FOP and <anchor>

[Maxime Bégnis <maxime@neodoc.biz>]

Hi list,

When I generate a FO file from the following XML, the transformation into a PDF file using FOP throws a java.lang.NullPointerException. I am unable to determine the cause of the problem. If I remove the <anchor xml:id="testid" /> element, things are working fine. I tried to setup a minimal FO file with the code generated by the anchor, but, surprisingly, the PDF is generated fine from this file. Note that I sent to FOP mailing list a copy of the stack trace. Maybe you can help me with that?

I have the same result with versions 1.75.2 and 1.76.0 of the style sheets and versions 0.95 and 1.0 of FOP.

Thanks a lot!

<?xml version="1.0" encoding="UTF-8"?>
<section version="5.0" xml:lang="en" xmlns="http://docbook.org/ns/docbook">
  <title>Test Section</title>

  <para>Some text <anchor xml:id="testid" />with an anchor.</para>
</section>

Stack trace of FOP 0.95 (for info) :

GRAVE: Exception
java.lang.NullPointerException
    at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:217)
    at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:125)
    at org.apache.fop.cli.Main.startFOP(Main.java:166)
    at org.apache.fop.cli.Main.main(Main.java:197)
Caused by: java.lang.NullPointerException
    at org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.applyChanges(InlineStackingLayoutManager.java:350)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.findHyphenationPoints(LineLayoutManager.java:1480)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.findOptimalBreakingPoints(LineLayoutManager.java:950)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.createLineBreaks(LineLayoutManager.java:917)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.getNextKnuthElements(LineLayoutManager.java:607)
    at org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:294)
    at org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:116)
    at org.apache.fop.layoutmgr.FlowLayoutManager.getNextKnuthElements(FlowLayoutManager.java:107)
    at org.apache.fop.layoutmgr.PageBreaker.getNextKnuthElements(PageBreaker.java:145)
    at org.apache.fop.layoutmgr.AbstractBreaker.getNextBlockList(AbstractBreaker.java:552)
    at org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:137)
    at org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:302)
    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$MainFOHandler.endElement(FOTreeBuilder.java:340)
    at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:169)
    at org.apache.xalan.transformer.TransformerIdentityImpl.endElement(TransformerIdentityImpl.java:1101)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at org.apache.xerces.xinclude.XIncludeHandler.endElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$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 org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
    at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:214)
    ... 3 more

---------

java.lang.NullPointerException
    at org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.applyChanges(InlineStackingLayoutManager.java:350)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.findHyphenationPoints(LineLayoutManager.java:1480)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.findOptimalBreakingPoints(LineLayoutManager.java:950)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.createLineBreaks(LineLayoutManager.java:917)
    at org.apache.fop.layoutmgr.inline.LineLayoutManager.getNextKnuthElements(LineLayoutManager.java:607)
    at org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:294)
    at org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:116)
    at org.apache.fop.layoutmgr.FlowLayoutManager.getNextKnuthElements(FlowLayoutManager.java:107)
    at org.apache.fop.layoutmgr.PageBreaker.getNextKnuthElements(PageBreaker.java:145)
    at org.apache.fop.layoutmgr.AbstractBreaker.getNextBlockList(AbstractBreaker.java:552)
    at org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:137)
    at org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:302)
    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$MainFOHandler.endElement(FOTreeBuilder.java:340)
    at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:169)
    at org.apache.xalan.transformer.TransformerIdentityImpl.endElement(TransformerIdentityImpl.java:1101)
    at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
    at org.apache.xerces.xinclude.XIncludeHandler.endElement(Unknown Source)
    at org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$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 org.apache.xalan.transformer.TransformerIdentityImpl.transform(TransformerIdentityImpl.java:484)
    at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:214)
    at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:125)
    at org.apache.fop.cli.Main.startFOP(Main.java:166)
    at org.apache.fop.cli.Main.main(Main.java:197)

Maxime Bégnis

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