[jira] [Comment Edited] (PDFBOX-2824) ArrayIndexOutOfBoundsException in GlyfSimpleDescript.readFlags() when multithreading

["John Hewson (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/PDFBOX-2824?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14575153#comment-14575153 ] 

John Hewson edited comment on PDFBOX-2824 at 6/5/15 8:05 PM:
-------------------------------------------------------------

FontBox's fonts are some of the few classes in PDFBox which are required to be thread safe. This is because ExternalFonts is static and caches them.

This issue would appear to be a corrupted reader in TrueTypeFont, which is not necessarily due to the method in the stack trace (some other method could be performing unsynchronized access to the same reader). However the culprit will be somewhere in TrueTypeFont or its table reading classes.


was (Author: jahewson):
FontBox's fonts are some of the few classes in PDFBox which are required to be thread safe. This is because ExternalFonts is static and caches them.

This issue would appear to be a corrupted reader in TrueTypeFont, which is not necessarily due to the method in the stack trace (some other method could be performing unsynchronized access to the same reader). However the culprit will be somewhere in TrueTypeFont or it's table reading classes.

> ArrayIndexOutOfBoundsException in GlyfSimpleDescript.readFlags() when multithreading
> ------------------------------------------------------------------------------------
>
>                 Key: PDFBOX-2824
>                 URL: https://issues.apache.org/jira/browse/PDFBOX-2824
>             Project: PDFBox
>          Issue Type: Bug
>          Components: FontBox
>    Affects Versions: 2.0.0
>            Reporter: Tilman Hausherr
>
> From Kenneth K. in the mailing list:
> I have a client application that convert pdf documents into single page tiff images.  Since the user export large quantities of documents I use a multithreaded approach.  Each thread loads it own document and converts the pages one by one.
> The pdf file is serialized to the client thread and then each thread executes the following code.  If I only use 1 thread there is no problem.  I checked to make sure objects are shared between threads.
> {code}
>             docin = PDDocument.load(new ByteArrayInputStream(documentResult.getImage().getContent()),true);
>             if(null==docin)
>               throw new Exception("Invalid PDF document or an occured during retrieval");
>                int numPages = docin.getNumberOfPages();
>                      String strPath = getPath(numPages);
>                      int iPage = 0;
>             PDFRenderer renderer = new PDFRenderer(docin);
>             for (int i=0;i<numPages;i++)
>             {
>               PDPage page = docin.getPage(i);
>               PDRectangle rect = page.getMediaBox();
>               BufferedImage pageImage = null;
>               pageImage = renderer.renderImageWithDPI(i, 200f, ImageType.BINARY);
>               ...
>             }
> {code}
> {code}
> Array index out of range: 8
>        at org.apache.fontbox.ttf.GlyfSimpleDescript.readFlags(GlyfSimpleDescript.java:202)
>        at org.apache.fontbox.ttf.GlyfSimpleDescript.<init>(GlyfSimpleDescript.java:77)
>        at org.apache.fontbox.ttf.GlyphData.initData(GlyphData.java:58)
>        at org.apache.fontbox.ttf.GlyphTable.getGlyph(GlyphTable.java:161)
>        at org.apache.pdfbox.rendering.TTFGlyph2D.getPathForGID(TTFGlyph2D.java:140)
>        at org.apache.pdfbox.rendering.TTFGlyph2D.getPathForCharacterCode(TTFGlyph2D.java:92)
>        at org.apache.pdfbox.rendering.PageDrawer.drawGlyph2D(PageDrawer.java:333)
>        at org.apache.pdfbox.rendering.PageDrawer.showFontGlyph(PageDrawer.java:314)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.showGlyph(PDFStreamEngine.java:731)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.showText(PDFStreamEngine.java:690)
>        at org.apache.pdfbox.rendering.PageDrawer.showText(PageDrawer.java:296)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.showTextStrings(PDFStreamEngine.java:600)
>        at org.apache.pdfbox.contentstream.operator.text.ShowTextAdjusted.process(ShowTextAdjusted.java:38)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:802)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:464)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:438)
>        at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:149)
>        at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:179)
>        at org.apache.pdfbox.rendering.PDFRenderer.renderPage(PDFRenderer.java:205)
>        at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:136)
>        at org.apache.pdfbox.rendering.PDFRenderer.renderImageWithDPI(PDFRenderer.java:95)
>        at org.ilsos.cm.export.client.rmi.workers.Pdf2SinglePageTiff.processResult(Pdf2SinglePageTiff.java:142)
>        at org.ilsos.cm.export.client.rmi.ExportWorker.run(ExportWorker.java:72)
>        at java.lang.Thread.run(Thread.java:784)
> {code}



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