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https://issues.apache.org/jira/browse/PDFBOX-4219?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16472562#comment-16472562
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John Hewson commented on PDFBOX-4219:
-------------------------------------
Hmm, looks like this is to support nested reading of tables, such as the
HorizontalMetricsTable.read which starts by calling getHorizontalHeader
> Multithreading problem when rendering several documents with Standard 14 fonts
> ------------------------------------------------------------------------------
>
> Key: PDFBOX-4219
> URL: https://issues.apache.org/jira/browse/PDFBOX-4219
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox, Rendering
> Affects Versions: 2.0.9, 3.0.0 PDFBox
> Environment: Windows 7
> jdk1.8.0_172
> Reporter: Tilman Hausherr
> Priority: Major
> Labels: multi-threading, multithreading
> Attachments: 014261-p3-ccitt.pdf, 014261-p3-ccitt.pdf-1-bad1.png,
> 014261-p3-ccitt.pdf-1-bad2.png, 014261-p3-ccitt.pdf-1-bad3.png,
> 014261-p3-ccitt.pdf-1.png, 166292-fi-ligature.pdf,
> 166292-fi-ligature.pdf-1-bad1.png, 166292-fi-ligature.pdf-1-bad2.png,
> 166292-fi-ligature.pdf-1-bad3.png, 166292-fi-ligature.pdf-1.png,
> MulithreadTest.java
>
>
> I get rendering errors and sometimes exceptions in my regression tests. It is
> somehow related to several threads initializing standard 14 fonts. It happens
> only about every 25 times in a test program I created. That one renders 2
> files in 4 threads and compares the result with the existing result.
> My theory is that one thread accesses the naming table and another accesses
> the glyf table, and both change the stream position. I tried several things
> in the last months to avoid it, all were unsuccessful and I lost my notes
> about it last winter due to a static discharge on a usb stick. (Thank you
> KINGSTON!)
> Here's the output when it doesn't go well:
> {noformat}
> 11.05.2018 10:54:26.322 WARN [pool-1-thread-4]
> org.apache.pdfbox.pdmodel.font.PDType1Font:296 - Using fallback font
> TimesNewRomanPS-BoldMT for Galliard-Bold
> 11.05.2018 10:54:26.323 WARN [pool-1-thread-2]
> org.apache.pdfbox.pdmodel.font.PDType1Font:296 - Using fallback font
> TimesNewRomanPS-BoldMT for Galliard-Bold
> 11.05.2018 10:54:26.386 WARN [pool-1-thread-2]
> org.apache.pdfbox.pdmodel.font.PDType1Font:296 - Using fallback font
> TimesNewRomanPSMT for Galliard-Roman
> 11.05.2018 10:54:26.421 WARN [pool-1-thread-4]
> org.apache.pdfbox.pdmodel.font.PDType1Font:296 - Using fallback font
> TimesNewRomanPSMT for Galliard-Roman
> 11.05.2018 10:54:26.697 WARN [pool-1-thread-2]
> org.apache.pdfbox.pdmodel.font.PDType1Font:296 - Using fallback font
> TimesNewRomanPS-ItalicMT for Galliard-Italic
> 11.05.2018 10:54:26.818 WARN [pool-1-thread-4]
> org.apache.pdfbox.pdmodel.font.PDType1Font:296 - Using fallback font
> TimesNewRomanPS-ItalicMT for Galliard-Italic
> C:\Users\XXX\Documents\Java\PDFBox
> reactor\pdfbox\src\test\resources\input\rendering\166292-fi-ligature.pdf
> oh oh
> C:\Users\XXX\Documents\Java\PDFBox
> reactor\pdfbox\src\test\resources\input\rendering\166292-fi-ligature.pdf
> oh oh
> C:\Users\XXX\Documents\Java\PDFBox
> reactor\pdfbox\src\test\resources\input\rendering\014261-p3-ccitt.pdf
> oh oh
> C:\Users\XXX\Documents\Java\PDFBox
> reactor\pdfbox\src\test\resources\input\rendering\014261-p3-ccitt.pdf
> oh oh
> done
> {noformat}
> Sometimes in the past I got exceptions:
> {noformat}
> Exception in thread "Thread-2" java.lang.RuntimeException:
> java.io.IOException: Unexpected end of TTF stream reached
> at pdfboxpageimageextraction.MulithreadTest.run(MulithreadTest.java:87)
> Caused by: java.io.IOException: Unexpected end of TTF stream reached
> at org.apache.fontbox.ttf.TTFDataStream.read(TTFDataStream.java:274)
> at
> org.apache.fontbox.ttf.TTFDataStream.readString(TTFDataStream.java:91)
> at org.apache.fontbox.ttf.NamingTable.read(NamingTable.java:113)
> at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:373)
> at org.apache.fontbox.ttf.TrueTypeFont.getTable(TrueTypeFont.java:163)
> at org.apache.fontbox.ttf.TrueTypeFont.getNaming(TrueTypeFont.java:179)
> at org.apache.fontbox.ttf.TrueTypeFont.getName(TrueTypeFont.java:471)
> at
> org.apache.pdfbox.pdmodel.font.PDType1Font.<init>(PDType1Font.java:296)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:62)
> at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:143)
> at
> org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:60)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:853)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:506)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:478)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:156)
> at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:258)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:225)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:164)
> {noformat}
> Sometimes I get an AIOOBE:
> {noformat}
> Exception in thread "Thread-1" java.lang.ArrayIndexOutOfBoundsException
> at
> org.apache.fontbox.ttf.BufferedRandomAccessFile.read(BufferedRandomAccessFile.java:158)
> at org.apache.fontbox.ttf.RAFDataStream.read(RAFDataStream.java:167)
> at org.apache.fontbox.ttf.TTFDataStream.read(TTFDataStream.java:264)
> at
> org.apache.fontbox.ttf.TTFDataStream.readString(TTFDataStream.java:91)
> at org.apache.fontbox.ttf.NamingTable.read(NamingTable.java:113)
> at org.apache.fontbox.ttf.TrueTypeFont.readTable(TrueTypeFont.java:373)
> at org.apache.fontbox.ttf.TrueTypeFont.getTable(TrueTypeFont.java:163)
> at org.apache.fontbox.ttf.TrueTypeFont.getNaming(TrueTypeFont.java:179)
> at org.apache.fontbox.ttf.TrueTypeFont.getName(TrueTypeFont.java:471)
> at
> org.apache.pdfbox.pdmodel.font.PDType1Font.<init>(PDType1Font.java:296)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:62)
> at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:143)
> at
> org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:60)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:853)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:506)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:478)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:156)
> at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:258)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:225)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:164)
> {noformat}
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