Could there be not non-String-Readers coming from more character-set-correct environments beyond files and network streams? E.g. databases or other libraries? Readers allow the string provider to also do streaming from the source, like we do internally within Riot of the statements.
On 15 November 2013 09:01, Andy Seaborne <[email protected]> wrote: > On 15/11/13 05:59, Phillip Rhodes wrote: >> >> FWIW... I just grabbed the Jena source, imported it into my workspace >> and set my project to reference that, so I could debug into this as >> it's running. What I see is the code getting to line 864 in RDFDataMgr >> and executing this code: >> >> parser = RiotReader.createParser(tokenizer, lang, base, output) ; >> >> which returns null. The next line tries to use the null reference, >> and hence the NPE. >> >> Looking at RiotReader.createParser(), I don't see anything in there >> that mentions JSON-LD at all. But the docs for java-jsonld say >> something like: >> >> "JenaJSONLD must be initialized so that the readers and writers are >> registered with Jena." and I do call the init() method. But I don't >> see how that registration process plays with this createParser() code. >> >> I'm guessing things have just gotten out of sync between Jena and the >> JSON-LD stuff? > > > The problem is reading from a reader (I should have noticed this earlier in > the thread). > > If you use an InputStream it will work (= it does for me). > > Readers are troublesome because they fix the charset before Jena gets a > chance set the encodign according to syntax. A FileReader is particularly > troublesome because it fixes the charset as the system default so if that is > not UTF-8 (and it isn't on Windows) it will not be UTF-8. > > StringReader is only usecase but it currently follows a hardwired path > inside RDFDataMgr. The general ReaderRIOT interface does not have Readers. > > Regrettably, I think I'll have to go and add Readers to ReaderRIOT (it only > results in parallel code - InputStream and Reader have no commonality) just > because of StringReader. > > You should be able to pass the input stream from HTTP request to the > RDFDataMgr or model.read directly. > > Andy > >> Phil > > -- Stian Soiland-Reyes, myGrid team School of Computer Science The University of Manchester http://soiland-reyes.com/stian/work/ http://orcid.org/0000-0001-9842-9718
