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https://issues.apache.org/jira/browse/JENA-824?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andy Seaborne closed JENA-824.
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> Concurrent usage of query causes NPE
> ------------------------------------
>
> Key: JENA-824
> URL: https://issues.apache.org/jira/browse/JENA-824
> Project: Apache Jena
> Issue Type: Bug
> Reporter: Kristian Rosenvold
> Assignee: Andy Seaborne
> Priority: Major
> Fix For: Jena 3.15.0
>
>
> Callin gQueryFactory.parse and then handling the Query off to multiple
> threads can/will cause the error show in the stacktrace.
> As long as setResultVars is called on the Query before handing off to
> threads, it seems to be safe.
> Pull request is coming on this.
> java.lang.NullPointerException
> at com.hp.hpl.jena.sparql.core.Var.varNames(Var.java:193)
> at com.hp.hpl.jena.query.Query.getResultVars(Query.java:369)
> at
> com.hp.hpl.jena.sparql.engine.QueryExecutionBase.asResultSet(QueryExecutionBase.java:470)
> at
> com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execResultSet(QueryExecutionBase.java:533)
> at com.hp.hpl.jena.sparql.engine.QueryExecutionBase.execSelect
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