[jboss-jira] [JBoss JIRA] Closed: (JBRULES-1827) comparing fact property to global causes NPE if global is set after the fact but before fireAllRules

[Mark Proctor (JIRA)]

     [ https://jira.jboss.org/jira/browse/JBRULES-1827?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Mark Proctor closed JBRULES-1827.
---------------------------------

    Resolution: Won't Fix


Field evaluation is done at insert time, any globals that are relied on must be set prior to the insert. I see no other way around this.

> comparing fact property to global causes NPE if global is set after the fact but before fireAllRules
> ----------------------------------------------------------------------------------------------------
>
>                 Key: JBRULES-1827
>                 URL: https://jira.jboss.org/jira/browse/JBRULES-1827
>             Project: JBoss Drools
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: drools-core
>    Affects Versions: 4.0.7
>         Environment: Vista
>            Reporter: David Hill
>            Assignee: Mark Proctor
>
> This will cause an NPE prior to firing any rules, the NPE will occur at the workingMemory,insert statement.
> The workaround is to set the global before adding the Score fact.
> Java code:
> workingMemory.insert(new Score(1.23));  //has public Double named myScore initialized in constructor
> workingMemory.setGlobal("highPoint", 0.5);
> Drools code:
> global Double highPoint;
> rule "bootstrap1"
> when
>     $s : Score(myScore > highPoint);
> then
>     System.out.println("bootstrap1");
> end

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