thanks for your input...this is exactly what i was looking for ! :) Joel G. Rivera-Gonzalez PRT "The first 90% of a project takes 90% of the time, the last 10% takes the other 90% of the time" - Murphy's Law ----- Original Message ---- From: Steven Williams <stevenw(a)objectconsulting.com.au&gt; To: Joel G. Rivera-González <el_pio(a)yahoo.com&gt; Cc: rules-users(a)lists.jboss.org Sent: Sunday, January 7, 2007 3:53:34 AM Subject: Re: Fw: [rules-users] rules questions... Hi Joel, I think you should rather use a global for the ArrayList: global java.util.List myList rule "cancel_menu" when MegaTransferObject(other_EffectiveOrderTypeDsl != null, other_EffectiveOrderTypeDsl == Constants.NEW_OPEN_ORDER_TYPE) not MegaTransferObject(orders_FkOrderStatusId != null, orders_FkOrderStatusId == Constants.PENDING_TO_BE_SUBMITTED_ORDER_STATUS) then myList.add(new String[]{Constants.SERVICE_ASSURANCE_TREE_MENU_DSL , Constants.SERVICE_ASSURANCE_MENU_CANCEL}); end btw - you don't need to put "and" at the end of each constraint. cheers Steve On 1/7/07, Joel G. Rivera-González <el_pio(a)yahoo.com&gt; wrote: this is a one of my rules... rule "cancel_menu" when arrayList : ArrayList() MegaTransferObject(other_EffectiveOrderTypeDsl != null, other_EffectiveOrderTypeDsl == Constants.NEW_OPEN_ORDER_TYPE) and not MegaTransferObject(orders_FkOrderStatusId != null, orders_FkOrderStatusId == Constants.PENDING_TO_BE_SUBMITTED_ORDER_STATUS ) then arrayList.add(new String[]{Constants.SERVICE_ASSURANCE_TREE_MENU_DSL , Constants.SERVICE_ASSURANCE_MENU_CANCEL}); end i do an assert of an empty arrayList... when i use this arrayList : ArrayList() on the when the rule fire an error...why? will the ArrayList be the same on all the rules (i think it will but want to make sure) Joel G. Rivera-Gonzalez PRT "The first 90% of a project takes 90% of the time, the last 10% takes the other 90% of the time" - Murphy's Law ----- Original Message ---- From: Kumaran S < kumaran.shanmuhan(a)gmail.com&gt; To: Joel G. Rivera-González <el_pio(a)yahoo.com&gt; Sent: Friday, January 5, 2007 5:42:01 PM Subject: Re: [rules-users] rules questions... getResourceAsStream(ruleDrl) expects to find a drl file based on the location represented by " ruleDrl". It should be noted that the location should be accessible from the CLASSPATH. You could get a null pointer exception, if the location is not accessible from your CLASSPATH. On 1/5/07, Joel G. Rivera-González <el_pio(a)yahoo.com&gt; wrote: Trying to figure out the new rule system... but it doesnt work... This is my rule: package com.prtc.struts.rules import com.prtc.db.MegaTransferObject import java.util.ArrayList import com.prtc.struts.Constants rule "cancel_menu" when megaTO : MegaexistMegaTransferObject() megaTO(other_EffectiveOrderTypeDsl != null) and megaTO(other_EffectiveOrderTypeDsl == Constants.NEW_OPEN_ORDER_TYPE ) and megaTO(orders_FkOrderStatusId != null) and megaTO(orders_FkOrderStatusId == Constants.PENDING_TO_BE_SUBMITTED_ORDER_STATUS) then System.out.println("Hello"); end part of my code: InputStreamReader ir = new InputStreamReader(RuleBuilderMgr.class.getClassLoader().getResourceAsStream(ruleDrl)); //the null pointer is from this line. builder.addPackageFromDrl(ir); this is the result: 7661 [main] DEBUG org.apache.commons.jci.compilers.JaninoJavaCompiler - compiling com.prtc.struts.rules.Rule_cancel_menu_0 7942 [main] DEBUG org.apache.commons.jci.compilers.JaninoJavaCompiler - compile com.prtc.struts.rules.Rule_cancel_menu_0 8062 [main] DEBUG org.apache.commons.jci.compilers.JaninoJavaCompiler - compiled com.prtc.struts.rules.Rule_cancel_menu_0 8062 [main] DEBUG org.apache.commons.jci.compilers.JaninoJavaCompiler - compiling com.prtc.struts.rules.Rule_cancel_menu_0ConsequenceInvoker 8072 [main] DEBUG org.apache.commons.jci.compilers.JaninoJavaCompiler - compile com.prtc.struts.rules.Rule_cancel_menu_0ConsequenceInvoker 8092 [main] DEBUG org.apache.commons.jci.compilers.JaninoJavaCompiler - compiled com.prtc.struts.rules.Rule_cancel_menu_0ConsequenceInvoker 8102 [main] FATAL com.prtc.struts.util.ConstructServiceAssuranceTreeMenu - Exception in ShowIspServiceAssuranceAction.execute --> java.lang.NullPointerException 8102 [main] FATAL com.prtc.struts.util.ConstructServiceAssuranceTreeMenu - java.lang.NullPointerException at com.prtc.struts.util.ConstructServiceAssuranceTreeMenu.construct(ConstructServiceAssuranceTreeMenu.java:74) at com.prtc.lc.rules.managers.RuleTester.test1(RuleTester.java:299) at com.prtc.lc.rules.managers.RuleTester.main(RuleTester.java:54) Joel G. Rivera-Gonzalez PRT "The first 90% of a project takes 90% of the time, the last 10% takes the other 90% of the time" - Murphy's Law _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Give me a lever long enough... Single-handed, I shall move the world! _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users -- Steven Williams Supervising Consultant Object Consulting Office: 8615 4500 Mob: 0439 898 668 Fax: 8615 4501 stevenw(a)objectconsulting.com.au www.objectconsulting.com.au consulting | development | training | support our experience makes the difference