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https://issues.apache.org/jira/browse/JENA-2285?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17495013#comment-17495013
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Dmitry Zhelobanov commented on JENA-2285:
-----------------------------------------
[~andy] , BTW, how can we see the requests made to external services by a
federated query? I want to see exactly what request Jena makes when it
encounters SERVICE block. I tried to search it up on the web but no luck....
> 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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