Rodrigo Ferrari created PDFBOX-1389:
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Summary: Multy thread access to pdf generate erros
Key: PDFBOX-1389
URL: https://issues.apache.org/jira/browse/PDFBOX-1389
Project: PDFBox
Issue Type: Bug
Components: Text extraction
Affects Versions: 1.7.1
Environment: Windows/Linux
Reporter: Rodrigo Ferrari
When working with a PDF that need to be accessed by multiple threads and
execute operations to extract the text by region, to avoid the waiting time, it
give me a few of warnings and exceptions.
2012-08-17 11:06:23 WARN org.apache.pdfbox.util.PDFStreamEngine -
java.lang.NullPointerException
java.lang.NullPointerException
at
org.apache.pdfbox.util.operator.SetGraphicsStateParameters.process(SetGraphicsStateParameters.java:50)
at
org.apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:556)
at
org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:270)
at
org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:237)
at
org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:217)
at
org.apache.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:448)
at
org.apache.pdfbox.util.PDFTextStripperByArea.extractRegions(PDFTextStripperByArea.java:153)
at br.com.pol.util.ProcessamentoPagina.run(ProcessamentoPagina.java:58)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown
Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
And the Exception:
2012-08-17 11:06:24 WARN org.apache.pdfbox.pdfparser.BaseParser - Corrupt
object reference
java.lang.RuntimeException: java.io.IOException: Unknown dir object c=')'
cInt=41 peek=')' peekInt=41 16400
at
org.apache.pdfbox.pdfparser.PDFStreamParser$1.tryNext(PDFStreamParser.java:187)
at
org.apache.pdfbox.pdfparser.PDFStreamParser$1.hasNext(PDFStreamParser.java:194)
at
org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:257)
at
org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:237)
at
org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:217)
at
org.apache.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:448)
at
org.apache.pdfbox.util.PDFTextStripperByArea.extractRegions(PDFTextStripperByArea.java:153)
I´m sure it´s the multi thread access, because if I do not use thread, it work
perfectly.
My code:
RandomAccess scratchFile = new RandomAccessFile(new File("tmp_"+source), "rw");
PDDocument document = PDDocument.loadNonSeq(new File(source), scratchFile);
Separate the pages at 5 threads, run each one at the Executor Service.
Thanks in advance.
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