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HTML to PDF / DOCX / RTF Java converter library › Forums › PD4ML v3 Archived Forums (Read Only) › HTML/CSS rendering issues › ClassCastException with endless loop in PDF page generation

Viewing 7 posts - 1 through 7 (of 7 total)
  • Author
    Posts
  • vk_iconparc
      September 28, 2016 at 07:56
      #27099

      Hello,
      we have experienced a problem with an endless loop occurring on specific HTML (see below). Eventually the thread dies on memory exhaustion.

      Please find the trigger/symptom description below. We would be grateful for a quick fix as the problem is currently affecting us on our live system.

      Causing versions: from 3.9.9. Version 3.9.8fx5 does not exhibit that behavior yet.

      The triggering HTML is as follows:

      <html lang="de">
<body>
<table>
<tr>
<td>
<span style="display:none;">
<a style="display:block;" >
<span style="float: left;"></span>
</a>
</span>
<span style="display:none;">
</span>
</td>
<td>
</td>
</tr>
</table>
</body>
</html>

      In the endless loop situation, the code position seems to be this one:

      java.util.zip.Deflater.deflateBytes(Native Method)
java.util.zip.Deflater.deflate(Deflater.java:444)
java.util.zip.Deflater.deflate(Deflater.java:385)
org.zefer.pd4ml.pdf.f.o00000(Unknown Source)
org.zefer.pd4ml.pdf.c.õO0000(Unknown Source)
org.zefer.pd4ml.pdf.c.ÓÓ0000(Unknown Source)
org.zefer.pd4ml.pdf.PD4Device.startNewPage(Unknown Source)
org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
org.zefer.pd4ml.PD4ML.render(Unknown Source)
...

      Before the endless loop begins, the following messages come in the console log:

      TableCellElement(td) {display=table-cell}

java.lang.ClassCastException: org.zefer.html.doc.b cannot be cast to org.zefer.html.doc.o
at org.zefer.html.doc.r.ôØ0000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.r.öØ0000(Unknown Source)
at org.zefer.html.doc.o.Ò00000(Unknown Source)
at org.zefer.html.doc.o.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.Document.layout(Unknown Source)
at org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
at org.zefer.pd4ml.PD4ML.render(Unknown Source)
...
TableCellElement(td) {display=table-cell}
ContentElement(pd4content) [ ] {line-height=scale (1.2000000476837158), display=table-cell}

java.lang.ClassCastException: org.zefer.html.doc.b cannot be cast to org.zefer.html.doc.o
at org.zefer.html.doc.r.ôO0000(Unknown Source)
at org.zefer.html.doc.q.o00000(Unknown Source)
at org.zefer.html.doc.q.Öo0000(Unknown Source)
at org.zefer.html.doc.q.float(Unknown Source)
at org.zefer.html.doc.view.d.Ó00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.r.öØ0000(Unknown Source)
at org.zefer.html.doc.o.Ò00000(Unknown Source)
at org.zefer.html.doc.o.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.Document.layout(Unknown Source)
at org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
at org.zefer.pd4ml.PD4ML.render(Unknown Source)
...
TableCellElement(td) {display=table-cell}

java.lang.ClassCastException: org.zefer.html.doc.b cannot be cast to org.zefer.html.doc.o
at org.zefer.html.doc.r.ôØ0000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.r.Object(Unknown Source)
at org.zefer.html.doc.o.Ò00000(Unknown Source)
at org.zefer.html.doc.o.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.Document.layout(Unknown Source)
at org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
at org.zefer.pd4ml.PD4ML.render(Unknown Source)
...
TableCellElement(td) {display=table-cell}
ContentElement(pd4content) [ ] {line-height=scale (1.2000000476837158), display=table-cell}

java.lang.ClassCastException: org.zefer.html.doc.b cannot be cast to org.zefer.html.doc.o
at org.zefer.html.doc.r.ôO0000(Unknown Source)
at org.zefer.html.doc.q.o00000(Unknown Source)
at org.zefer.html.doc.q.Öo0000(Unknown Source)
at org.zefer.html.doc.q.float(Unknown Source)
at org.zefer.html.doc.view.d.Ó00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.r.Object(Unknown Source)
at org.zefer.html.doc.o.Ò00000(Unknown Source)
at org.zefer.html.doc.o.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.Document.layout(Unknown Source)
at org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
at org.zefer.pd4ml.PD4ML.render(Unknown Source)
...
TableCellElement(td) {display=table-cell}

java.lang.ClassCastException: org.zefer.html.doc.b cannot be cast to org.zefer.html.doc.o
at org.zefer.html.doc.r.ôØ0000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.o.Ò00000(Unknown Source)
at org.zefer.html.doc.o.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.Document.layout(Unknown Source)
at org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
at org.zefer.pd4ml.PD4ML.render(Unknown Source)
...
TableCellElement(td) {display=table-cell}
ContentElement(pd4content) [ ] {line-height=scale (1.2000000476837158), display=table-cell}

java.lang.ClassCastException: org.zefer.html.doc.b cannot be cast to org.zefer.html.doc.o
at org.zefer.html.doc.r.ôO0000(Unknown Source)
at org.zefer.html.doc.q.o00000(Unknown Source)
at org.zefer.html.doc.q.Öo0000(Unknown Source)
at org.zefer.html.doc.q.float(Unknown Source)
at org.zefer.html.doc.view.d.Ó00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.r.o00000(Unknown Source)
at org.zefer.html.doc.o.Ò00000(Unknown Source)
at org.zefer.html.doc.o.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.view.d.o00000(Unknown Source)
at org.zefer.html.doc.db.o00000(Unknown Source)
at org.zefer.html.doc.Document.layout(Unknown Source)
at org.zefer.pd4ml.PD4ML.o00000(Unknown Source)
at org.zefer.pd4ml.PD4ML.render(Unknown Source)
...

      Thank you, best regards,
      Viktor

      PD4ML
        September 30, 2016 at 11:38
        #29929

        Reproduced. The issue processing scheduled to the next week.

        vk_iconparc
          October 5, 2016 at 09:17
          #29930

          Cool, thank you!

          PD4ML
            October 5, 2016 at 15:55
            #29931

            Just finished a testing. The issue has been fixed in the DEV build. If everything goes fine with QA, we’ll publish a maintenance version on Friday.

            vk_iconparc
              October 14, 2016 at 10:23
              #29932

              I just noticed that the fx2 version is out, we’ll give it a try.

              vk_iconparc
                November 7, 2016 at 13:45
                #29933

                The original problem seems gone now, but we have notice a very similar one, during the simplification of the HTML for another exception (I’ll post that one separately).
                I have a HTML that causes an endless loop around the following stacktrace:

                java.util.zip.Deflater.deflateBytes(Native Method)
java.util.zip.Deflater.deflate(Deflater.java:444)
java.util.zip.Deflater.deflate(Deflater.java:385)
org.zefer.pd4ml.pdf.f.o00000(Unknown Source)
org.zefer.pd4ml.pdf.c.õO0000(Unknown Source)
org.zefer.pd4ml.pdf.c.ÓÓ0000(Unknown Source)
org.zefer.pd4ml.pdf.PD4Device.startNewPage(Unknown Source)
org.zefer.pd4ml.PD4ML.super(Unknown Source)
org.zefer.pd4ml.PD4ML.render(Unknown Source)

                -> Since the simplification of the HTML is a time consuming task and multiple different exceptions occur at different simplification stages, I would much prefer to send you the HTML in a less stripped-down form without publishing the entire load.
                Is there somewhere I could send you the HTML causing this problem?

                vk_iconparc
                  December 14, 2016 at 08:51
                  #29934

                  The issue is solved with 3100. Thank you!

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