[jboss-jira] [JBoss JIRA] (DROOLS-1669) NullPointerException in FlatQueryResults.<init> ("left join" query)

[Russell Morrisey (JIRA)]

Russell Morrisey created DROOLS-1669:
----------------------------------------

             Summary: NullPointerException in FlatQueryResults.<init> ("left join" query)
                 Key: DROOLS-1669
                 URL: https://issues.jboss.org/browse/DROOLS-1669
             Project: Drools
          Issue Type: Bug
          Components: core engine, kie server
    Affects Versions: 6.5.0.Final
         Environment: Win7 x64, Tomcat 9, workbench-built DRL, managed KIE Server execution
            Reporter: Russell Morrisey
            Assignee: Mario Fusco


The following DRL query passes build and validation in the workbench, but fails at runtime in KIE Server:

{code:java}
query "questionsKnowledge" ()
    $question: Question()
    $visible: QuestionVisible(question == $question) or not QuestionVisible(question == $question)
end
{code}

The intent is that $visible may or may not be bound, depending on whether QuestionVisible is present. It looks like this causes an error in FlatQueryResults.(init):

{code:java}

15:59:30.897 ERROR o.k.s.s.d.DroolsKieContainerCommandServiceImpl - Error calling container 'qna2'
java.lang.NullPointerException: null
        at org.drools.core.QueryResultsRowImpl.getFactHandle(QueryResultsRowImpl.java:99) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.QueryResultsRowImpl.getFactHandle(QueryResultsRowImpl.java:95) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.runtime.rule.impl.FlatQueryResults.<init>(FlatQueryResults.java:116) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.command.runtime.rule.QueryCommand.execute(QueryCommand.java:109) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.command.runtime.rule.QueryCommand.execute(QueryCommand.java:39) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:137) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:51) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.drools.core.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:254) ~[drools-core-6.5.0.Final.jar:6.5.0.Final]
        at org.kie.server.services.drools.RulesExecutionService.call(RulesExecutionService.java:52) ~[kie-server-services-drools-6.5.0.Final.jar:6.5.0.Final]
        at org.kie.server.services.drools.DroolsKieContainerCommandServiceImpl.callContainer(DroolsKieContainerCommandServiceImpl.java:69) ~[kie-server-services-drools-6.5.0.Final.jar:6.5.0.Final
]
        at org.kie.server.remote.rest.drools.CommandResource.manageContainer(CommandResource.java:72) [kie-server-rest-drools-6.5.0.Final.jar:6.5.0.Final]
{code}








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