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 <[email protected]> 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) >> >
