[jira] [Assigned] (JENA-1424) LOAD ... INTO GRAPH relies too much on filename extension

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-1424?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne reassigned JENA-1424:
-----------------------------------

    Assignee: Andy Seaborne

> LOAD ... INTO GRAPH relies too much on filename extension
> ---------------------------------------------------------
>
>                 Key: JENA-1424
>                 URL: https://issues.apache.org/jira/browse/JENA-1424
>             Project: Apache Jena
>          Issue Type: Bug
>    Affects Versions: Jena 3.5.0
>         Environment: Ubuntu 16.04
>            Reporter: Osma Suominen
>            Assignee: Andy Seaborne
>            Priority: Minor
>
> I tried to perform this SPARQL Update on an empty TDB:
> {noformat}
> LOAD <http://api.finto.fi/rest/v1/yso/data> INTO GRAPH <http://www.yso.fi/onto/yso/>
> {noformat}
> but got this error from tdbupdate:
> {noformat}
> $ tdbupdate --loc tdb --update=load-yso.ru 
> org.apache.jena.update.UpdateException: Attempt to load quads into a graph
>         at org.apache.jena.sparql.modify.UpdateEngineWorker.visit(UpdateEngineWorker.java:146)
>         at org.apache.jena.sparql.modify.request.UpdateLoad.visit(UpdateLoad.java:64)
>         at org.apache.jena.sparql.modify.UpdateVisitorSink.send(UpdateVisitorSink.java:46)
>         at org.apache.jena.sparql.modify.UpdateVisitorSink.send(UpdateVisitorSink.java:26)
>         at org.apache.jena.atlas.iterator.Iter.sendToSink(Iter.java:546)
>         at org.apache.jena.atlas.iterator.Iter.sendToSink(Iter.java:553)
>         at org.apache.jena.sparql.modify.UpdateProcessorBase.execute(UpdateProcessorBase.java:59)
>         at arq.update.execOneFile(update.java:105)
>         at arq.update.execUpdate(update.java:81)
>         at arq.cmdline.CmdUpdate.exec(CmdUpdate.java:63)
>         at jena.cmd.CmdMain.mainMethod(CmdMain.java:93)
>         at jena.cmd.CmdMain.mainRun(CmdMain.java:58)
>         at jena.cmd.CmdMain.mainRun(CmdMain.java:45)
>         at tdb.tdbupdate.main(tdbupdate.java:37)
> {noformat}
> So basically Jena is complaining that I'm trying to load quads into a graph. But that's not true. The URL specified in the LOAD actually performs content negotiation and then redirects (302) either to an RDF/XML or a Turtle serialization (with the proper Content-type headers), both are graphs not quads.
> The problem seems to be that UpdateEngineWorker checks the URL specified in the LOAD as if it were a filename and throws an exception if its file extension doesn't match the known graph formats. In this case there is no extension so it won't match.
> The check was introduced 6 months ago in this commit:
> https://github.com/apache/jena/commit/931a437bb49fecdb1cb70a5e6225e27141dec86c#diff-d0b3b8995c502712dac778f5bb61bc9dR146
> If I use the URL that the above URL redirects to, which contains a .ttl file extension, loading works fine:
> {noformat}
> LOAD <http://api.finto.fi/download/yso/yso-skos.ttl> INTO GRAPH <http://www.yso.fi/onto/yso/>
> {noformat}
> But this means that the LOAD ... INTO GRAPH ... command cannot be used with arbitrary Linked Data URIs, just ones that happen to contain a file extension like .ttl or .rdf or .nt.



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