Error during PDF Conversion

[java_dev]

Hi,
I'm using a multi-threaded process to create PDF documents from word templates. After a few successful conversions, the Docx.toFO call gives the below error. Kindly help me through this.

Code: Select all

org.docx4j.openpackaging.exceptions.Docx4JException: Exception exporting package
   at org.docx4j.convert.out.common.AbstractExporter.export(AbstractExporter.java:96)
   at org.docx4j.Docx4J.toFO(Docx4J.java:467)
   at com.templateMerger.TemplateMergerUtil.saveToPDF(TemplateMergerUtil.java:232)
   at com.templateMerger.TemplateMergerUtil.mergeToTemplate(TemplateMergerUtil.java:200)
   at com.templateMerger.TemplateProcessor.run(TemplateProcessor.java:213)
   at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:896)
   at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
   at java.lang.Thread.run(Thread.java:735)
Caused by: java.lang.NullPointerException
   at java.util.AbstractList$SimpleListIterator.hasNext(Unknown Source)
   at org.apache.fop.fonts.truetype.TTFFile.readKerning(TTFFile.java:1678)
   at org.apache.fop.fonts.truetype.TTFFile.readFont(TTFFile.java:730)
   at org.apache.fop.fonts.truetype.TTFFontLoader.read(TTFFontLoader.java:105)
   at org.apache.fop.fonts.truetype.TTFFontLoader.read(TTFFontLoader.java:91)
   at org.apache.fop.fonts.FontLoader.getFont(FontLoader.java:205)
   at org.apache.fop.fonts.FontLoader.loadFont(FontLoader.java:154)
   at org.apache.fop.fonts.LazyFont.load(LazyFont.java:151)
   at org.apache.fop.fonts.LazyFont.hasChar(LazyFont.java:210)
   at org.apache.fop.fonts.Font.hasChar(Font.java:261)
   at org.apache.fop.fonts.FontSelector.selectFontForCharacter(FontSelector.java:46)
   at org.apache.fop.fonts.FontSelector.selectFontForCharacterInText(FontSelector.java:84)
   at org.apache.fop.layoutmgr.inline.TextLayoutManager.initialize(TextLayoutManager.java:235)
   at org.apache.fop.layoutmgr.AbstractLayoutManager.getChildLM(AbstractLayoutManager.java:119)
   at org.apache.fop.layoutmgr.BreakOpportunityHelper.getBreakBefore(BreakOpportunityHelper.java:45)
   at org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.getBreakBefore(InlineStackingLayoutManager.java:392)
   at org.apache.fop.layoutmgr.BreakOpportunityHelper.getBreakBefore(BreakOpportunityHelper.java:49)
   at org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.getBreakBefore(InlineStackingLayoutManager.java:392)
   at org.apache.fop.layoutmgr.BreakOpportunityHelper.getBreakBefore(BreakOpportunityHelper.java:49)
   at org.apache.fop.layoutmgr.inline.InlineStackingLayoutManager.getBreakBefore(InlineStackingLayoutManager.java:392)
   at org.apache.fop.layoutmgr.BreakOpportunityHelper.getBreakBefore(BreakOpportunityHelper.java:49)
   at org.apache.fop.layoutmgr.BlockStackingLayoutManager.addKnuthElementsForBreakBefore(BlockStackingLayoutManager.java:1038)
   at org.apache.fop.layoutmgr.BlockStackingLayoutManager.breakBeforeServed(BlockStackingLayoutManager.java:443)
   at org.apache.fop.layoutmgr.BlockStackingLayoutManager.getNextKnuthElements(BlockStackingLayoutManager.java:253)
   at org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:113)
   at org.apache.fop.layoutmgr.BlockLayoutManager.getNextKnuthElements(BlockLayoutManager.java:105)
   at org.apache.fop.layoutmgr.table.TableCellLayoutManager.getNextKnuthElements(TableCellLayoutManager.java:153)
   at org.apache.fop.layoutmgr.table.RowGroupLayoutManager.createElementsForRowGroup(RowGroupLayoutManager.java:120)
   at org.apache.fop.layoutmgr.table.RowGroupLayoutManager.getNextKnuthElements(RowGroupLayoutManager.java:63)
   at org.apache.fop.layoutmgr.table.TableContentLayoutManager.getKnuthElementsForRowIterator(TableContentLayoutManager.java:228)
   at org.apache.fop.layoutmgr.table.TableContentLayoutManager.getNextKnuthElements(TableContentLayoutManager.java:181)
   at org.apache.fop.layoutmgr.table.TableLayoutManager.getNextKnuthElements(TableLayoutManager.java:253)
   at org.apache.fop.layoutmgr.FlowLayoutManager.getNextChildElements(FlowLayoutManager.java:221)
   at org.apache.fop.layoutmgr.FlowLayoutManager.addChildElements(FlowLayoutManager.java:145)
   at org.apache.fop.layoutmgr.FlowLayoutManager.getNextKnuthElements(FlowLayoutManager.java:114)
   at org.apache.fop.layoutmgr.FlowLayoutManager.getNextKnuthElements(FlowLayoutManager.java:67)
   at org.apache.fop.layoutmgr.PageBreaker.getNextKnuthElements(PageBreaker.java:222)
   at org.apache.fop.layoutmgr.AbstractBreaker.getNextBlockList(AbstractBreaker.java:673)
   at org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:155)
   at org.apache.fop.layoutmgr.PageBreaker.getNextBlockList(PageBreaker.java:137)
   at org.apache.fop.layoutmgr.AbstractBreaker.doLayout(AbstractBreaker.java:387)
   at org.apache.fop.layoutmgr.PageBreaker.doLayout(PageBreaker.java:90)
   at org.apache.fop.layoutmgr.PageSequenceLayoutManager.activateLayout(PageSequenceLayoutManager.java:113)
   at org.apache.fop.area.AreaTreeHandler.endPageSequence(AreaTreeHandler.java:267)
   at org.apache.fop.fo.pagination.PageSequence.endOfNode(PageSequence.java:128)
   at org.apache.fop.fo.FOTreeBuilder$MainFOHandler.endElement(FOTreeBuilder.java:347)
   at org.apache.fop.fo.FOTreeBuilder.endElement(FOTreeBuilder.java:181)
   at org.apache.xalan.transformer.TransformerIdentityImpl.endElement(Unknown Source)
   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.xalan.transformer.TransformerIdentityImpl.transform(Unknown Source)
   at org.docx4j.convert.out.fo.renderers.FORendererApacheFOP.render(FORendererApacheFOP.java:211)
   at org.docx4j.convert.out.fo.renderers.FORendererApacheFOP.render(FORendererApacheFOP.java:158)
   at org.docx4j.convert.out.fo.AbstractFOExporter.postprocess(AbstractFOExporter.java:139)
   at org.docx4j.convert.out.fo.AbstractFOExporter.postprocess(AbstractFOExporter.java:47)
   at org.docx4j.convert.out.common.AbstractExporter.export(AbstractExporter.java:81)
   ... 7 more

[jason]

First, try to determine whether it is an issue related to multi-threading FOP, or to do with the particular fonts in a specific document.

The latter seems more likely. A true type font with unusual/missing kerning info?

Since this is happening from org.docx4j.convert.out.fo.AbstractFOExporter.postprocess, you can configure docx4j to capture the FO it generates in a file

Syntax: [ Download ] [ Hide ]

Syntax: [ Download ] [ Show ]

Using java Syntax Highlighting

        FOSettings foSettings = Docx4J.createFOSettings();
        foSettings.setFoDumpFile(new java.io.File(inputfilepath + ".fo"));
 

Parsed in 0.014 seconds, using GeSHi 1.0.8.4

then you can try running that through FOP independent of docx4j.

You'll also need docx4j's FOP settings file, which is created dynamically. To see it, turn on debug level logging for org.docx4j.fonts.fop.util.FopConfigUtil

[java_dev]

Thanks Jason. I'll try that approach.

Is there a method in Docx4J which could directly convert the fo file to PDF? Please let me know.