2009/5/13 Shabbir Dhari <sdh...@hotmail.com> > Thanks for all you efforts :) but what is the difference between calling > function from every rule or putting null check. >
It's much easier to add. > I give up. I am looking for other rule engines. > As they must apparently (due to JavaBeans) be Java-based, I'd be very much surprised if you'll find what you are looking for. -W > > > ------------------------------ > Date: Wed, 13 May 2009 12:19:08 +0200 > > Subject: Re: [rules-users] NullPointerException with Wrapper objects > From: wolfgang.l...@gmail.com > To: rules-users@lists.jboss.org > > Well, I hope you get paid for all the extra work ;-) > > Define, in your .drl file, > > function float safe( Float v ){ > return v == null ? 0 : v; > } > > and wrap all references to the "dangerous" field(s) in your LHS pattern > expressions with this call, except, of course, in the rule where you fix and > log the field. > > -W > > > > 2009/5/13 Shabbir Dhari <sdh...@hotmail.com> > > Well I cant explain you all the issues and requirements here. Simply we > dont have provision to do so. We have to check the null in the rules and log > the message plus other evaluation and arithmetic. > > ------------------------------ > Date: Wed, 13 May 2009 10:36:59 +0200 > > Subject: Re: [rules-users] NullPointerException with Wrapper objects > From: wolfgang.l...@gmail.com > To: rules-users@lists.jboss.org > > But you do control the insertion of your facts. Rather than cluttering > rules with conditions dealing with irregular values, preprocess the object. > And you should be able to log from there, just as well. > -W > > 2009/5/13 Shabbir Dhari <sdh...@hotmail.com> > > I can not initialize property as need to log the message. The bean comes > from outside our application scope. We do not have control to make them > menodatory. And we need to log the message. You mean there is no solution of > this problem? And remember my second rule does not compare propery but > it performs some calculations. > > ------------------------------ > Date: Wed, 13 May 2009 09:01:05 +0200 > Subject: Re: [rules-users] NullPointerException with Wrapper objects > From: wolfgang.l...@gmail.com > To: rules-users@lists.jboss.org > > What about setting the field to 0 in the constructor of Salary? > Or using float (not java.lang.Float)? > -W > > 2009/5/13 Shabbir Dhari <sdh...@hotmail.com> > > I know this work around. But I have more than 50 rules using that attribute > and it looks very ugly to put null on every rule and its not single > attribute. There are more than 30 attributes in the bean and using them in > LHS. Any other sophisticated way? > > > Date: Tue, 12 May 2009 23:15:54 -0700 > > From: greg_bar...@yahoo.com > > Subject: Re: [rules-users] NullPointerException with Wrapper objects > > To: rules-users@lists.jboss.org > > > > > > All conditions of all applicable rules are evaluated when you insert an > object into working memory. This decides which rule actions can go on the > agenda. Only when a rule action is on the agenda is the salience used to > determine the order of action firing. So doing the null check in the way > you're doing it will not work. > > > > You must put the null check in the same rule, before the potentially null > property is used. > > > > rule "Nett Salary" salience 70 > > when > > Salary ( loanDeduction != null, nett != ( gross – loanDeduction – pf) ) > > then > > log("Invalid nett salary amount"); > > end > > > > > ------------------------------ > Check out the new Windows Live Messenger Looking for a fresh way to share > your photos? <http://windowslive.ninemsn.com.au/article.aspx?id=792335> > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > ------------------------------ > Click Here View photos of singles in your > area<http://a.ninemsn.com.au/b.aspx?URL=http://dating.ninemsn.com.au/search/search.aspx?exec%3Dgo%26tp%3Dq%26gc%3D2%26tr%3D1%26lage%3D18%26uage%3D55%26cl%3D14%26sl%3D0%26dist%3D50%26po%3D1%26do%3D2%26trackingid%3D1046138%26r2s%3D1&_t=773166090&_r=Hotmail_Endtext&_m=EXT> > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > ------------------------------ > Find out how with Windows Live! Want to stay on top of your life > online?<http://windowslive.ninemsn.com.au/> > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > > > ------------------------------ > Find out how with Windows Live! Want to stay on top of your life > online?<http://windowslive.ninemsn.com.au/> > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > >
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