"this" in DRL is just like "this" in Java. "this == null" is just another way of saying "false".
-W On 15/08/2012, Hendy Irawan <he...@soluvas.com> wrote: > 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 > > > > -- > View this message in context: > http://drools.46999.n3.nabble.com/How-to-check-if-a-property-IS-null-tp4019014p4019155.html > Sent from the Drools: User forum mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
