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[Bigdata-developers] Federated query - BLZG-1153?
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From: Joakim S. <joa...@bl...> - 2016-02-28 00:06:46
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I am trying to query combining two endpoints: PREFIX wd: <http://www.wikidata.org/entity/> SELECT ?wikiId ?wikidataItem WHERE { <http://dbpedia.org/resource/Elvis_Presley> owl:sameAs ?wikidataItem . FILTER regex(str(?wikidataItem), 'http://wikidata.org/entity/', 'i') SERVICE <http://nn.nn.nnn.1:9999/bigdata/sparql> { ?s ?p ?wikidataItem } } limit 100 But this returns an empty result, even though ?wikidataItem contains the value: <http://wikidata.org/entity/Q303> Manually replacing ?wikidataItem with wd:Q303, makes the query work: PREFIX wd: <http://www.wikidata.org/entity/> SELECT ?wikiId ?wikidataItem WHERE { <http://dbpedia.org/resource/Elvis_Presley> owl:sameAs ?wikidataItem . FILTER regex(str(?wikidataItem), 'http://wikidata.org/entity/', 'i') SERVICE <http://nn.nn.nnn.1:9999/bigdata/sparql> { ?s ?p wd:Q303} } limit 100 When I build a string from the variable I get another error: PREFIX wd: <http://www.wikidata.org/entity/> PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?wikiId ?wikidataItem WHERE { <http://dbpedia.org/resource/Elvis_Presley> owl:sameAs ?wikidataItem . FILTER regex(str(?wikidataItem), 'http://wikidata.org/entity/', 'i') BIND(REPLACE(str(?wikidataItem), '^.*(#|/)', "") AS ?localname) BIND( CONCAT( "wd:", str(?localname) ) AS ?wikiId ) SERVICE <http://nn.nn.nnn.1:9999/bigdata/sparql> { ?s ?p ?wikiId } } limit 100 prefix bds: SELECT ?s ?p ?wikiId WHERE { ?s ?p ?wikiId } java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: org.openrdf.query.QueryEvaluationException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.RuntimeException: Unknown extension: Vocab(-9) at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:192) at com.bigdata.rdf.sail.webapp.BigdataServlet.submitApiTask(BigdataServlet.java:281) at com.bigdata.rdf.sail.webapp.QueryServlet.doSparqlQuery(QueryServlet.java:636) at com.bigdata.rdf.sail.webapp.QueryServlet.doPost(QueryServlet.java:263) at com.bigdata.rdf.sail.webapp.RESTServlet.doPost(RESTServlet.java:269) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:808) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:587) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1127) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:515) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1061) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:215) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:110) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:97) at org.eclipse.jetty.server.Server.handle(Server.java:497) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:310) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:257) at org.eclipse.jetty.io.AbstractConnection$2.run(AbstractConnection.java:540) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:635) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:555) at java.lang.Thread.run(Thread.java:745) Caused by: java.util.concurrent.ExecutionException: org.openrdf.query.QueryEvaluationException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.RuntimeException: Unknown extension: Vocab(-9) at java.util.concurrent.FutureTask.report(FutureTask.java:122) at java.util.concurrent.FutureTask.get(FutureTask.java:192) at com.bigdata.rdf.sail.webapp.QueryServlet$SparqlQueryTask.call(QueryServlet.java:834) at com.bigdata.rdf.sail.webapp.QueryServlet$SparqlQueryTask.call(QueryServlet.java:653) at com.bigdata.rdf.task.ApiTaskForIndexManager.call(ApiTaskForIndexManager.java:68) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) ... 1 more Caused by: org.openrdf.query.QueryEvaluationException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.RuntimeException: Unknown extension: Vocab(-9) at com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.hasNext(Bigdata2Sesame2BindingSetIterator.java:188) at info.aduna.iteration.IterationWrapper.hasNext(IterationWrapper.java:68) at org.openrdf.query.QueryResults.report(QueryResults.java:155) at org.openrdf.repository.sail.SailTupleQuery.evaluate(SailTupleQuery.java:76) at com.bigdata.rdf.sail.webapp.BigdataRDFContext$TupleQueryTask.doQuery(BigdataRDFContext.java:1711) at com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.innerCall(BigdataRDFContext.java:1568) at com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.call(BigdataRDFContext.java:1533) at com.bigdata.rdf.sail.webapp.BigdataRDFContext$AbstractQueryTask.call(BigdataRDFContext.java:705) ... 4 more Caused by: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.RuntimeException: Unknown extension: Vocab(-9) at com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator.checkFuture(BlockingBuffer.java:1523) at com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator._hasNext(BlockingBuffer.java:1710) at com.bigdata.relation.accesspath.BlockingBuffer$BlockingIterator.hasNext(BlockingBuffer.java:1563) at com.bigdata.striterator.AbstractChunkedResolverator._hasNext(AbstractChunkedResolverator.java:365) at com.bigdata.striterator.AbstractChunkedResolverator.hasNext(AbstractChunkedResolverator.java:341) at com.bigdata.rdf.sail.Bigdata2Sesame2BindingSetIterator.hasNext(Bigdata2Sesame2BindingSetIterator.java:134) |
