Correct, I've registered only the writer but attempting to read JSON-LD. That is because content negotiation is based on RDFLanguages.getRegisteredLanguages() and therefore JSON-LD is included in Accept headers.
I guess I will need to keep track of actual readable/writable types separately in order to avoid this situation. On Tue, Dec 22, 2015 at 1:55 PM, Andy Seaborne <a...@apache.org> wrote: > On 22/12/15 12:46, Martynas Jusevičius wrote: >> >> I'm stuck with this version because the latest SPIN API (1.4.0) is >> using it and last I heard Holger said he's not planning an upgrade :/ > > > Does it matter? > 2.12.0 has JSON-LD. > >> >> I registered the writer like this: >> >> RDFLanguages.register(RDFLanguages.JSONLD); >> RDFWriterRegistry.register(new RDFFormat(RDFLanguages.JSONLD), new > > > So you have only registered the writer. > > (Why are you trying to read JSON-LD?) > >> JSONLDWriterFactory(jsonLdTemplates)); >> >> >> https://github.com/Graphity/graphity-client/blob/master/src/main/java/org/graphity/client/Application.java#L145 >> >> I can do a pre-check by attempting >> ModelFactory.createDefaultModel().getReader() and catching the >> exception. But it's not very elegant. > > > That seems to be a way of doing it. > > > Andy > > >> >> On Tue, Dec 22, 2015 at 1:35 PM, Andy Seaborne <a...@apache.org> wrote: >>> >>> Unclear. >>> >>> 1/ 2.11.0 is old. Use a later version with JSON-LD built-in. >>> >>> 2/ You may need to use RDFDataMgr. >>> >>> Not sure at 2.11.old whether Lang registration interacted with the Jena >>> RDFReaderFImpl. >>> >>> 3/ Not clear what you registered and how. >>> >>> 4/ Did you call RIOT.init()? Maybe needed. >>> >>> Andy >>> >>> >>> >>> On 21/12/15 17:25, Martynas Jusevičius wrote: >>>> >>>> >>>> Hey, >>>> >>>> I have a situation where I register a new Lang (JSON-LD) in Jena >>>> 2.11.0 but I only have a Writer for it, not a Reader. How can I check >>>> whether Reader exists for a certain Lang before doing the actual read? >>>> >>>> Right now I get an exception: >>>> >>>> com.hp.hpl.jena.shared.NoReaderForLangException: JSON-LD >>>> at >>>> >>>> com.hp.hpl.jena.rdf.model.impl.RDFReaderFImpl.getReader(RDFReaderFImpl.java:100) >>>> at com.hp.hpl.jena.rdf.model.impl.ModelCom.read(ModelCom.java:274) >>>> >>>> Thanks, >>>> >>>> Martynas >>>> >>> >
