william-vw opened a new issue, #2733:
URL: https://github.com/apache/jena/issues/2733
### Version
5.1.0
### What happened?
Reading rdf-star code into a `Model` and subsequently writing it to an
output stream using the default format (`RDF/XML`) causes an error. It does not
cause an error when writing to `TURTLE` or `N-TRIPLES`.
### Relevant output and stacktrace
```shell
Code:
Model m = ModelFactory.createDefaultModel();
String rdf =
"@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .\n"
+ "@prefix dc: <http://purl.org/dc/terms/> .\n"
+ "@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .\n"
+ "@prefix : <http://example.com/> .\n"
+ "\n"
+ "<p1> a :Person ;\n"
+ ":birthDate \"1901\" {| :source <wikidata/p1> |} .";
m.read(new ByteArrayInputStream(rdf.getBytes()), "http://example.com/";,
"TTL");
// m.write(System.out, "N-TRIPLES");
m.write(System.out);
```
Stack trace:
```
Exception in thread "main" java.lang.NullPointerException: Cannot invoke
"String.length()" because "uri" is null
at org.apache.jena.util.SplitIRI.splitNamespaceXML10(SplitIRI.java:477)
at org.apache.jena.util.SplitIRI.splitXML10(SplitIRI.java:286)
at
org.apache.jena.rdfxml.xmloutput.impl.SplitRDFXML.splitXML10(SplitRDFXML.java:36)
at
org.apache.jena.rdfxml.xmloutput.impl.Unparser.getXMLNameSpace(Unparser.java:1183)
at
org.apache.jena.rdfxml.xmloutput.impl.Unparser.isLocalReference(Unparser.java:1200)
at
org.apache.jena.rdfxml.xmloutput.impl.Unparser.hasProperties(Unparser.java:1279)
at
org.apache.jena.util.iterator.FilterIterator.hasNext(FilterIterator.java:57)
at
org.apache.jena.rdfxml.xmloutput.impl.Unparser.wObjStar(Unparser.java:354)
at
org.apache.jena.rdfxml.xmloutput.impl.Unparser.wRDF(Unparser.java:340)
at
org.apache.jena.rdfxml.xmloutput.impl.Unparser.write(Unparser.java:244)
at
org.apache.jena.rdfxml.xmloutput.impl.RDFXML_Abbrev.writeBody(RDFXML_Abbrev.java:127)
at
org.apache.jena.rdfxml.xmloutput.impl.BaseXMLWriter.writeXMLBody(BaseXMLWriter.java:471)
at
org.apache.jena.rdfxml.xmloutput.impl.BaseXMLWriter.write(BaseXMLWriter.java:447)
at
org.apache.jena.rdfxml.xmloutput.impl.BaseXMLWriter.write(BaseXMLWriter.java:434)
at
org.apache.jena.riot.adapters.AdapterRDFWriter.write(AdapterRDFWriter.java:64)
at org.apache.jena.riot.RDFWriter.write$(RDFWriter.java:256)
at org.apache.jena.riot.RDFWriter.output(RDFWriter.java:215)
at org.apache.jena.riot.RDFWriter.output(RDFWriter.java:158)
at
org.apache.jena.riot.RDFWriterBuilder.output(RDFWriterBuilder.java:207)
at
org.apache.jena.riot.adapters.RDFWriterRIOT.write(RDFWriterRIOT.java:87)
at org.apache.jena.rdf.model.impl.ModelCom.write(ModelCom.java:243)
at Main.main(Main.java:27)
```
```
### Are you interested in making a pull request?
None
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