Federated query

Support
1

Hello,
I am trying to run the following federated queries to access lei.info via stardog studio

PREFIX voc: <http://lei.info/voc/l1/>

SELECT *
WHERE {
    SERVICE <https://lei.info/sparql> {
    GRAPH ?g {
        ?s a voc:LegalEntity .
    }
}
}
LIMIT 100

Got errors:

{
  "message": "Network is unreachable (connect failed)"
  "code": "QueryEval"
}

However, I am able to connect using Python Sparql-client and retrieve data in the same machine.

Stardog is running behind a proxy. We have setup using -Dhttp.proxyHost -Dhttp.proxyPort. We are able to connect dbpedia via stardog studio.

Stardog server:7.0.1

2

Is there any additional information in stardog.log?

3

here is extraction from the log:
ERROR 2019-11-27 15:59:56,790 [stardog-user-1] com.complexible.stardog.protocols.http.server.StardogHttpServiceLoader:accept(231): An unexpected exception was handled by the server
com.stardog.stark.query.QueryExecutionFailure: Network is unreachable (connect failed)
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:82) ~[stardog-utils-rdf-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.TransactionManagedQueryResult.hasNext(TransactionManagedQueryResult.java:61) ~[stardog-7.0.1.jar:?]
at com.stardog.stark.query.ClosingSpliterator.forEachRemaining(ClosingSpliterator.java:37) ~[stardog-stark-query-api-7.0.1.jar:?]
at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:647) ~[?:1.8.0_222]
at com.stardog.stark.query.io.QueryResultWriters.write(QueryResultWriters.java:142) ~[stardog-stark-query-io-7.0.1.jar:?]
at com.stardog.stark.query.io.QueryResultWriters.write(QueryResultWriters.java:127) ~[stardog-stark-query-io-7.0.1.jar:?]
at com.complexible.stardog.protocols.http.server.ProtocolUtils.writeTupleResponse(ProtocolUtils.java:570) ~[stardog-protocols-http-server-7.0.1.jar:?]
at com.complexible.stardog.protocols.http.server.ProtocolUtils.executeReadQuery(ProtocolUtils.java:480) ~[stardog-protocols-http-server-7.0.1.jar:?]
at com.complexible.stardog.protocols.http.server.ProtocolUtils.executeReadQuery(ProtocolUtils.java:464) ~[stardog-protocols-http-server-7.0.1.jar:?]
at com.complexible.stardog.protocols.http.server.SPARQLProtocol.executeQuery(SPARQLProtocol.java:127) ~[stardog-protocols-http-server-7.0.1.jar:?]
at com.complexible.stardog.protocols.http.server.SPARQLProtocol.post(SPARQLProtocol.java:92) ~[stardog-protocols-http-server-7.0.1.jar:?]
at com.stardog.http.server.undertow.jaxrs.ExtractRoutes.lambda$handleIt$5(ExtractRoutes.java:192) ~[stardog-protocols-http-server-7.0.1.jar:?]
at org.apache.shiro.subject.support.SubjectRunnable.doRun(SubjectRunnable.java:120) [shiro-core-1.3.0.jar:1.3.0]
at org.apache.shiro.subject.support.SubjectRunnable.run(SubjectRunnable.java:108) [shiro-core-1.3.0.jar:1.3.0]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_222]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_222]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_222]
Caused by: com.complexible.stardog.plan.eval.operator.OperatorException: Network is unreachable (connect failed)
at com.complexible.stardog.plan.eval.service.SPARQLService$SparqlServiceQuery.evaluateBatch(SPARQLService.java:138) ~[stardog-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.service.BatchingJoinArgServiceQuery.evaluate(BatchingJoinArgServiceQuery.java:59) ~[stardog-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:82) ~[stardog-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.ServiceOperatorImpl.computeNext(ServiceOperatorImpl.java:33) ~[stardog-7.0.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:147) ~[stardog-utils-common-7.0.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:134) ~[stardog-utils-common-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:82) ~[stardog-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.impl.SingleProjectionOp.computeNext(SingleProjectionOp.java:29) ~[stardog-7.0.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:147) ~[stardog-utils-common-7.0.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:134) ~[stardog-utils-common-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:114) ~[stardog-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.AutoCloseOperator.computeNext(AutoCloseOperator.java:26) ~[stardog-7.0.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.tryToComputeNext(AbstractSkippingIterator.java:147) ~[stardog-utils-common-7.0.1.jar:?]
at com.complexible.common.collect.AbstractSkippingIterator.hasNext(AbstractSkippingIterator.java:134) ~[stardog-utils-common-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:119) ~[stardog-7.0.1.jar:?]
at com.complexible.stardog.plan.eval.operator.util.OpBasedBindingSetIteration.computeNext(OpBasedBindingSetIteration.java:40) ~[stardog-7.0.1.jar:?]
at com.google.common.collect.AbstractIterator.tryToComputeNext(AbstractIterator.java:141) ~[guava-26.0-jre.jar:?]
at com.google.common.collect.AbstractIterator.hasNext(AbstractIterator.java:136) ~[guava-26.0-jre.jar:?]
at com.complexible.common.rdf.query.IteratorAsTupleQueryResult.hasNext(IteratorAsTupleQueryResult.java:78) ~[stardog-utils-rdf-7.0.1.jar:?]
... 16 more

4

Please use the HTTPS proxy settings as described in section 2.2 of Java Networking and Proxies.

5

Hi Jess, i do have proxy setting for STARDOG_JAVA_ARGS

-Dhttp.proxyHost=xxxx -Dhttp.proxyPort=xxxx

6

The endpoint us using https

7

thanks!
I did not notice that there is Dhttps.proxyHost setting. it works now.

8

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