Problem

• When exporting a page or space to PDF, it doesn't succeed and causes a high load on Confluence until it triggers an OutOfMemory Error.

• When exporting a single page, the process hangs and ultimately fails. The "System Error" page is displayed and the following appears in the atlassian-confluence.log:

  2012-04-19 17:22:06,698 ERROR [http-8080-3] [[Standalone].[localhost].[/confluence].[action]] log Servlet.service() for servlet action threw exception
  java.lang.OutOfMemoryError: Java heap space
      at java.util.LinkedList.addBefore(LinkedList.java:778)
      at java.util.LinkedList.add(LinkedList.java:198)
      at org.xhtmlrenderer.css.newmatch.CascadedStyle.addProperties(CascadedStyle.java:148)
      at org.xhtmlrenderer.css.newmatch.CascadedStyle.<init>(CascadedStyle.java:135)
      at org.xhtmlrenderer.css.newmatch.Matcher.getPageCascadedStyle(Matcher.java:121)
      at org.xhtmlrenderer.context.StyleReference.getPageStyle(StyleReference.java:203)
      at org.xhtmlrenderer.layout.Layer.createPageBox(Layer.java:794)
      at org.xhtmlrenderer.layout.Layer.addPage(Layer.java:764)
      at org.xhtmlrenderer.layout.Layer.addPagesUntilPosition(Layer.java:875)
      at org.xhtmlrenderer.layout.Layer.getPage(Layer.java:861)
      at org.xhtmlrenderer.layout.Layer.getFirstPage(Layer.java:805)
      at org.xhtmlrenderer.render.BlockBox.layout(BlockBox.java:774)
      at org.xhtmlrenderer.render.BlockBox.layout(BlockBox.java:735)
      at org.xhtmlrenderer.pdf.ITextRenderer.layout(ITextRenderer.java:209)
      at com.atlassian.confluence.extra.flyingpdf.FlyingSaucerXmlToPdfConverter.convertXhtmlToPdf(FlyingSaucerXmlToPdfConverter.java:92)
      at com.atlassian.confluence.extra.flyingpdf.FlyingSaucerXmlToPdfConverter.convertXhtmlToPdf(FlyingSaucerXmlToPdfConverter.java:38)
      at com.atlassian.confluence.extra.flyingpdf.FlyingSaucerPdfExporterService.createPdfForPage(FlyingSaucerPdfExporterService.java:78)
      at com.atlassian.confluence.extra.flyingpdf.ExportPageAsPdfAction.execute(ExportPageAsPdfAction.java:28)
  ....

• When exporting a space to PDF, it becomes stuck at Begin conversion of intermediate HTML to PDF:
  
  The following appears in the atlassian-confluence.log:

  2012-04-19 17:02:40,878 ERROR [Long running task: PDF Space Export] [content.render.xhtml.DefaultRenderer] render Error rendering content for view: RuntimeException occurred while performing an XHTML storage transformation (null)
   -- referer: http://localhost:8080/confluence/spaces/flyingpdf/flyingpdf.action?key=SBX | url: /confluence/spaces/flyingpdf/doflyingpdf.action | userName: admin | action: doflyingpdf
  com.atlassian.confluence.content.render.xhtml.XhtmlException: RuntimeException occurred while performing an XHTML storage transformation (null)
      at com.atlassian.confluence.content.render.xhtml.storage.StorageXhtmlTransformer.transform(StorageXhtmlTransformer.java:60)
      at com.atlassian.confluence.content.render.xhtml.TransformerChain.transform(TransformerChain.java:41)
      at com.atlassian.confluence.content.render.xhtml.PluggableTransformerChain.transform(PluggableTransformerChain.java:53)
      at com.atlassian.confluence.content.render.xhtml.DefaultRenderer.render(DefaultRenderer.java:63)
      at com.atlassian.confluence.content.render.xhtml.DefaultRenderer.render(DefaultRenderer.java:51)
      at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.renderToHtml(RenderedXhtmlBuilder.java:377)
      at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.renderContentTreeNodes(RenderedXhtmlBuilder.java:346)
      at com.atlassian.confluence.extra.flyingpdf.html.RenderedXhtmlBuilder.buildHtml(RenderedXhtmlBuilder.java:134)
      at com.atlassian.confluence.extra.flyingpdf.FlyingSaucerPdfExporterService.createPdfForSpace(FlyingSaucerPdfExporterService.java:50)
      at com.atlassian.confluence.extra.flyingpdf.PdfExportLongRunningTask$1.doInTransactionWithoutResult(PdfExportLongRunningTask.java:70)
      at org.springframework.transaction.support.TransactionCallbackWithoutResult.doInTransaction(TransactionCallbackWithoutResult.java:33)
      at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:128)
      at com.atlassian.confluence.extra.flyingpdf.PdfExportLongRunningTask.runInternal(PdfExportLongRunningTask.java:52)
      at com.atlassian.confluence.util.longrunning.ConfluenceAbstractLongRunningTask.run(ConfluenceAbstractLongRunningTask.java:21)
      at com.atlassian.confluence.util.longrunning.ManagedTask.run(ManagedTask.java:35)
      at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
      at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
      at java.util.concurrent.FutureTask.run(FutureTask.java:138)
      at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
      at java.lang.Thread.run(Thread.java:662)
  Caused by: java.lang.NullPointerException
      at com.atlassian.confluence.content.render.xhtml.editor.macro.DefaultPlaceholderUrlFactory.getUrlForErrorPlaceholder(DefaultPlaceholderUrlFactory.java:73)
      at com.atlassian.confluence.content.render.xhtml.transformers.TransformErrorToHtmlPlaceholder.handle(TransformErrorToHtmlPlaceholder.java:54)
      at com.atlassian.confluence.content.render.xhtml.transformers.DefaultFragmentTransformer.transform(DefaultFragmentTransformer.java:124)
      at com.atlassian.confluence.content.render.xhtml.storage.StorageXhtmlTransformer.transform(StorageXhtmlTransformer.java:43)
      ... 20 more

Cause

This is normally caused by an incompatible or problematic PDF stylesheet. Particularly the following CSS, if the value for margin is bigger than 5in:

@page 
{
    margin: 5.5in;
}

This bug is being tracked at CONF-25278 - Getting issue details... STATUS .

Workaround

Remove or reset the PDF stylesheets. You can base your customisations on the default CSS rules of the PDF stylesheet: confluencedefaultpdf.css.