Well it turned out on large documents, the first byte does not get
written to the document stream fast enough, and the browser has a built
in 60 second timeout for links. This was causing a break in the
connection, in case anyone else experiences this.
csanders wrote:
I'm streaming an XSL-FO generated PDF to the user by passing tomcat's
OutputStream to the XSL-FO generator and am getting this error ( below
) when the PDF's get a little on the large side , anyone seen this
behavior before ?
java.lang.NullPointerException
at
org.apache.coyote.http11.InternalOutputBuffer.realWriteBytes(InternalOutputBuffer.java:747)
at
org.apache.tomcat.util.buf.ByteChunk.flushBuffer(ByteChunk.java:432)
at
org.apache.coyote.http11.InternalOutputBuffer.flush(InternalOutputBuffer.java:305)
at
org.apache.coyote.http11.Http11Processor.action(Http11Processor.java:992)
at org.apache.coyote.Response.action(Response.java:183)
at
org.apache.catalina.connector.OutputBuffer.doFlush(OutputBuffer.java:322)
at
org.apache.catalina.connector.OutputBuffer.flush(OutputBuffer.java:293)
at
org.apache.catalina.connector.CoyoteOutputStream.flush(CoyoteOutputStream.java:98)
at
org.apache.commons.io.output.ProxyOutputStream.flush(ProxyOutputStream.java:61)
at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:278)
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122)
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212)
at java.io.BufferedWriter.flush(BufferedWriter.java:236)
at
org.apache.fop.pdf.AbstractPDFStream.output(AbstractPDFStream.java:197)
at org.apache.fop.pdf.PDFStream.output(PDFStream.java:120)
at org.apache.fop.pdf.PDFDocument.output(PDFDocument.java:937)
at
org.apache.fop.render.pdf.PDFRenderer.renderPage(PDFRenderer.java:810)
at
org.apache.fop.area.RenderPagesModel.addPage(RenderPagesModel.java:113)
at
org.apache.fop.layoutmgr.AbstractPageSequenceLayoutManager.finishPage(AbstractPageSequenceLayoutManager.java:312)
at
org.apache.fop.layoutmgr.PageSequenceLayoutManager.finishPage(PageSequenceLayoutManager.java:167)
at
org.apache.fop.layoutmgr.AbstractPageSequenceLayoutManager.makeNewPage(AbstractPageSequenceLayoutManager.java:284)
at
org.apache.fop.layoutmgr.PageBreaker.handleBreakTrait(PageBreaker.java:494)
at
org.apache.fop.layoutmgr.PageBreaker.startPart(PageBreaker.java:398)
at
org.apache.fop.layoutmgr.AbstractBreaker.addAreas(AbstractBreaker.java:421)
at
org.apache.fop.layoutmgr.AbstractBreaker.addAreas(AbstractBreaker.java:371)
at
org.apache.fop.layoutmgr.PageBreaker.doPhase3(PageBreaker.java:262)
at
org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:346)
at
org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:264)
at
org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:106)
at
org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:234)
at
org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:123)
at
org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:340)
at
org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:169)
at
org.apache.xml.serializer.ToXMLSAXHandler.endElement(ToXMLSAXHandler.java:261)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1399)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2411)
at
org.apache.xalan.templates.ElemLiteralResult.execute(ElemLiteralResult.java:1374)
at
org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2411)
at
org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2281)
at
org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1367)
at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:709)
at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1284)
at
org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1262)
at
com.dnb.components.download.ReportGenerator.generatePDF(Unknown Source)
at
com.dnb.components.download.controllers.StreamDownloadController.execute(Unknown
Source)
at
com.dnb.components.web.velocity.VelocityRunner.run(VelocityRunner.java:67)
at
com.dnb.components.web.velocity.VelocityRunner.call(VelocityRunner.java:89)
at
java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)
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Thanks,
Charlie
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