[PDFBOX-5835] DomXmpParser - IllegalArgumentException: prefix cannot be "null" when creating a QName

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.0.31, 3.0.2 PDFBox
• Fix Version/s: 2.0.32, 3.0.3 PDFBox, 4.0.0
• Component/s: XmpBox
• Assignee: Tilman Hausherr
• Reporter: Oliver Schmidtmer
• Created: 10/Jun/24 17:34
• Updated: 24/Jul/24 16:02
• Resolved: 14/Jun/24 15:00

Description

I've got a PDF from, where parsing the metadata fails with an IllegalArgumentException

java.lang.IllegalArgumentException: prefix cannot be "null" when creating a QName
	at java.xml/javax.xml.namespace.QName.<init>(QName.java:192)
	at org.apache.xmpbox.xml.DomHelper.getQName(DomHelper.java:99)
	at org.apache.xmpbox.xml.DomXmpParser.parseChildrenAsProperties(DomXmpParser.java:306)
	at org.apache.xmpbox.xml.DomXmpParser.parseDescriptionRoot(DomXmpParser.java:250)
	at org.apache.xmpbox.xml.DomXmpParser.parse(DomXmpParser.java:201)
	at org.apache.xmpbox.xml.DomXmpParser.parse(DomXmpParser.java:112)

This can be reproduced with a simple test, using the extracted metadata:

    @Test
    void testDomXmpParser() throws XmpParsingException
    {
        // taken from file test-landscape2.pdf
        String xmpmeta = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n" +
                "<?xpacket begin=\"\uFEFF\" id=\"W5M0MpCehiHzreSzNTczkc9d\"?><x:xmpmeta xmlns:x=\"adobe:ns:meta/\" x:xmptk=\"FIS/xee\">\n" +
                " <rdf:RDF xmlns:rdf=\"http://www.w3.org/1999/02/22-rdf-syntax-ns#\">\n" +
                " <rdf:Description xmlns:pdfaid=\"http://www.aiim.org/pdfa/ns/id/\">\n" +
                "   <pdfaid:part>3</pdfaid:part>\n" +
                "   <pdfaid:conformance>A</pdfaid:conformance>\n" +
                "  </rdf:Description>\n" +
                "  <rdf:Description xmlns:pdfaExtension=\"http://www.aiim.org/pdfa/ns/extension/\" xmlns:pdfaField=\"http://www.aiim.org/pdfa/ns/field#\" xmlns:pdfaProperty=\"http://www.aiim.org/pdfa/ns/property#\" xmlns:pdfaSchema=\"http://www.aiim.org/pdfa/ns/schema#\" xmlns:pdfaType=\"http://www.aiim.org/pdfa/ns/type#\" rdf:about=\"\"/>\n" +
                "  <rdf:Description>\n" +
                "   <schemas xmlns=\"http://www.aiim.org/pdfa/ns/extension/\">\n" +
                "    <rdf:Bag>\n" +
                "     <rdf:li rdf:parseType=\"Resource\">\n" +
                "      <schema xmlns=\"http://www.aiim.org/pdfa/ns/schema#\">ZUGFeRD PDFA Extension Schema</schema>\n" +
                "      <namespaceURI xmlns=\"http://www.aiim.org/pdfa/ns/schema#\">urn:ferd:pdfa:CrossIndustryDocument:invoice:1p0#</namespaceURI>\n" +
                "      <prefix xmlns=\"http://www.aiim.org/pdfa/ns/schema#\">zf</prefix>\n" +
                "      <property xmlns=\"http://www.aiim.org/pdfa/ns/schema#\">\n" +
                "       <rdf:Seq>\n" +
                "        <rdf:li rdf:parseType=\"Resource\">\n" +
                "         <name xmlns=\"http://www.aiim.org/pdfa/ns/property#\">DocumentFileName</name>\n" +
                "         <valueType xmlns=\"http://www.aiim.org/pdfa/ns/property#\">Text</valueType>\n" +
                "         <category xmlns=\"http://www.aiim.org/pdfa/ns/property#\">external</category>\n" +
                "         <description xmlns=\"http://www.aiim.org/pdfa/ns/property#\">name of the embedded XML invoice file</description>\n" +
                "        </rdf:li>\n" +
                "        <rdf:li rdf:parseType=\"Resource\">\n" +
                "         <name xmlns=\"http://www.aiim.org/pdfa/ns/property#\">DocumentType</name>\n" +
                "         <valueType xmlns=\"http://www.aiim.org/pdfa/ns/property#\">Text</valueType>\n" +
                "         <category xmlns=\"http://www.aiim.org/pdfa/ns/property#\">external</category>\n" +
                "         <description xmlns=\"http://www.aiim.org/pdfa/ns/property#\">INVOICE</description>\n" +
                "        </rdf:li>\n" +
                "        <rdf:li rdf:parseType=\"Resource\">\n" +
                "         <name xmlns=\"http://www.aiim.org/pdfa/ns/property#\">Version</name>\n" +
                "         <valueType xmlns=\"http://www.aiim.org/pdfa/ns/property#\">Text</valueType>\n" +
                "         <category xmlns=\"http://www.aiim.org/pdfa/ns/property#\">external</category>\n" +
                "         <description xmlns=\"http://www.aiim.org/pdfa/ns/property#\">The actual version of the ZUGFeRD data</description>\n" +
                "        </rdf:li>\n" +
                "        <rdf:li rdf:parseType=\"Resource\">\n" +
                "         <name xmlns=\"http://www.aiim.org/pdfa/ns/property#\">ConformanceLevel</name>\n" +
                "         <valueType xmlns=\"http://www.aiim.org/pdfa/ns/property#\">Text</valueType>\n" +
                "         <category xmlns=\"http://www.aiim.org/pdfa/ns/property#\">external</category>\n" +
                "         <description xmlns=\"http://www.aiim.org/pdfa/ns/property#\">The conformance level of the ZUGFeRD data</description>\n" +
                "        </rdf:li>\n" +
                "       </rdf:Seq>\n" +
                "      </property>\n" +
                "     </rdf:li>\n" +
                "    </rdf:Bag>\n" +
                "   </schemas>\n" +
                "  </rdf:Description>\n" +
                "  <rdf:Description xmlns:zf=\"urn:ferd:pdfa:CrossIndustryDocument:invoice:1p0#\" rdf:about=\"\" zf:ConformanceLevel=\"EXTENDED\" zf:DocumentFileName=\"ZUGFeRD-invoice.xml\" zf:DocumentType=\"INVOICE\" zf:Version=\"1.0\"/>\n" +
                " </rdf:RDF>\n" +
                "</x:xmpmeta><?xpacket end=\"w\"?>\n";
        DomXmpParser xmpParser = new DomXmpParser();
        xmpParser.setStrictParsing(false);
        XMPMetadata xmp = xmpParser.parse(xmpmeta.getBytes());
    }