[CLEREZZA-795] Exception sending a query to the sparql endpoint while adding data to a graph

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 0.2-incubating
• Component/s: rdf.core
• Labels: concurrentmodificationexception endpoint sparql
• Environment: Linux OS, Apache Stanbol
• Assignee: Reto Gmür
• Reporter: Luigi Selmi
• Created: 03/Jul/13 09:30
• Updated: 18/Jan/14 14:17
• Resolved: 18/Jan/14 14:17

Description

Sending a query to the Stanbol sparql endpoint based on Clerezza while adding triples to that same graph results in the following exception

java.util.ConcurrentModificationException
at com.hp.hpl.jena.tdb.store.GraphTDBBase$MapperIteratorTriples.checkCourrentModification(GraphTDBBase.java:208)
at com.hp.hpl.jena.tdb.store.GraphTDBBase$MapperIteratorTriples.hasNext(GraphTDBBase.java:216)
at org.apache.clerezza.rdf.jena.storage.JenaGraphAdaptor$1.hasNext(JenaGraphAdaptor.java:106)
at org.apache.clerezza.rdf.core.impl.AbstractTripleCollection$1.hasNext(AbstractTripleCollection.java:78)
at org.apache.clerezza.rdf.core.access.LockingIterator.hasNext(LockingIterator.java:47)
at org.apache.clerezza.rdf.jena.facade.JenaGraph$1.hasNext(JenaGraph.java:95)
at com.hp.hpl.jena.util.iterator.WrappedIterator.hasNext(WrappedIterator.java:64)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterTriplePattern$TripleMapper.hasNextBinding(QueryIterTriplePattern.java:132)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterRepeatApply.hasNextBinding(QueryIterRepeatApply.java:57)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterBlockTriples.hasNextBinding(QueryIterBlockTriples.java:53)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterConvert.hasNextBinding(QueryIterConvert.java:49)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterDistinctReduced.hasNextBinding(QueryIterDistinctReduced.java:36)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIterSlice.hasNextBinding(QueryIterSlice.java:64)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:28)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorWrapper.hasNextBinding(QueryIteratorWrapper.java:28)
at com.hp.hpl.jena.sparql.engine.iterator.QueryIteratorBase.hasNext(QueryIteratorBase.java:66)
at com.hp.hpl.jena.sparql.engine.ResultSetStream.hasNext(ResultSetStream.java:57)
at org.apache.clerezza.rdf.jena.sparql.ResultSetWrapper.<init>(ResultSetWrapper.java:39)
at org.apache.clerezza.rdf.jena.sparql.JenaSparqlEngine.execute(JenaSparqlEngine.java:68)
at org.apache.clerezza.rdf.core.access.TcManager.executeSparqlQuery(TcManager.java:272)
at org.apache.clerezza.rdf.web.core.SparqlEndpoint.runFormQuery(SparqlEndpoint.java:186)

Issue Links

• duplicates: CLEREZZA-252 read-locks by sparql engine