PDF page export fails with: SandboxCrashedException: Sandbox has crashed while serving the request
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*Except Fisheye and Crucible
Summary
Try to export a page. The export fails and this message is shown in the page:
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Cause
java.lang.RuntimeException: com.atlassian.confluence.importexport.ImportExportException: We couldn't complete your export. There was an error converting the page "XXXXXXXXXXXXXXXXXXX". <a href="https://docs.atlassian.com/confluence/docs-74/PDF+export+in+Confluence+Data+Center">Learn more</a>
at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.doExecute(ExportPageAsPdfAction.java:56)Diagnosis
The atlassian-confluence.log will show this message:
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2019-11-12 14:10:17,231 ERROR [http-nio-8090-exec-4093] [atlassian.confluence.servlet.ConfluenceServletDispatcher] sendError Could not execute action
-- url: /spaces/flyingpdf/pdfpageexport.action | traceId: bc69ccc7d674fa38 | userName: XXXXXX | referer: https://<CONFLUENCE_URL>/page
java.lang.RuntimeException: com.atlassian.confluence.importexport.ImportExportException: We couldn't complete your export. There was an error converting the page "XXXXXXXXXXXXXXXXXXXXX". <a href="https://docs.atlassian.com/confluence/docs-74/PDF+export+in+Confluence+Data+Center">Learn more</a>
at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.doExecute(ExportPageAsPdfAction.java:56)
at com.atlassian.confluence.extra.flyingpdf.impl.PdfExportSemaphore.run(PdfExportSemaphore.java:28)
at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.execute(ExportPageAsPdfAction.java:29)
at com.opensymphony.xwork.DefaultActionInvocation.invoke(DefaultActionInvocation.java:168)
at java.lang.Thread.run(Thread.java:748)
Caused by: com.atlassian.confluence.importexport.ImportExportException: We couldn't complete your export. There was an error converting the page "XXXXXXXXXXXXXXXXXXXXX". <a href="https://docs.atlassian.com/confluence/docs-74/PDF+export+in+Confluence+Data+Center">Learn more</a>
at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxXmlToPdfConverter.convertXhtmlToPdf(SandboxXmlToPdfConverter.java:108)
at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxPdfExporterService.renderPdf(SandboxPdfExporterService.java:348)
at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxPdfExporterService.createPdf(SandboxPdfExporterService.java:334)
at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxPdfExporterService.createPdfForPage(SandboxPdfExporterService.java:224)
at com.atlassian.confluence.extra.flyingpdf.impl.DelegatingPdfExporterService.createPdfForPage(DelegatingPdfExporterService.java:54)
at com.atlassian.confluence.extra.flyingpdf.impl.DiagnosticPdfExporterService.createPdfForPage(DiagnosticPdfExporterService.java:88)
at com.atlassian.confluence.extra.flyingpdf.impl.ExportPageAsPdfAction.doExecute(ExportPageAsPdfAction.java:36)
... 396 more
Caused by: com.atlassian.confluence.util.sandbox.SandboxCrashedException: Sandbox has crashed while serving the request
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.tryToThrowSpecificException(SandboxProcess.java:230)
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.execute(SandboxProcess.java:159)
at com.atlassian.confluence.impl.util.sandbox.DefaultSandboxPool.execute(DefaultSandboxPool.java:116)
at com.atlassian.confluence.impl.util.sandbox.ConfluenceSandboxPoolFactory$LazySandbox.execute(ConfluenceSandboxPoolFactory.java:72)
at com.atlassian.confluence.impl.util.sandbox.DefaultSandbox.execute(DefaultSandbox.java:36)
at com.atlassian.confluence.extra.flyingpdf.sandbox.PdfExportSandbox.execute(PdfExportSandbox.java:49)
at com.atlassian.confluence.extra.flyingpdf.sandbox.SandboxXmlToPdfConverter.convertXhtmlToPdf(SandboxXmlToPdfConverter.java:81)
... 402 more
Caused by: java.io.EOFException
at java.io.DataInputStream.readInt(DataInputStream.java:392)
at com.atlassian.confluence.impl.util.sandbox.SandboxMessage.receiveMessage(SandboxMessage.java:42)
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.receiveMessage(SandboxProcess.java:283)
at com.atlassian.confluence.impl.util.sandbox.SandboxProcess.execute(SandboxProcess.java:156)
... 407 more
To get even more details, it's possible to increase the PDF Sandbox class to debug:
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com.atlassian.confluence.impl.util.sandboxWith the logs in debug, the atlassian-confluence.log will show this message right before the main exception above:
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2020-12-07 15:12:46,961 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
2020-12-07 15:12:46,961 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:92)
2020-12-07 15:12:46,961 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:445)
2020-12-07 15:12:46,961 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at java.awt.image.Raster.createWritableRaster(Raster.java:941)
2020-12-07 15:12:46,961 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at javax.imageio.ImageTypeSpecifier.createBufferedImage(ImageTypeSpecifier.java:1074)
2020-12-07 15:12:46,961 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at javax.imageio.ImageReader.getDestination(ImageReader.java:2892)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at com.sun.imageio.plugins.png.PNGImageReader.readImage(PNGImageReader.java:1317)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at com.sun.imageio.plugins.png.PNGImageReader.read(PNGImageReader.java:1614)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at javax.imageio.ImageIO.read(ImageIO.java:1462)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at javax.imageio.ImageIO.read(ImageIO.java:1357)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at com.atlassian.confluence.extra.flyingpdf.impl.LightITextFSImage.getImage(LightITextFSImage.java:193)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextOutputDevice.drawImage(ITextOutputDevice.java:828)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextImageElement.paint(ITextImageElement.java:72)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextOutputDevice.paintReplacedElement(ITextOutputDevice.java:199)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.layout.Layer.paintReplacedElement(Layer.java:540)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.layout.Layer.paintReplacedElements(Layer.java:497)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.layout.Layer.paintAsLayer(Layer.java:471)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.render.BlockBox.paintInline(BlockBox.java:265)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.layout.Layer.paintInlineContent(Layer.java:274)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.layout.Layer.paint(Layer.java:332)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextRenderer.paintPage(ITextRenderer.java:432)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextRenderer.writePDF(ITextRenderer.java:380)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextRenderer.createPDF(ITextRenderer.java:333)
2020-12-07 15:12:46,962 INFO [sandbox-logger] [impl.util.sandbox.ConversionSandbox] lambda$static$0 worker0: at org.xhtmlrenderer.pdf.ITextRenderer.createPDF(ITextRenderer.java:265)Cause
The PDF export is processed by Confluence in a separate Java process to avoid problems with the main Confluence process. The Sandbox process has a limited memory to use. By default the process can use up to 512 MB, however, depending on the page size and complexity, this amount of memory is not enough, causing the Sandbox to crash during the export.
Solution
If the affected page has a Draw.io diagrams and the version is 9.15.0 or lower, update it to the latest version
Increase the memory available for the Sandbox with the parameter conversion.sandbox.memory.limit.megabytes as described in Configuring System Properties.
Example for setting the limit to 1GB in Linux (
<Confluence_Install>/bin/setenv.sh)1CATALINA_OPTS="-Dconversion.sandbox.memory.limit.megabytes=1024 ${CATALINA_OPTS}"Example of setting the limit to 1GB in Windows (when Confluence is started via
start-confluence.bat) (<Confluence_Install>\bin\setenv.bat)1set CATALINA_OPTS=-Dconversion.sandbox.memory.limit.megabytes=1024 %CATALINA_OPTS%Example of setting the limit to 1GB in Windows Service
Follow the steps here and append the line below into the Java Option as a new line:
1-Dconversion.sandbox.memory.limit.megabytes=1024
Updated on March 3, 2025
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