Hi, Andy, thank you very much for your answer, which helped to open my eyes. The problem is completely in the calling code, nothing wrong with the writer. Sorry for this false alert.
fps > Le 6 nov. 2016 à 10:42, Andy Seaborne <[email protected]> a écrit : > > Hi there, > > In TDB1, a write transaction has a separate internal dataset object, whereas > readers of the same committed state (epoch) share an internal dataset which > is read-only. > > The DatasetControlMRSW applies to each internal dataset. > > The trigger you have come across is checking that the epoch the iterator > started with is the same as it is currently when hasNext is called. It has > found that the epoch has advanced. > > This can occur if > > 1/ multiple threads, not in a transaction, and there is an update somewhere. > > 2/ There is an update on the dataset inside an iterator loop. That does not > seem to be possible here as its an iterator inside the JSON-LD writer. > > 3/ if there multiple threads are acting on same transaction; you need to > handle the Transaction object directly to cause this. > > The problem is not at the point the stacktrace records - that only gives when > it was detected. > > > Andy > > > On 06/11/16 00:41, François-Paul Servant wrote: >> Hi, >> >> I've just got a ConcurrentModificationException outputing jsonld, in the >> following circumstance: trying to output the content of a given named graph >> of a TDB store, twice at the same time (output called from a jersey servlet). >> The problem exists in 3.1.1 and 3.1.0. Stacktraces below. >> I don’t understand. Sorry to see this only now. >> >> fps >> >> >> StackTrace with 3.1.0: >> GRAVE: Servlet.service() for servlet [Jersey Web Application] in context >> with path [/rasse] threw exception >> [java.util.ConcurrentModificationException: Iterator: started at 205, now >> 206] with root cause >> java.util.ConcurrentModificationException: Iterator: started at 205, now 206 >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW.policyError(DatasetControlMRSW.java:157) >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW.access$000(DatasetControlMRSW.java:32) >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.checkCourrentModification(DatasetControlMRSW.java:110) >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.hasNext(DatasetControlMRSW.java:118) >> at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265) >> at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265) >> at org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:870) >> at >> org.apache.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90) >> at org.apache.jena.atlas.iterator.Iter.apply(Iter.java:172) >> at org.apache.jena.atlas.iterator.Iter.apply(Iter.java:781) >> at >> org.apache.jena.riot.out.JsonLDWriter.addProperties(JsonLDWriter.java:172) >> at org.apache.jena.riot.out.JsonLDWriter.serialize(JsonLDWriter.java:84) >> at org.apache.jena.riot.out.JsonLDWriter.write(JsonLDWriter.java:68) >> at org.apache.jena.riot.out.JsonLDWriter.write(JsonLDWriter.java:78) >> at >> org.apache.jena.riot.system.RiotLib$WriterAdapter.write(RiotLib.java:376) >> at >> org.apache.jena.riot.adapters.RDFWriterRIOT.write(RDFWriterRIOT.java:82) >> at org.apache.jena.rdf.model.impl.ModelCom.write(ModelCom.java:355) >> at >> com.renault.rasse.resources.AbstractRasseResource.writeModelConvertingEuro5Uris2RasseOnes(AbstractRasseResource.java:736) >> at >> com.renault.rasse.resources.AbstractRasseResource$1.write(AbstractRasseResource.java:624) >> at >> org.glassfish.jersey.message.internal.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:78) >> at >> org.glassfish.jersey.message.internal.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:60) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.invokeWriteTo(WriterInterceptorExecutor.java:265) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:250) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:106) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.server.mvc.internal.TemplateMethodInterceptor.aroundWriteTo(TemplateMethodInterceptor.java:77) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:86) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130) >> at >> org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:711) >> at >> org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:444) >> at >> org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:434) >> at >> org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:329) >> at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) >> at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) >> at org.glassfish.jersey.internal.Errors.process(Errors.java:315) >> at org.glassfish.jersey.internal.Errors.process(Errors.java:297) >> at org.glassfish.jersey.internal.Errors.process(Errors.java:267) >> at >> org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) >> at >> org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) >> at >> org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) >> at >> org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) >> at >> org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) >> at >> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) >> at >> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) >> at >> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) >> at >> org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) >> at >> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) >> at >> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) >> at >> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506) >> at >> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) >> at >> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) >> at >> org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) >> at >> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) >> at >> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) >> at >> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081) >> at >> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) >> at >> org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) >> at >> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566) >> at >> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523) >> at >> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) >> at >> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) >> at >> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) >> at java.lang.Thread.run(Thread.java:745) >> >> with 3.1.1 >> GRAVE: Servlet.service() for servlet [Jersey Web Application] in context >> with path [/rasse] threw exception >> [java.util.ConcurrentModificationException: Iterator: started at 25, now 26] >> with root cause >> java.util.ConcurrentModificationException: Iterator: started at 25, now 26 >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW.policyError(DatasetControlMRSW.java:157) >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW.access$000(DatasetControlMRSW.java:32) >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.checkCourrentModification(DatasetControlMRSW.java:110) >> at >> org.apache.jena.tdb.sys.DatasetControlMRSW$IteratorCheckNotConcurrent.hasNext(DatasetControlMRSW.java:118) >> at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265) >> at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265) >> at org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:870) >> at >> org.apache.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:90) >> at org.apache.jena.atlas.iterator.Iter$2.hasNext(Iter.java:265) >> at org.apache.jena.atlas.iterator.Iter.hasNext(Iter.java:870) >> at >> org.apache.jena.riot.writer.JenaRDF2JSONLD.parse(JenaRDF2JSONLD.java:47) >> at >> org.apache.jena.riot.writer.JsonLDWriter.serialize(JsonLDWriter.java:183) >> at org.apache.jena.riot.writer.JsonLDWriter.write(JsonLDWriter.java:136) >> at org.apache.jena.riot.writer.JsonLDWriter.write(JsonLDWriter.java:142) >> at >> org.apache.jena.riot.system.RiotLib$WriterAdapter.write(RiotLib.java:376) >> at >> org.apache.jena.riot.adapters.RDFWriterRIOT.write(RDFWriterRIOT.java:82) >> at org.apache.jena.rdf.model.impl.ModelCom.write(ModelCom.java:357) >> at >> com.renault.rasse.resources.AbstractRasseResource.writeModelConvertingEuro5Uris2RasseOnes(AbstractRasseResource.java:736) >> at >> com.renault.rasse.resources.AbstractRasseResource$1.write(AbstractRasseResource.java:624) >> at >> org.glassfish.jersey.message.internal.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:78) >> at >> org.glassfish.jersey.message.internal.StreamingOutputProvider.writeTo(StreamingOutputProvider.java:60) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.invokeWriteTo(WriterInterceptorExecutor.java:265) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:250) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:106) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.server.mvc.internal.TemplateMethodInterceptor.aroundWriteTo(TemplateMethodInterceptor.java:77) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:86) >> at >> org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162) >> at >> org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1130) >> at >> org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:711) >> at >> org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:444) >> at >> org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:434) >> at >> org.glassfish.jersey.server.ServerRuntime$2.run(ServerRuntime.java:329) >> at org.glassfish.jersey.internal.Errors$1.call(Errors.java:271) >> at org.glassfish.jersey.internal.Errors$1.call(Errors.java:267) >> at org.glassfish.jersey.internal.Errors.process(Errors.java:315) >> at org.glassfish.jersey.internal.Errors.process(Errors.java:297) >> at org.glassfish.jersey.internal.Errors.process(Errors.java:267) >> at >> org.glassfish.jersey.process.internal.RequestScope.runInScope(RequestScope.java:317) >> at >> org.glassfish.jersey.server.ServerRuntime.process(ServerRuntime.java:305) >> at >> org.glassfish.jersey.server.ApplicationHandler.handle(ApplicationHandler.java:1154) >> at >> org.glassfish.jersey.servlet.WebComponent.serviceImpl(WebComponent.java:473) >> at >> org.glassfish.jersey.servlet.WebComponent.service(WebComponent.java:427) >> at >> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:388) >> at >> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:341) >> at >> org.glassfish.jersey.servlet.ServletContainer.service(ServletContainer.java:228) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) >> at >> org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) >> at >> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) >> at >> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) >> at >> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) >> at >> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) >> at >> org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506) >> at >> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) >> at >> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) >> at >> org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) >> at >> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) >> at >> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:537) >> at >> org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1081) >> at >> org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:658) >> at >> org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:222) >> at >> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1566) >> at >> org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1523) >> at >> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) >> at >> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) >> at >> org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) >> at java.lang.Thread.run(Thread.java:745) >> >> >>
