[rules-users] How to check if a property IS null ?

[Hendy Irawan]

Thank you.

"this == null" is weird indeed in Java, but I honestly don't know how to
express this expression in Drools DSL.

A more realistic rule would be:

when 
    $product : Product( )
    Double( this == null ) from bookingService.getQty( $product ) 

So what I want to do is detect when a method call returns null. The method
call can contain parameters but it can be a simple method like before.

How to do this?

Thank you.

Hendy



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