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https://issues.apache.org/jira/browse/PDFBOX-808?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12905472#action_12905472
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Martin Hilpert commented on PDFBOX-808:
---------------------------------------
When I look at org.apache.fontbox.ttf.TTFDataStream.java:
-------------
public byte[] read( int numberOfBytes ) throws IOException
{
byte[] data = new byte[ numberOfBytes ];
int amountRead = 0;
int totalAmountRead = 0;
while( (amountRead = read( data, totalAmountRead,
numberOfBytes-totalAmountRead ) ) != -1 &&
totalAmountRead < numberOfBytes )
{
totalAmountRead += amountRead; //<<<<<<< HERE !!!!!!!!
//read at most numberOfBytes bytes from the stream.
}
return data;
}
-----------------
The thread dump shows
totalAmountRead += amountRead
as the place where it "hangs". When I look at jVisualVM's monitors, it shows
50% CPU usage (as the VM only has this 1 thread, it means that PDFBox uses 100%
of 1 of the 2 cores). So this seems like an endless loop. Memory consumption
slowly increases just to drop after 7 minutes (probably when the garbage
collector cleans up).
The file "nbrm____.ttf" is only 97 KB of size. Something seems to be broken ...
> PDTrueTypeFont.loadTTF() freezes (at TTFDataStream.java:195)
> ------------------------------------------------------------
>
> Key: PDFBOX-808
> URL: https://issues.apache.org/jira/browse/PDFBOX-808
> Project: PDFBox
> Issue Type: Bug
> Components: FontBox
> Affects Versions: 1.2.1
> Environment: PDFBox 1.2.1, JDK 1.6.0_21, Windows XP 32 Bit.
> Reporter: Martin Hilpert
> Priority: Critical
>
> Sometimes (not always), my app "freezes". When I look into jVisualVM thread
> dump, I see this stack trace:
> java.lang.Thread.State: RUNNABLE
> at org.apache.fontbox.ttf.TTFDataStream.read(TTFDataStream.java:195)
> at
> org.apache.fontbox.ttf.TTFDataStream.readString(TTFDataStream.java:69)
> at
> org.apache.fontbox.ttf.TTFDataStream.readString(TTFDataStream.java:57)
> at
> org.apache.fontbox.ttf.PostScriptTable.initData(PostScriptTable.java:104)
> at org.apache.fontbox.ttf.TTFParser.parseTTF(TTFParser.java:140)
> at org.apache.fontbox.ttf.TTFParser.parseTTF(TTFParser.java:87)
> at
> org.apache.pdfbox.pdmodel.font.PDTrueTypeFont.loadDescriptorDictionary(PDTrueTypeFont.java:206)
> at
> org.apache.pdfbox.pdmodel.font.PDTrueTypeFont.loadTTF(PDTrueTypeFont.java:167)
> at
> org.apache.pdfbox.pdmodel.font.PDTrueTypeFont.loadTTF(PDTrueTypeFont.java:143)
> at
> org.apache.pdfbox.pdmodel.font.PDTrueTypeFont.loadTTF(PDTrueTypeFont.java:130)
> It never returns and blocks the application from continuing. This hapend
> several times now every few hours.
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