FO to PDF/a Conversion with Apache FOP Java Library

Question

I'm trying to convert .fo files to PDF/a with Apache FOP 2.1 with the exemple code given in the documentation. I managed to convert the helloworld.fo file into PDF but, when I tried to convert it into PDF/a file I get this error:

org.apache.fop.pdf.PDFConformanceException: For PDF/A-1a, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica

That's why I tried to embedded fonts in the fop.xconf file:

  <fonts> <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/arial.ttf" name="Arial"> <font-triplet name="Arial" style="normal" weight="700"/> </font> <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/arialbd.ttf" name="Arial Bold"> <font-triplet name="Arial" style="normal" weight="bold"/> </font> <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/ariali.ttf" name="Arial Italique"> <font-triplet name="Arial" style="italic" weight="700"/> </font> <font kerning="yes" embed-url="C:/Users/thinkpad/workspace/FopConverter/Fonts/arialbi.ttf" name="Helvetica Bold Italique"> <font-triplet name="Arial" style="italic" weight="bold"/> </font> <directory>C:\\Users\\thinkpad\\workspace\\FopConverter\\Fonts</directory> <directory>C:\\Users\\thinkpad\\workspace\\FopConverter\\Fonts\\ghostFonts</directory> <substitutions> <substitution> <from font-family="Helvetica" font-weight="700..900"/> <to font-family="Arial"/> </substitution> </substitutions> <auto-detect/> </fonts> 

But even after doing so I still have the same error: org.apache.fop.pdf.PDFConformanceException: For PDF/A-1a, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica org.apache.fop.pdf.PDFConformanceException: For PDF/A-1a, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica

I also tried to modify the helloworld.fo by adding font-family="Helvetica" font-weight="normal" font-style="normal" in the <fo:root"> because some forum topic said to do so but it didn't changed anything.

Please, help me in solving my embedding font error. Thank for reading this topic.

[EDIT]: Here is the entire error message:

FOP ExampleFO2PDF

Preparing...
Input: XSL-FO (.\xml\fo\helloworld.fo)
Output: PDF (.\out\ResultFO2PDF.pdf)

Transforming...
août 07, 2017 11:26:49 AM org.apache.fop.events.LoggingEventListener processEvent
INFOS: Rendered page #1.
org.apache.fop.pdf.PDFConformanceException: For PDF/A-1b, all fonts, even the base 14 fonts, have to be embedded! Offending font: /Helvetica
    at org.apache.fop.pdf.PDFFont.validate(PDFFont.java:170)
    at org.apache.fop.pdf.PDFFont.output(PDFFont.java:179)
    at org.apache.fop.pdf.PDFDocument.outputIndirectObject(PDFDocument.java:1053)
    at org.apache.fop.pdf.PDFDocument.streamIndirectObject(PDFDocument.java:1018)
    at org.apache.fop.pdf.PDFDocument.output(PDFDocument.java:994)
    at org.apache.fop.pdf.PDFDocument.outputTrailer(PDFDocument.java:1097)
    at org.apache.fop.render.pdf.PDFDocumentHandler.endDocument(PDFDocumentHandler.java:191)
    at org.apache.fop.render.intermediate.util.IFDocumentHandlerProxy.endDocument(IFDocumentHandlerProxy.java:187)
    at org.apache.fop.render.intermediate.IFRenderer.stopRenderer(IFRenderer.java:295)
    at org.apache.fop.area.RenderPagesModel.endDocument(RenderPagesModel.java:265)
    at org.apache.fop.area.AreaTreeHandler.endDocument(AreaTreeHandler.java:342)
    at org.apache.fop.fo.FOTreeBuilder.endDocument(FOTreeBuilder.java:170)
    at org.apache.xalan.transformer.TransformerIdentityImpl.endDocument(TransformerIdentityImpl.java:963)
    at org.apache.xerces.parsers.AbstractSAXParser.endDocument(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentScannerImpl.endEntity(Unknown Source)
    at org.apache.xerces.impl.XMLEntityManager.endEntity(Unknown Source)
    at org.apache.xerces.impl.XMLEntityScanner.load(Unknown Source)
    at org.apache.xerces.impl.XMLEntityScanner.skipSpaces(Unknown Source)
    at org.apache.xerces.impl.XMLDocumentScannerImpl$TrailingMiscDispatcher.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(TransformerIdentityImpl.java:485)
    at ConverterFO2PDFa.convertFO2PDF(ConverterFO2PDFa.java:104)
    at ConverterFO2PDFa.main(ConverterFO2PDFa.java:154)

Answer 1

I was able to create a PDF/A output using the same example files after a few changes:

1. in the input FO file , I explicitly added font-family="Helvetica" (or your favourite font family) in a position where it effected all the text

   Without this, even if FOP defaults to using Helvetica when no font-family is set, it apparently is not able to find a configuration for it.

2. in the configuration file , I mapped the Helvetica font family to an existing font, for example Arial

    <font kerning="yes" embed-url="/Library/Fonts/arial.ttf"> <font-triplet name="Helvetica" style="normal" weight="normal"/> </font> 

3. in the Java code , I configured FOP to use my configuration file, and the user agent to enable accessibility

    import org.apache.avalon.framework.configuration.Configuration; import org.apache.avalon.framework.configuration.DefaultConfigurationBuilder; import org.apache.fop.apps.FopFactoryBuilder; ... DefaultConfigurationBuilder cfgBuilder = new DefaultConfigurationBuilder(); Configuration cfg = cfgBuilder.buildFromFile(new File("/Users/lfurini/fop.xconf")); FopFactoryBuilder fopFactoryBuilder = new FopFactoryBuilder(new File(".").toURI()).setConfiguration(cfg); FopFactory fopFactory = fopFactoryBuilder.build(); FOUserAgent foUserAgent = fopFactory.newFOUserAgent(); // configure foUserAgent as desired foUserAgent.setAccessibility(true); foUserAgent.getRendererOptions().put("pdf-a-mode", "PDF/A-1b"); ...