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https://issues.apache.org/jira/browse/PDFBOX-5541?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17629884#comment-17629884
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Andreas Lehmkühler commented on PDFBOX-5541:
--------------------------------------------
PDFBox is not thread safe, see [FAQ|https://pdfbox.apache.org/2.0/faq.html] for
further details
> Does pdfbox support multithreading to convert different pages of the same
> document at the same time?
> ----------------------------------------------------------------------------------------------------
>
> Key: PDFBOX-5541
> URL: https://issues.apache.org/jira/browse/PDFBOX-5541
> Project: PDFBox
> Issue Type: Bug
> Reporter: liu
> Priority: Blocker
> Attachments: image-2022-11-07-16-38-15-290.png
>
>
> !image-2022-11-07-16-38-15-290.png!
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2 <init>
> 警告: Could not read embedded OTF for font QCXXKD+SimSun
> java.io.IOException: Unexpectedly no bytes available for read in buffer.
> at
> org.apache.pdfbox.io.ScratchFileBuffer.read(ScratchFileBuffer.java:459)
> at
> org.apache.pdfbox.io.RandomAccessInputStream.read(RandomAccessInputStream.java:98)
> at java.io.InputStream.read(InputStream.java:101)
> at org.apache.pdfbox.filter.FlateFilter.decompress(FlateFilter.java:112)
> at org.apache.pdfbox.filter.FlateFilter.decode(FlateFilter.java:50)
> at org.apache.pdfbox.filter.Filter.decode(Filter.java:87)
> at org.apache.pdfbox.cos.COSInputStream.create(COSInputStream.java:87)
> at org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:175)
> at org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:163)
> at
> org.apache.pdfbox.pdmodel.common.PDStream.createInputStream(PDStream.java:238)
> at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:112)
> at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:65)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createDescendantFont(PDFontFactory.java:139)
> at
> org.apache.pdfbox.pdmodel.font.PDType0Font.<init>(PDType0Font.java:203)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:97)
> at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:146)
> at
> org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:66)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:966)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:541)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:516)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:155)
> at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:284)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:355)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:272)
> at org.apache.pdfbox.Test$2.run(Test.java:175)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2 <init>
> 警告: Could not read embedded OTF for font QCXXKD+SimSun
> java.io.IOException: 'head' table is mandatory
> at org.apache.fontbox.ttf.TTFParser.parseTables(TTFParser.java:198)
> at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:165)
> at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:79)
> at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:27)
> at org.apache.fontbox.ttf.TTFParser.parse(TTFParser.java:110)
> at org.apache.fontbox.ttf.OTFParser.parse(OTFParser.java:73)
> at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:112)
> at
> org.apache.pdfbox.pdmodel.font.PDCIDFontType2.<init>(PDCIDFontType2.java:65)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createDescendantFont(PDFontFactory.java:139)
> at
> org.apache.pdfbox.pdmodel.font.PDType0Font.<init>(PDType0Font.java:203)
> at
> org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:97)
> at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:146)
> at
> org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:66)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:966)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:541)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:516)
> at
> org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:155)
> at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:284)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:355)
> at
> org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:272)
> at org.apache.pdfbox.Test$2.run(Test.java:175)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> at java.lang.Thread.run(Thread.java:748)
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