVg.zzWCS(Lcom/aspose/words/zzzN;Z)Z (:160)
  at com.aspose.words.zzWVg.zzYSQ(Lcom/aspose/words/zzYA7;Z)Z (:93)
  at com.aspose.words.zzWVg.zzYSQ(Lcom/aspose/words/zz6Y;Z)Z (:68)
  at com.aspose.words.zzWVg.zzYSQ(Lcom/aspose/words/zzvy;Z)Z (:50)
  at com.aspose.words.zzWSz.zzZvN(Lcom/aspose/words/zzvy;Z)V (Unknown Source)
  at com.aspose.words.zzWbE.zzWj1()Z (:979)
  at com.aspose.words.zzWbE.zzXml()Z (:843)
  at com.aspose.words.zzWbE.zzGX(Lcom/aspose/words/zzvy;IZZ)Z (:116)
  at com.aspose.words.zzWbE.zzZvN(Lcom/aspose/words/zzvy;IZZ)Z (:53)
  at com.aspose.words.zzX9I.zzYVE()Z (:104)
  at com.aspose.words.zzX9I.zzYSQ(Lcom/aspose/words/zzYXm;I)Z (:52)
  at com.aspose.words.zzX9I.zzWCS(Lcom/aspose/words/zzYXm;I)Z (:30)
  at com.aspose.words.zzXtG.zzZvN(Lcom/aspose/words/zzYXm;I)V (:191)
  at com.aspose.words.zzXtG.zzGX(Lcom/aspose/words/zzYXm;)V (:64)
  at com.aspose.words.zzW4k.zzZ9H(Lcom/aspose/words/zzYXm;)Z (:284)
  at com.aspose.words.zzW4k.zzXnx(Lcom/aspose/words/zzYXm;)Z (:232)
  at com.aspose.words.zzW4k.zzYan()V (:95)
  at com.aspose.words.zzW4k.zzXrf(Lcom/aspose/words/zzXca;)V (:53)
  at com.aspose.words.zzW8z.zzWbu(Lcom/aspose/words/zzMH;)V (:35)
  at com.aspose.words.zzX1S.zzXFp(Lcom/aspose/words/zzMH;)Z (:135)
  at com.aspose.words.zzZOV.zzWbu(Lcom/aspose/words/zzMH;)V (:438)
  at com.aspose.words.zzXZF.zz5K()V (:293)
  at com.aspose.words.zzg6.zzWqD()V (:95)
  at com.aspose.words.Document.updatePageLayout()V (:2278)
  at com.aspose.words.zzXEN.zzXVD()V (:43)
  at com.aspose.words.zzXgA.zzya(I)V (:59)
  at com.aspose.words.zzVTI.zzZOb(II)V (:249)
  at com.aspose.words.zzVTI.zzGX(Lcom/aspose/words/zzVTI;)V (:155)
  at com.aspose.words.zzVTI.zzZvN(Lcom/aspose/words/Node;Lcom/aspose/words/zzVTI;)V (:150)
  at com.aspose.words.zzVTI.zzAV(Lcom/aspose/words/Node;)V (:137)
  at com.aspose.words.Document.zzVUC()V (:1969)
  at com.aspose.words.Document.zzGX(Lcom/aspose/words/zzY6m;)Lcom/aspose/words/SaveOutputParameters; (:1941)
  at com.aspose.words.Document.zzZvN(Lcom/aspose/words/internal/zzW7Y;Ljava/lang/String;Lcom/aspose/words/SaveOptions;)Lcom/aspose/words/SaveOutputParameters; (:1035)
  at com.aspose.words.Document.zzZvN(Lcom/aspose/words/internal/zzW7Y;Lcom/aspose/words/SaveOptions;)Lcom/aspose/words/SaveOutputParameters; (:1104)
  at com.aspose.words.Document.save(Ljava/io/OutputStream;Lcom/aspose/words/SaveOptions;)Lcom/aspose/words/SaveOutputParameters; (:1094)

Code of the blocked method in class zzYA7:

    final boolean zzWCN() {
        for(zzzN var1 = (zzzN)this.zzXxe(); var1 != null; var1 = (zzzN)var1.zzR9()) {
            if (!var1.isEmpty()) {
                return false;
            }
        }

        return true;
    }

After restarting the application, I try to reconvert one of the failing document and it works, so it doesn’t seem related to the document to be converted.

  • infinite loop due to external condition?
  • concurrent access?

So, do you have an idea of the problem?

Thank you

Jérôme

2

@kehrmit

Thank you for your message. However, please attach the .docx files for which the error appears, we will analyze the problem and reply to you as soon as possible.

3

Hello,

Before convert docx into pdf, docx is generated by the application with customer data, so i don’t have it.

As I say in my first post, I restarted the build process from the same data and it worked fine. So there must be an external cause. But unfortunately with Aspose’s obfuscated code I can’t see what is being used.

I will looking in the heapdump if I found file stored in the memory!

Thanks

4

@kehrmit,

in this case, we will analyze the behavior of the library with your code on our own documents. In case you find a file in the heapdump, it would be nice if you send it. We will report the results of the analysis in this forum thread shortly.