[jira] [Created] (JENA-824) Concurrent usage of query causes NPE

[Kristian Rosenvold (JIRA)]

Kristian Rosenvold created JENA-824:
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             Summary: 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


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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