[jboss-jira] [JBoss JIRA] (DROOLS-561) Having a shared Query Node as last node of a segment causes a NPE

[Mario Fusco (JIRA)]

     [ https://issues.jboss.org/browse/DROOLS-561?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mario Fusco reassigned DROOLS-561:
----------------------------------

    Assignee: Mario Fusco  (was: Mark Proctor)


> Having a shared Query Node as last node of a segment causes a NPE
> -----------------------------------------------------------------
>
>                 Key: DROOLS-561
>                 URL: https://issues.jboss.org/browse/DROOLS-561
>             Project: Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>            Reporter: Mario Fusco
>            Assignee: Mario Fusco
>
> Having a shared Query Node as last node of a segment causes a NPE as in the following test case
> {code}
>     @Test
>     public void testSharedQueryNode() throws Exception {
>         String drl =
>                 "query find( Integer $i, String $s )\n" +
>                 "    $i := Integer( toString() == $s )\n" +
>                 "end\n" +
>                 "\n" +
>                 "rule R2 salience -1 when\n" +
>                 "    $s : String()\n" +
>                 "    ?find( i, $s; )\n" +
>                 "then\n" +
>                 "end\n" +
>                 "rule R1 when\n" +
>                 "    $s : String()\n" +
>                 "    ?find( i, $s; )\n" +
>                 "    $i : Integer( this == 1 ) from i\n" +
>                 "then\n" +
>                 "    delete( $s );\n" +
>                 "end\n";
>         KieHelper helper = new KieHelper();
>         helper.addContent( drl, ResourceType.DRL );
>         KieSession ksession = helper.build().newKieSession();
>         ksession.insert("1");
>         ksession.insert(1);
>         ksession.fireAllRules();
>     }
> {code}
> causes a NullPointerException like:
> java.lang.NullPointerException
> 	at org.drools.core.common.LeftTupleSetsImpl.removeInsert(LeftTupleSetsImpl.java:136)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.deleteLeftChild(RuleNetworkEvaluator.java:754)
> 	at org.drools.core.phreak.PhreakQueryNode.doLeftDeletes(PhreakQueryNode.java:175)
> 	at org.drools.core.phreak.PhreakQueryNode.doNode(PhreakQueryNode.java:31)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.evalQueryNode(RuleNetworkEvaluator.java:464)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:353)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
> 	at org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
> 	at org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:216)
> 	at org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:91)
> 	at org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:964)
> 	at org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1234)



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