M.H. created FOP-2914:
-------------------------
Summary: NPE during FO 2 IF transformation with
instream-foreign-object using Saxon
Key: FOP-2914
URL: https://issues.apache.org/jira/browse/FOP-2914
Project: FOP
Issue Type: Bug
Environment: Windows 10, OpenJDK 11.0.2, Fop 2.3 (Fop 2.4)
Reporter: M.H.
So far, we used Xalan (2.7.2) as the XSLT Processor to transform our XML/XSL to
FO and further ti IF (intermediate format) to concat these to one file that is
finally rendered to PDF (to avoid multiple fonts via PDF concatenation). We now
have a current version of a 3rd party library that breaks our app because of
Xalan (known bug:
[https://stackoverflow.com/questions/45152707/transformerfactory-and-xalan-dependency-conflict])
. So we investigated a lot of time, adjusted our XMl APIs, converted to JAXB,
removed Xalan and werent able to use the JDK 11 internal XSLT processor becuase
our (hundreds of) XSLTs don't work because they only seem to work with a "lazy"
XSLT processor like Xalan. For this reason we evaluate the Saxon XSLT
processor. With *Saxon*, most things work again except one bug:
We (have to) include SVG files with instream-foreign-object:
{code:xml}
<fo:instream-foreign-object>
<svg:svg xmlns="http://www.w3.org/2000/svg";
xmlns:xlink="http://www.w3.org/1999/xlink"; width="120mm" height="120mm" >
<svg:image xmlns:xlink="http://www.w3.org/1999/xlink"; xlink:href="Test.svg"
width="120mm" height="120mm"/>
</svg:svg>
</fo:instream-foreign-object>
{code}
And during the transformation of the FO to Apaches intermediate format IF, a
NullPointerException occurs:
{code:java}
Error while rendering page 1. Reason: java.lang.NullPointerException at
org.apache.fop.events.EventExceptionManager.throwException(EventExceptionManager.java:74)
at
org.apache.fop.events.DefaultEventBroadcaster$1.invoke(DefaultEventBroadcaster.java:173)
at com.sun.proxy.$Proxy11.pageRenderingError(Unknown Source) at
org.apache.fop.area.RenderPagesModel.renderPage(RenderPagesModel.java:206)
at
org.apache.fop.area.RenderPagesModel.checkPreparedPages(RenderPagesModel.java:174)
at org.apache.fop.area.RenderPagesModel.addPage(RenderPagesModel.java:146)
at
org.apache.fop.layoutmgr.AbstractPageSequenceLayoutManager.finishPage(AbstractPageSequenceLayoutManager.java:316)
at
org.apache.fop.layoutmgr.PageSequenceLayoutManager.finishPage(PageSequenceLayoutManager.java:243)
at
org.apache.fop.layoutmgr.AbstractPageSequenceLayoutManager.makeNewPage(AbstractPageSequenceLayoutManager.java:287)
at
org.apache.fop.layoutmgr.PageSequenceLayoutManager.makeNewPage(PageSequenceLayoutManager.java:192)
at
org.apache.fop.layoutmgr.PageBreaker.handleBreakTrait(PageBreaker.java:633)
at org.apache.fop.layoutmgr.PageBreaker.startPart(PageBreaker.java:511) at
org.apache.fop.layoutmgr.AbstractBreaker.addAreas(AbstractBreaker.java:659)
at org.apache.fop.layoutmgr.AbstractBreaker.addAreas(AbstractBreaker.java:604)
at
org.apache.fop.layoutmgr.AbstractBreaker.addAreas(AbstractBreaker.java:599)
at org.apache.fop.layoutmgr.PageBreaker.doPhase3(PageBreaker.java:338) at
org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:458)
at org.apache.fop.layoutmgr.PageBreaker.doLayout(PageBreaker.java:112) at
org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:143)
at
org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:267)
at org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:130)
at
org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:360)
at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:190)
at de.icomps.xml.FOP$HandlerXML.endElement(FOP.java:1624) at
net.sf.saxon.event.ContentHandlerProxy.endElement(ContentHandlerProxy.java:412)
at net.sf.saxon.event.ProxyReceiver.endElement(ProxyReceiver.java:185)
at
net.sf.saxon.event.SequenceNormalizer.endElement(SequenceNormalizer.java:230)
at
net.sf.saxon.event.ReceivingContentHandler.endElement(ReceivingContentHandler.java:528)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
Source) at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown
Source) at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown
Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown
Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at
org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source) at
org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at
net.sf.saxon.event.Sender.sendSAXSource(Sender.java:435) at
net.sf.saxon.event.Sender.send(Sender.java:167) at
net.sf.saxon.jaxp.IdentityTransformer.transform(IdentityTransformer.java:368)
at de.icomps.xml.FOP.transformFO(FOP.java:1055) at
de.icomps.xml.FOP.fo2IF(FOP.java:789) at
de.icomps.rep.Report.createWithFOP(Report.java:3772) at
de.icomps.rep.Report.processReport(Report.java:2078) at
de.icomps.rep.ReportClient.createClientReport(ReportClient.java:266) at
de.icomps.rep.ReportClientMulti.genClientReportSingle(ReportClientMulti.java:2537)
at
de.icomps.rep.ReportClientMulti.genClientReports(ReportClientMulti.java:1804)
at de.icomps.rep.ReportClientMulti.createReport(ReportClientMulti.java:288)
at de.icomps.rep.Report.startProcessing(Report.java:1548) at
de.icomps.ijs.JobTask.startJob(JobTask.java:412) at
de.icomps.ijs.JobTask.run(JobTask.java:154) at
java.base/java.lang.Thread.run(Thread.java:834) Caused by:
java.lang.NullPointerException at
net.sf.saxon.event.ReceivingContentHandler.getNodeName(ReceivingContentHandler.java:485)
at
net.sf.saxon.event.ReceivingContentHandler.startElement(ReceivingContentHandler.java:398)
at
org.apache.fop.util.DelegatingContentHandler.startElement(DelegatingContentHandler.java:185)
at org.apache.fop.util.DOM2SAX.writeNode(DOM2SAX.java:263) at
org.apache.fop.util.DOM2SAX.writeDocument(DOM2SAX.java:73) at
org.apache.fop.render.intermediate.IFSerializer.drawImage(IFSerializer.java:508)
at
org.apache.fop.render.intermediate.IFRenderer.renderForeignObject(IFRenderer.java:1312)
at
org.apache.fop.render.AbstractRenderer.renderInlineViewport(AbstractRenderer.java:864)
at
org.apache.fop.render.AbstractPathOrientedRenderer.renderInlineViewport(AbstractPathOrientedRenderer.java:831)
at
org.apache.fop.render.intermediate.IFRenderer.renderInlineViewport(IFRenderer.java:862)
at
org.apache.fop.render.AbstractRenderer.renderInlineArea(AbstractRenderer.java:717)
at
org.apache.fop.render.intermediate.IFRenderer.renderInlineArea(IFRenderer.java:926)
at
org.apache.fop.render.AbstractRenderer.renderLineArea(AbstractRenderer.java:692)
at
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:573)
at
org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:615)
at
org.apache.fop.render.intermediate.IFRenderer.renderBlock(IFRenderer.java:998)
at
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:558)
at
org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:615)
at
org.apache.fop.render.intermediate.IFRenderer.renderBlock(IFRenderer.java:998)
at
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:558)
at
org.apache.fop.render.AbstractPathOrientedRenderer.renderReferenceArea(AbstractPathOrientedRenderer.java:756)
at
org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:601)
at
org.apache.fop.render.intermediate.IFRenderer.renderBlock(IFRenderer.java:998)
at
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:558)
at
org.apache.fop.render.AbstractRenderer.renderBlock(AbstractRenderer.java:615)
at
org.apache.fop.render.intermediate.IFRenderer.renderBlock(IFRenderer.java:998)
at
org.apache.fop.render.AbstractRenderer.renderBlocks(AbstractRenderer.java:558)
at
org.apache.fop.render.AbstractRenderer.renderFlow(AbstractRenderer.java:459)
at
org.apache.fop.render.AbstractPathOrientedRenderer.renderFlow(AbstractPathOrientedRenderer.java:784)
at
org.apache.fop.render.AbstractRenderer.renderMainReference(AbstractRenderer.java:436)
at
org.apache.fop.render.AbstractRenderer.renderBodyRegion(AbstractRenderer.java:360)
at
org.apache.fop.render.AbstractRenderer.renderRegionViewport(AbstractRenderer.java:307)
at
org.apache.fop.render.intermediate.IFRenderer.renderRegionViewport(IFRenderer.java:737)
at
org.apache.fop.render.AbstractRenderer.renderPageAreas(AbstractRenderer.java:272)
at
org.apache.fop.render.AbstractRenderer.renderPage(AbstractRenderer.java:245)
at
org.apache.fop.render.intermediate.IFRenderer.renderPage(IFRenderer.java:587)
at org.apache.fop.area.RenderPagesModel.renderPage(RenderPagesModel.java:193)
... 48 more
{code}
Trying
{code:xml}
<fo:external-graphic height="120mm" width="120mm" src="Test.svg"/> {code}
the error does not occur, but the output is wrong (SVG is not displayed
correctly - this was the case already years ago with FOP 0.95, etc.).
We tested with our current FOP 2.3 and also with the latest FOP 2.4; used
different SVG files, fiddled with several parameters of instream-foreign-object
/ svg:svg / svg: image, ....always same error.
So we and up not being able to use JDK internal or Xalan XSLT processor and are
stuck with Saxon at this single NullPointerException during FO to IF
transaformation.
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