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Posted to dev@jena.apache.org by "Andy Seaborne (Jira)" <ji...@apache.org> on 2022/02/18 10:32:00 UTC
[jira] [Commented] (JENA-2285) Java Heap error when there is an optional in service block
[ https://issues.apache.org/jira/browse/JENA-2285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17494514#comment-17494514 ]
Andy Seaborne commented on JENA-2285:
-------------------------------------
Hi [~dz2002], thank you for a minimal example.
Try putting the BIND statements inside the SERVICE call. They are not being passed to the WikiData SPARQL endpoint.
Optimization around SERVICE is very cautious (i.e. very little is done) because ARQ does know what the other end is capable of. That does mean that the query writer has be involved.
> Java Heap error when there is an optional in service block
> ----------------------------------------------------------
>
> Key: JENA-2285
> URL: https://issues.apache.org/jira/browse/JENA-2285
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: Jena 4.4.0
> Reporter: Dmitry Zhelobanov
> Priority: Major
>
> Here is the query:
> {code:java}
> PREFIX owl: <http://www.w3.org/2002/07/owl#>
> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>
> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
> PREFIX wdt: <http://www.wikidata.org/prop/direct/>
> PREFIX p: <http://www.wikidata.org/prop/>
> PREFIX pq: <http://www.wikidata.org/prop/qualifier/>
> PREFIX ps: <http://www.wikidata.org/prop/statement/>
> PREFIX psv: <http://www.wikidata.org/prop/statement/value/>
> PREFIX wikibase: <http://wikiba.se/ontology#>
> SELECT ?wikidata_city_iri ?website
> WHERE {
> BIND(IRI("http://www.wikidata.org/entity/Q15757") as ?id)
> BIND(IRI(?id) AS ?wikidata_city_iri) .
> SERVICE <https://query.wikidata.org/sparql> {
> #Querying website
> OPTIONAL {
> ?wikidata_city_iri wdt:P856 ?website.
> } .
> }.
> } {code}
> When the query is executed I get"Java Heap Error" after, as I guess, Java runs out of memory in the pool. The trace of the error is below.
> When OPTIONAL is commented out, then I get "no data" as expected.
> {code:java}
> 09:16:08 INFO Fuseki :: [5] POST http://127.0.0.1:3030/WattTour/sparql
> 09:16:08 INFO Fuseki :: [5] Query = PREFIX owl: <http://www.w3.org/2002/07/owl#> PREFIX rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX wdt: <http://www.wikidata.org/prop/direct/> PREFIX p: <http://www.wikidata.org/prop/> PREFIX pq: <http://www.wikidata.org/prop/qualifier/> PREFIX ps: <http://www.wikidata.org/prop/statement/> PREFIX psv: <http://www.wikidata.org/prop/statement/value/> PREFIX wikibase: <http://wikiba.se/ontology#> SELECT ?wikidata_city_iri ?website WHERE { BIND(IRI("http://www.wikidata.org/entity/Q15757") as ?id) BIND(IRI(?id) AS ?wikidata_city_iri) . SERVICE <https://query.wikidata.org/sparql> { #Querying website OPTIONAL { ?wikidata_city_iri wdt:P856 ?website. } . }. }
> 09:18:43 WARN HttpChannel :: /$/ping
> javax.servlet.ServletException: Filtered request failed.
> at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:384) ~[fuseki-server.jar:4.4.0]
> at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:202) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594) ~[fuseki-server.jar:4.4.0]
> at org.apache.jena.fuseki.servlets.CrossOriginFilter.handle(CrossOriginFilter.java:284) ~[fuseki-server.jar:4.4.0]
> at org.apache.jena.fuseki.servlets.CrossOriginFilter.doFilter(CrossOriginFilter.java:247) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.servlet.FilterHolder.doFilter(FilterHolder.java:210) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.servlet.ServletHandler$Chain.doFilter(ServletHandler.java:1594) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:506) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:131) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:578) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:223) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1571) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:221) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1378) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:176) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:463) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1544) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:174) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1300) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:129) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.gzip.GzipHandler.handle(GzipHandler.java:711) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:122) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.Server.handle(Server.java:562) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.HttpChannel.lambda$handle$0(HttpChannel.java:418) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:675) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:410) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:282) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:319) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:100) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.io.SocketChannelEndPoint$1.run(SocketChannelEndPoint.java:101) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.runTask(AdaptiveExecutionStrategy.java:412) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.consumeTask(AdaptiveExecutionStrategy.java:381) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.tryProduce(AdaptiveExecutionStrategy.java:268) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.strategy.AdaptiveExecutionStrategy.lambda$new$0(AdaptiveExecutionStrategy.java:138) ~[fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:407) [fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:894) [fuseki-server.jar:4.4.0]
> at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:1038) [fuseki-server.jar:4.4.0]
> at java.lang.Thread.run(Thread.java:829) [?:?]
> Caused by: java.lang.OutOfMemoryError: Java heap space
> 09:18:43 WARN Fuseki :: [5] RC = 500 : Java heap space
> java.lang.OutOfMemoryError: Java heap space
> 09:18:43 INFO Fuseki :: [5] 500 Server Error (154,663 s){code}
>
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