[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1644) Make drools imply null checks before trying to read a value

[Mark Proctor (JIRA)]

    [ http://jira.jboss.com/jira/browse/JBRULES-1644?page=comments#action_12417219 ] 
            
Mark Proctor commented on JBRULES-1644:
---------------------------------------

anything with nest values is MVEL, so we don't have control over that. We do safe null handling on anything that is a direct field of an object, for nested objects everything is delegated to MVEL.

> Make drools imply null checks before trying to read a value
> -----------------------------------------------------------
>
>                 Key: JBRULES-1644
>                 URL: http://jira.jboss.com/jira/browse/JBRULES-1644
>             Project: JBoss Drools
>          Issue Type: Feature Request
>          Components: Drl Parser/Builder
>    Affects Versions: 4.0.6
>         Environment: all
>            Reporter: Alex McCarrier
>         Assigned To: Mark Proctor
>            Priority: Minor
>             Fix For: FUTURE
>
>   Original Estimate: 0 minutes
>  Remaining Estimate: 0 minutes
>
> Not sure if this is MVEL or drools itself, but it would be nice if it would do null checks on fields for you rather than having the rule author do it.  Example, when doing something like:
> when
>    Object(value1.value2 == something)
>   
>   
> before attempting to read value2 it makes sure value1 is not null, and if value1 is null than rather than throwing an error like it does currently, just consider the rule as not matching.

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