Hi, As suggested, I made the following changes, to get the desired output. I have some questions regarding the approach to agenda-groups (in drools 5 context) 1. I had to enable auto-focus once per each agenda-group. I thought agenda-groups were stacked internally by drools engine, and auto-focus might be acting as a directional mechanism (help determine which rule under which agenda is to be triggered). Clearly, I am mistaken and it seems that auto-focus is the way to go. I would like to know about other ways to set focus on agenda-groups. I have seem code snippets on google bearing session.setFocus("[agenda-group-name]"). I am currently using statefulsession and cann't figure out this 'setFocus()' method 2. I was 'compelled' to comment out lock-on-active directive. I understand that lock-on-active is an variant of no-loop causing each fact to be passed to the rule only once in a active agenda (correct me if I am mistaken). With lock-on-active set, I was expecting the messages to be print once atleast, but the current behavior beats me. Code is given below: package com.mscibarra.examples.drools.controllers; import com.mscibarra.examples.drools.domainentities.*; rule "Detect and Remove Duplicate Shelves" agenda-group "Phase1" //lock-on-active dialect "mvel" auto-focus when $universe : LibraryUniverse() $shelf : Shelf() from $universe.shelves $shelf2 : Shelf(this != $shelf) from $universe.shelves then System.out.println("Duplicate Shelves found::"+$shelf); // without the modify(), drools is not alerted about changes /* modify($universe) { shelves.remove($shelf); }; */ end rule "Singleton Shelf Detector" agenda-group "Phase2" //lock-on-active dialect "mvel" auto-focus when $universe : LibraryUniverse(shelves.size > 1) then System.out.println("Multiple Shelves found::"+$universe.shelves.size); end With Regards, Swaroop --------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------- Message: 3 Date: Mon, 2 Nov 2009 10:51:32 -0500 From: Edson Tirelli <ed.tirelli(a)gmail.com&gt; Subject: Re: [rules-users] Agenda Groups basic question To: Rules Users List <rules-users(a)lists.jboss.org&gt; Message-ID: <e6dd5ba30911020751nb973184r73cd6dc46e4e50c0(a)mail.gmail.com&gt; Content-Type: text/plain; charset="windows-1252" You need to set the focus for an agenda group to execute. []s Edson 2009/11/2 Rongala, Kanthi <Kanthi.Rongala(a)mscibarra.com&gt; > Hi, > > > > I am new to Drools and trying my hands out at Drools 5. I cann?t figure out > how to use agenda- groups. I have a small drl file with two agenda groups > and one rule per agenda-group. This doesn?t seem to work. However if I > happen to comment out the agenda-group attribute, the results are as > expected. > > > > Please let me know what I am missing. > > > > *package* com.mscibarra.examples.drools.controllers; > > > > *import* com.mscibarra.examples.drools.domainentities.*; > > > > > > *rule* "Detect and Remove Duplicate Shelves" > > *agenda-group* "Phase1" > > *lock-on-active* > > *dialect* "mvel" > > *when* > > $universe : LibraryUniverse() > > $shelf : Shelf() *from* $universe.shelves > > $shelf2 : Shelf(*this* != $shelf) *from*$universe.shelves > > *then* > > System.out.println("Duplicate Shelves found::"+$shelf); > > // without the modify(), drools is not alerted about changes > > // $universe.shelves.remove($shelf); > > /* > > *modify*($universe) { > > shelves.remove($shelf); > > }; > > */ > > > > *end* > > > > *rule* "Singleton Shelf Detector" > > *agenda-group* "Phase1" > > *lock-on-active* > > *dialect* "mvel" > > *when* > > $universe : LibraryUniverse(shelves.size > 1) > > *then* > > System.out.println("Multiple Shelves found::"+$universe.shelves.size); > > > *End* > > > > > > > > With Regards, > > Kanthi Swaroop Rongala > > * * > > > > ------------------------------ > NOTICE: If received in error, please destroy and notify sender. Sender does > not intend to waive confidentiality or privilege. Use of this email is > prohibited when received in error. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > > -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.jboss.org/pipermail/rules-users/attachments/20091102/e88d48d... ------------------------------ Message: 4 Date: Mon, 2 Nov 2009 16:53:54 +0100 From: "Costigliola Joel \(EXT\)" <joel.costigliola-ext(a)natixis.com&gt; Subject: Re: [rules-users] Agenda Groups basic question To: "'Rules Users List'" <rules-users(a)lists.jboss.org&gt; Message-ID: <201216F96E6D724F9296BFACF6DB54641E54C88380(a)MSEUMAIL03.cib.net&gt; Content-Type: text/plain; charset="iso-8859-1" Hello, Maybe a typo mistake but both of your rules have the same agenda group (Phase1) Regards, Joel NOTICE: If received in error, please destroy and notify sender. Sender does not intend to waive confidentiality or privilege. Use of this email is prohibited when received in error. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users