Re: [rules-users] null POJO attribute causing template issues -- is there a better way?

Hi, I'm using a template to validate information in my POJO. I've got a row for the different valid possibilities. My template rule (in guvnor) looks like: WHEN There is a MyBean[$mb] with: itemname matches templateItemName cost greater than templateCost caveat matches templateCaveat THEN . 8< (I have columns in my template for templateItemName, templateCost and templateCaveat). Almost always, I don't care about the value in $mb.caveat, so I have a ".*" in the entry for that row. This works fine as long as $mb bean has a caveat (ie, $mb.caveat !=null). But when caveat is null the check for caveat matches templateCaveat (where templateCaveat = ".*") fails. I tried the regex ".*|null" but that doesn't work either, which I suppose isn't so surprising (although I never see a NPE error msg). Modifying the template like this doesn't work: itemname matches templateItemName cost greater than templateCost any of the following: caveat==null caveat matches templateCaveat because when a null valued caveat comes in, this then matches both the rule I want to fire and the lone one or two with a constraint on that field (something other than ".*"). I know I can set the salience so that the rows with ".*" fire first, but that seems REALLY ugly. I also considered putting in a rule with a high salience that adds a dummy caveat if one doesn't exist, but this still seems somewhat ugly. What I'd like to do is have a constraint such as: if caveat matches templateCaveat or (if caveat is null and templateCaveat does not match ".*") Does anyone have any insight about the best way to implement this? Thank you, -J -- View this message in context: http://drools.46999.n3.nabble.com/null-POJO-attribute-causing-template-is... Sent from the Drools: User forum mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users