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https://issues.apache.org/jira/browse/PDFBOX-2101?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14013797#comment-14013797
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Andreas Lehmkühler commented on PDFBOX-2101:
--------------------------------------------
I've added a clear() method to PDFont and PDXObject to delete cached resources
if necessary in revisions 1598627 (trunk) and 1598633 (1.8 branch). Those
methods are called when clearing PDResources.
PDFont.clear is still empty but I'm going to fill in some stuff soon.
> Surprising memory consumption when extracting images
> ----------------------------------------------------
>
> Key: PDFBOX-2101
> URL: https://issues.apache.org/jira/browse/PDFBOX-2101
> Project: PDFBox
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 1.8.5
> Environment: Windows 7
> java version "1.7.0_55"
> Java(TM) SE Runtime Environment (build 1.7.0_55-b13)
> Java HotSpot(TM) 64-Bit Server VM (build 24.55-b03, mixed mode)
> Reporter: Tim Allison
> Assignee: Andreas Lehmkühler
> Priority: Minor
> Attachments: 239665.pdf, PDFBOX-2101-298-good.jpg,
> PDFBOX-2101-714-poor.jpg, java.hprof.zip
>
>
> ExtractImages seems to fail to release memory resources on some files in both
> PDFBox 1.8.5 and trunk.
> On this file 4MB file
> [http://digitalcorpora.org/corp/nps/files/govdocs1/239/239665.pdf], if
> extracting every image on every page (and there are many, many duplicate
> images), there is an OOM with -Xmx1g. If there is no Xmx and there is > 2.5g
> available, ExtractImages will work.
> With some experimentation, the triggers seem to be JPEG images that have
> masks. I'm not sure, though, whether the issue is with PDFBox or Java.
> Commandlines:
> 1.8.5:
> java -Xmx1g -cp pdfbox-app-1.8.5.jar org.apache.pdfbox.ExtractImages
> 239665.pdf
> 2.0_SNAPSHOT:
> java -Xmx1g -cp pdfbox-app-2.0.0-SNAPSHOT.jar
> org.apache.pdfbox.tools.ExtractImages -addkey 239665.pdf
> Results:
> 1.8.5: 906 files before OOM
> {noformat}
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> at java.util.Arrays.copyOf(Arrays.java:2271)
> at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:113)
> at
> java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.ja
> va:93)
> at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:140)
> at
> org.apache.pdfbox.pdmodel.common.PDStream.getByteArray(PDStream.java:
> 514)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap.getRGBImage(PDP
> ixelMap.java:217)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap.write2OutputStr
> eam(PDPixelMap.java:363)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage.write2file(
> PDXObjectImage.java:254)
> at
> org.apache.pdfbox.ExtractImages.processResources(ExtractImages.java:2
> 02)
> at
> org.apache.pdfbox.ExtractImages.extractImages(ExtractImages.java:160)
> at org.apache.pdfbox.ExtractImages.main(ExtractImages.java:65)
> {noformat}
> 2.0_SNAPSHOT: 428 files before OOM
> {noformat}
> Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
> at java.util.Arrays.copyOf(Arrays.java:2271)
> at java.io.ByteArrayOutputStream.grow(ByteArrayOutputStream.java:113)
> at
> java.io.ByteArrayOutputStream.ensureCapacity(ByteArrayOutputStream.ja
> va:93)
> at java.io.ByteArrayOutputStream.write(ByteArrayOutputStream.java:140)
> at org.apache.pdfbox.io.IOUtils.copy(IOUtils.java:70)
> at org.apache.pdfbox.io.IOUtils.toByteArray(IOUtils.java:52)
> at
> org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.from8bit(
> SampledImageReader.java:171)
> at
> org.apache.pdfbox.pdmodel.graphics.image.SampledImageReader.getRGBIma
> ge(SampledImageReader.java:154)
> at
> org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject.getImage(PDIm
> ageXObject.java:171)
> at
> org.apache.pdfbox.tools.ExtractImages.write2file(ExtractImages.java:2
> 31)
> at
> org.apache.pdfbox.tools.ExtractImages.processResources(ExtractImages.
> java:206)
> at
> org.apache.pdfbox.tools.ExtractImages.extractImages(ExtractImages.jav
> a:164)
> at org.apache.pdfbox.tools.ExtractImages.main(ExtractImages.java:69)
> {noformat}
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