The same query: PREFIX dcat: <http://www.w3.org/ns/dcat#> PREFIX data: <http://opensensingcity.emse.fr/LDPDesign/data/> PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX : <http://opensensingcity.emse.fr/LDPDesignVocabulary/> CONSTRUCT { <https://bistrotdepays.opendatasoft.com/id/theme/ Sport%2C%20Loisirs> ?p ?o . } WHERE { <https://bistrotdepays. opendatasoft.com/id/theme/Sport%2C%20Loisirs> ?p ?o . }
if %2C%20 <https://bistrotdepays.opendatasoft.com/id/theme/Sport%2C%20Loisirs> is removed from https://bistrotdepays.opendatasoft.com/id/theme/Sport%2C% 20Loisirs, it works even with the prefix unexpanded So, the query below works !!: PREFIX dcat: <http://www.w3.org/ns/dcat#> PREFIX data: <http://opensensingcity.emse.fr/LDPDesign/data/> PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX : <http://opensensingcity.emse.fr/LDPDesignVocabulary/> CONSTRUCT { <https://bistrotdepays.opendatasoft.com/id/theme/SportLoisirs <https://bistrotdepays.opendatasoft.com/id/theme/Sport%2C%20Loisirs>> ?p ?o . } WHERE { <https://bistrotdepays.opendatasoft.com/id/theme/SportLoisirs <https://bistrotdepays.opendatasoft.com/id/theme/Sport%2C%20Loisirs>> ?p ?o . } On Fri, Nov 24, 2017 at 2:02 PM, Mohammad Noorani Bakerally < noorani.bakera...@gmail.com> wrote: > A temporary solution for my problem, is that I expand the query and sends > it, it's temporary because for logs or analysis of prefixes or whatever... > it may not be the best thing to do > > Query gq = QueryFactory.create(Global.prefixes + queryStr); > gq.setPrefixMapping(Global.prefixMap); > gq.getPrologue().getPrefixMapping().clearNsPrefixMap(); > QueryExecution qe = QueryExecutionFactory.sparqlService(this.location, > gq.serialize()); > > > > > > > On Fri, Nov 24, 2017 at 11:21 AM, Mohammad Noorani Bakerally < > noorani.bakera...@gmail.com> wrote: > >> I think it's how the client is creating the request, since one client can >> send it and get a reply and another cannot send or not properly creating it >> such that low level programs cannot send the request, not sure though >> >> On 24 Nov 2017 10:58, "Andy Seaborne" <a...@apache.org> wrote: >> >>> >>> >>> On 24/11/17 09:30, Mohammad Noorani Bakerally wrote: >>> >>>> Just checked something, I've used the SPARQL Client YASGUI and the >>>> sparql >>>> query is answered properly, can we deduce that the issue is with the >>>> client >>>> ? >>>> >>> >>> That would seem most likely, something on the network path from client >>> to server - it is so hard to be definite about these low level errors. >>> >>> Andy >>> >>> >>>> >>>> >>>> >>>> >>>> On Fri, Nov 24, 2017 at 10:22 AM, Mohammad Noorani Bakerally < >>>> noorani.bakera...@gmail.com> wrote: >>>> >>>> Yes, I'm going to check the logs, but so far, a query like SELECT * >>>>> WHERE >>>>> { ?s ?p ?o .} LIMIT 10 is properly handled and results is returned, I >>>>> can >>>>> share the sparql endpoint, it is http://opensensingcity. >>>>> emse.fr/sparql/bistro, it's just for some testing purposes, so if I >>>>> understand, if a query is answered, Fuseki must be properly configured >>>>> with >>>>> apache, the resets happens immediately and there is no delay, i've not >>>>> checked the log but it seems the request doesn't even go to the server >>>>> >>>>> >>>>> >>>>> >>>>> On Fri, Nov 24, 2017 at 10:03 AM, Andy Seaborne <a...@apache.org> >>>>> wrote: >>>>> >>>>> HttpException: -1 Unexpected error making the query: >>>>>>> java.net.SocketException: Connection reset >>>>>>> >>>>>> >>>>>> This is a problem at a low level in the networking stack (fake status >>>>>> code -1 from Jena also says it's not an HTTP error). The other end >>>>>> responded with a TCP RST (the connection reset bit) which is attempt >>>>>> to use >>>>>> a connection the other end thinks is closed or does not exist. >>>>>> >>>>>> There are many reasons that can cause this - some kind of network >>>>>> environmental issue between client and server. >>>>>> >>>>>> Having a reverse proxy (RP) in front of the Fuseki server is one >>>>>> possible >>>>>> cause e.g. when Fuseki isn't there but the reverse proxy is, there >>>>>> can be a >>>>>> rejection at the TCP level. Or the RP has rebooted reboot. >>>>>> >>>>>> There are many reasons (StackOverflow has many questions about this). >>>>>> >>>>>> Check the Fuseki server log - did the query even reach the server? >>>>>> Resets >>>>>> usually happen at the start (e.g after a long period of no use and >>>>>> the RP >>>>>> has timed the connection out (Fuseki, standalone, hasn't configured to >>>>>> Jetty to do this).. >>>>>> >>>>>> If it did reach the server, then some intermediate may have forcefully >>>>>> closed the connection. >>>>>> >>>>>> Andy >>>>>> >>>>>> >>>>>> On 23/11/17 22:38, Mohammad Noorani Bakerally wrote: >>>>>> >>>>>> I am getting an exception when executing the following a valid >>>>>>> construct >>>>>>> query on Fuseki via jena. Any idea about this problem ? >>>>>>> >>>>>>> The query: >>>>>>> ============== >>>>>>> PREFIX dcat: <http://www.w3.org/ns/dcat#> >>>>>>> PREFIX data: <http://opensensingcity.emse.fr/LDPDesign/data/> >>>>>>> PREFIX skos: <http://www.w3.org/2004/02/skos/core#> >>>>>>> PREFIX : <http://opensensingcity.emse.fr/LDPDesignVocabulary/> >>>>>>> CONSTRUCT { < >>>>>>> https://bistrotdepays.opendatasoft.com/id/theme/Sport%2C%20Loisirs> >>>>>>> ?p >>>>>>> ?o . >>>>>>> } WHERE { < >>>>>>> https://bistrotdepays.opendatasoft.com/id/theme/Sport%2C%20Loisirs> >>>>>>> ?p >>>>>>> ?o . >>>>>>> } >>>>>>> >>>>>>> >>>>>>> >>>>>>> The exception: >>>>>>> ============ >>>>>>> HttpException: -1 Unexpected error making the query: >>>>>>> java.net.SocketException: Connection reset >>>>>>> >>>>>>> at org.apache.jena.sparql.engine.http.HttpQuery.rewrap(HttpQuer >>>>>>> y.java:374) >>>>>>> at org.apache.jena.sparql.engine.http.HttpQuery.execGet(HttpQue >>>>>>> ry.java:337) >>>>>>> at org.apache.jena.sparql.engine.http.HttpQuery.exec(HttpQuery. >>>>>>> java:288) >>>>>>> at >>>>>>> org.apache.jena.sparql.engine.http.QueryEngineHTTP.execConst >>>>>>> ructWorker(QueryEngineHTTP.java:465) >>>>>>> at >>>>>>> org.apache.jena.sparql.engine.http.QueryEngineHTTP.execModel >>>>>>> (QueryEngineHTTP.java:428) >>>>>>> at >>>>>>> org.apache.jena.sparql.engine.http.QueryEngineHTTP.execConst >>>>>>> ruct(QueryEngineHTTP.java:389) >>>>>>> at >>>>>>> org.apache.jena.sparql.engine.http.QueryEngineHTTP.execConst >>>>>>> ruct(QueryEngineHTTP.java:384) >>>>>>> at >>>>>>> loader.configuration.SPARQLDataSource.executeGraphQuery(SPAR >>>>>>> QLDataSource.java:43) >>>>>>> at genPLDPD.Evaluation.evalRM(Evaluation.java:136) >>>>>>> >>>>>>> >>>>>> >>>>> >>>> >
