Great ! It even works with a long. Many thanks. Benoît Date: Wed, 10 Mar 2010 14:34:57 +0000 From: ejdiggins(a)gmail.com To: rules-users(a)lists.jboss.org Subject: Re: [rules-users] Template salience Hi, Yes it is possible but I think the function has to return an int. Also, it should be called as follows: rule &quot;Periode(a){row.rowNumber}&quot; salience ( getNbJours("@{ddeb}", "@{dfin}") ); Include the stack trace from the NPE if this doesn't work. Cheers, Enda 2010/3/10 Bertrand Grottier <b_grottier(a)hotmail.com&gt; Hello, Is it possible to specify a template salience such as: function long getNbJours(String pStrDDeb, String pStrDFin) { SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy"); Date dDeb = sdf.parse(pStrDDeb) ; Date dFin = sdf.parse(pStrDFin) ; long diff = dFin.getTime() - dDeb.getTime() ; return (diff / (24 * 60 * 60 * 1000)) ; } template "tarification_produit" rule &quot;Periode(a){row.rowNumber}&quot; salience getNbJours("@{ddeb}", "@{dfin}") when $p : Produit(id == 1, eval( dDeb.before( getDate("@{ddeb}") ) ) ) then $p.setId(2) ; $p.setPrix(@{prix}) ; update( $p ); end end template I encounter a java.lang.NullPointerException. Thank you in advance for your help. Regards, Benoît Acheter en ligne en toute sécurité ? Internet Explorer 8 vous protège gratuitement ! _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Enda J Diggins _________________________________________________________________ Hotmail et MSN dans la poche? HOTMAIL et MSN sont dispo gratuitement sur votre téléphone! http://www.messengersurvotremobile.com/?d=Hotmail