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https://issues.apache.org/jira/browse/FOP-1776?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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simon steiner updated FOP-1776:
-------------------------------
    Priority: Major  (was: Blocker)

> NPE caused by nested empty fo:inline with id
> --------------------------------------------
>
>                 Key: FOP-1776
>                 URL: https://issues.apache.org/jira/browse/FOP-1776
>             Project: FOP
>          Issue Type: Bug
>          Components: layout/inline
>    Affects Versions: trunk
>         Environment: Operating System: All
> Platform: All
>            Reporter: Mathieu Malaterre
>         Attachments: anchor.id.patch, test2.fo, _test.fo
>
>
> Here is my input docbook file:
> <?xml version='1.0' encoding='UTF-8'?>
> <!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
> "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd"; []>
> <article>
> <section>
>  <title>title</title>
> <blockquote>
> <para>
> The <emphasis role="bold"><anchor
> id="example.anchor.1"/>anchor</emphasis> element is empty and
> contributes
> nothing to the flow of the content in which it occurs.  It is only useful
> as a target.
> </para>
> </blockquote>
> </section>
> </article>
> which I process with:
> /usr/bin/xsltproc --stringparam fop1.extensions 1 --stringparam
> ulink.show 0 --xinclude -o test2.fo
> /usr/share/xml/docbook/stylesheet/nwalsh/fo/docbook.xsl test2.xml
> and lead to:
> $ ./fop test2.fo test2.pdf
> Feb 17, 2010 2:52:18 PM org.apache.fop.apps.FOURIResolver resolve
> SEVERE: Error with opening URL
> 'http://docbook.sourceforge.net/release/images/draft.png': Network is
> unreachable
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:9588)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:10285)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:10980)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:11672)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:12361)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:13050)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:13736)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:14427)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:15118)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:15806)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:16496)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:17186)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:17873)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:18563)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:19253)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:19940)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:20631)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:21322)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> SEVERE: Image not found. URI:
> http://docbook.sourceforge.net/release/images/draft.png. (See position
> 2:22010)
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> WARNING: Font "Symbol,normal,700" not found. Substituting with
> "Symbol,normal,400".
> Feb 17, 2010 2:52:18 PM org.apache.fop.events.LoggingEventListener 
> processEvent
> WARNING: Font "ZapfDingbats,normal,700" not found. Substituting with
> "ZapfDingbats,normal,400".
> Feb 17, 2010 2:52:18 PM org.apache.fop.cli.Main startFOP
> SEVERE: Exception
> java.lang.NullPointerException
>        at org.apache.fop.cli.InputHandler.transformTo(InputHandler.java:302)
>        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
>        at org.apache.fop.cli.Main.startFOP(Main.java:174)
>        at org.apache.fop.cli.Main.main(Main.java:205)
> ---------
> java.lang.NullPointerException
>        at 
> org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.getChangedKnuthElements(InlineStackingLayoutManager.java:375)
>        at 
> org.apache.fop.layoutmgr.inline.InlineLayoutManager.getChangedKnuthElements(InlineLayoutManager.java:537)
>        at 
> org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.getChangedKnuthElements(InlineStackingLayoutManager.java:380)
>        at 
> org.apache.fop.layoutmgr.inline.InlineLayoutManager.getChangedKnuthElements(InlineLayoutManager.java:537)
>        at 
> org.apache.fop.layoutmgr.inline.LineLayoutManager.findHyphenationPoints(LineLayoutManager.java:1359)
>        at 
> org.apache.fop.layoutmgr.inline.LineLayoutManager.findOptimalBreakingPoints(LineLayoutManager.java:797)
>        at 
> org.apache.fop.layoutmgr.inline.LineLayoutManager.createLineBreaks(LineLayoutManager.java:763)
>        at 
> org.apache.fop.layoutmgr.inline.LineLayoutManager.getNextKnuthElements(LineLayoutManager.java:592)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:571)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:552)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:280)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:123)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:115)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:571)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:552)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:280)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:123)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:115)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:571)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:552)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:280)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:123)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:115)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:571)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextChildElements(BlockStackingLayoutManager.java:552)
>        at 
> org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:280)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:123)
>        at 
> org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:115)
>        at 
> org.apache.fop.layoutmgr.FlowLayoutManager.getNextChildElements(FlowLayoutManager.java:199)
>        at 
> org.apache.fop.layoutmgr.FlowLayoutManager.addChildElements(FlowLayoutManager.java:140)
>        at 
> org.apache.fop.layoutmgr.FlowLayoutManager.addChildElements(FlowLayoutManager.java:129)
>        at 
> org.apache.fop.layoutmgr.FlowLayoutManager.getNextKnuthElements(FlowLayoutManager.java:70)
>        at 
> org.apache.fop.layoutmgr.PageBreaker.getNextKnuthElements(PageBreaker.java:216)
>        at 
> org.apache.fop.layoutmgr.AbstractBreaker.getNextBlockList(AbstractBreaker.java:692)
>        at 
> org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:149)
>        at 
> org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:132)
>        at 
> org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:337)
>        at org.apache.fop.layoutmgr.PageBreaker.doLayout(PageBreaker.java:85)
>        at 
> org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:107)
>        at 
> org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:238)
>        at 
> org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:120)
>        at 
> org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:349)
>        at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:177)
>        at 
> org.apache.xalan.transformer.TransformerIdentityImpl.endElement(TransformerIdentityImpl.java:1101)
>        at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown 
> Source)
>        at org.apache.xerces.xinclude.XIncludeHandler.endElement(Unknown 
> Source)
>        at 
> org.apache.xerces.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown
> Source)
>        at 
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$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:299)
>        at org.apache.fop.cli.InputHandler.renderTo(InputHandler.java:130)
>        at org.apache.fop.cli.Main.startFOP(Main.java:174)
>        at org.apache.fop.cli.Main.main(Main.java:205)



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