http://blog.gmane.org/gmane.comp.java.drools.user hourly 1 1901-01-01T00:00+00:00 http://gmane.org/img/gmane-25t.png http://gmane.org http://comments.gmane.org/gmane.comp.java.drools.user/13109 I have a number of questions as it relates the creation of rule flows: 1) I am assuming that when creating the constraints within a given node within a rule flow that the selection of "rule" as the type will create a rule behind the scenes while selection of "code" will create some java object representation? If this is a correct understanding is there any preference from an engine perspective, are there performance or other considerations that must be taken into account? 2) Is there any way to precompile rule flows like rule files are (as opposed to at runtime with a call to packageBuilder.addRuleFlow(source))? With the Drools builder any errors in the .drl files are highlighted. Not so with the .rf. In order to see what is generated it appears that you have to step through in debug mode at runtime and buried inside there is a string representation of everything that was generated as well a list of errors which refer to errors such as parse errors. Unfortunately this manifests itself eventually (at leas keithnielsen 2008-12-01T16:47:21 http://comments.gmane.org/gmane.comp.java.drools.user/13101 Hello, I'd like to use enum in java 1.5 with drools. I try that : A message class : package com.pv.rules.beans; public class Message { String payload; Type type; public enum Type { XML; } public Message(){ this.type = Type.XML; } public Message(String payload){ this.type = Type.XML; this.payload = payload; }; public String getPayload(){ return payload; } public void setPayload(String payload){ this.payload = payload; } public Type getType(){ return type; } } and in my drl : rule "Contexte1" when >msg : Message(type == "XML", payload : payload) xpathEquals "/Root/aaaa" "bbbb" xpathEquals "/Root/cccc" "dddd then Log : "Contexte 1 ************* : OK"; end but I've this error : Unable to resolve ObjectType 'Message' : [Rule name=Contexte1, agendaGroup=MAIN, salience=0, no-loop=false] Rule Compilation error : [Rule name=Contexte1, agendaGroup=MAIN, salience=0, no-loop=false] Do you have an idea? Thanks :-) _______________________________________________ ru Thierry B 2008-12-01T10:01:33 http://comments.gmane.org/gmane.comp.java.drools.user/13100 Hello, I've a question about drl and dsl with drools 4.0. I've this rule : rule "Contexte1" when msg : Message(payload : payload) eval (DOMUtil.xpathEquals(payload, "/Root/aaaa", "bbb")) eval (DOMUtil.xpathEquals(payload, "/Root/cccc", "dddd")) then System.out.println ("Contexte 1 ************* : OK"); end I use a dsl, to make it work, so now my drl is like that : rule "Contexte1" when >msg : Message(payload : payload) xpathEquals "/Root/aaaa" "bbb" xpathEquals "/Root/cccc" "dddd" then Log : "Contexte 1 ************* : OK"; end I was forced to make an ">" at the line "msg : Message(payload : payload)" otherwise, he tells me that he can't expand that line. There is a way to : - avoid to put the ">" even if I have to add something else to the dsl ? - avoid the line "msg : Message(payload : payload)" in my drl and simplify my dsl so that xPathEquals "know" that the "payload" variable come from any object Message in Working Memory ? Thanks :-) _________________________ Thierry B 2008-12-01T08:56:15 http://comments.gmane.org/gmane.comp.java.drools.user/13098 Hi. I'm newbie to Drools. I'm just wondering how I define the rules with my web application that has several layers, web,business-logic,and data access. one rule is used in the wab layer, and another one is used in the business-logic layer. Both rule's "when" are the same, but the "then"(action) is different. It looks like code dupulication. (I mean when the "when" changes, every rules that has same "when" has to be changed, right?) What's the recommended way in this situation? thanks Shige _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Shigeaki Wakizaka 2008-12-01T04:28:02 http://comments.gmane.org/gmane.comp.java.drools.user/13095 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Waleed Zedan 2008-11-30T12:27:23 http://comments.gmane.org/gmane.comp.java.drools.user/13092 I am working on an application that tells how much insulin should be given to a patient with different glucose values. I have a decision object that contains the current value of glucose and the rules alter the decision object to include advice or explanations. Since the decision object is modified, I have to have some kind of state object so that rules do not loop; I have created a state object that has a series of boolean fields which are checked. However, this feels like I am circumventing the whole idea of an inference engine. So I have made an alternative helper class that contains inner classes that can be inserted as facts. Here is a sample rule with the first method: [code] rule "Detect mild hypoglycemia" when decision : GlucoseDecision( serumGlucoseConcentration < 80, serumGlucoseConcentration >= 60 ) decisionState : GlucoseDecisionState(currentGlucoseBelowRange == true, mildHypoglycemia == false) then decisionState.setMildHypoglycemia(true); decision.explain("The patien Mike Dean 2008-11-28T23:47:31 http://comments.gmane.org/gmane.comp.java.drools.user/13088 I have rule that logical comparison with two Float fields(like price < bidPrice || price >= bidPrice ). I get following exception if one of field is null. Is this expected behaviour? Please clarify. Thanks Caused by: java.lang.NullPointerException at org.drools.base.extractors.BaseObjectClassFieldExtractor.getFloatValue(BaseObjectClassFieldExtractor.java:84) at org.drools.base.ClassFieldExtractor.getFloatValue(ClassFieldExtractor.java:191) at org.drools.base.evaluators.FloatFactory$FloatLessEvaluator.evaluate(FloatFactory.java:250) at org.drools.rule.VariableRestriction.isAllowed(VariableRestriction.java:73) at org.drools.rule.VariableConstraint.isAllowed(VariableConstraint.java:67) at org.drools.rule.AndConstraint.isAllowed(AndConstraint.java:47) at org.drools.rule.OrConstraint.isAllowed(OrConstraint.java:50) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:22) at org.drools.reteoo.Alp techy 2008-11-28T21:36:30 http://comments.gmane.org/gmane.comp.java.drools.user/13085 Ok, I tried to upgrade from M2 to M3. Big Mistake I see that you have attempted to separate the interface from the implementation by moving most of the interfaces that are intended for public consumption from drools-core to a new jar file called drools-api. Unfortunately there appears a few different problems with this 1) Unfortunately you have duplicated package names (drools.core) as well duplicated numerous classes across the two jar files (WorkingMemoryEntryPoint and FactHandle to name a few) 2) StatefulSession interface has not been moved to drools-api and only exist in drools-core This makes this build unusable in Eclipse 3.4 as is. Also I am using Eclipse as a runtime platform and this makes it impossible to simply expose the api classes as intended, because when you you embed the rules engine as a plugin you have to expose those packages containing the api you wish to expose, in drools case that would be drools-api, unfortunately StatefulSession is still in drools-core for example forcing me t keithnielsen 2008-11-28T01:35:31 http://comments.gmane.org/gmane.comp.java.drools.user/13074 though I referred other thread about this topic, I'm not successful to make a dao call. I beg your pardon to ask again. 1. I want to pass the fact object to the dao function which returns boolean. I tried following rule and getting " Unexpected token '$fact'" as eclipse compilation error. Please guide with right syntax. global RuleDAO dao; rule "test DAO call" $fact : Fact(some condition) fact : Fact(dao.isValid($fact)) then #do something end 2. Will be there any performance issue for above kind of rule? Thanks techy 2008-11-26T21:08:40 http://comments.gmane.org/gmane.comp.java.drools.user/13073 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Michal Bali 2008-11-26T20:40:14 http://comments.gmane.org/gmane.comp.java.drools.user/13067 Hi, The business requirements are as follows. We have 3 rules which need to be fired depending upon the criteria which will be met. We have an order object which has various orderline items and the following business rules need to be executed depending upon the inserted facts. •If a particular item is on discount, the discount % is applied to the line item. •If the quantity for a particular item is greater than 10, an added 10% discount is given for the order. •If the total order amount is greater than 1000, then an additional 5% discount is given on the order. The above rules need to be executed at the same time. In This case i tryed all the conditions it's working fine.But, rule "Apply 5% discount if Total Price greater than 1000" is not fired. package com.sample.orderItem import com.sample.orderItem.DiscountDetails import com.sample.orderItem.ItemQuantity import com.sample.orderItem.PriceCal import com.sample.orderItem.PriceDetails expander Sample.dsl rule "Purchase Item" salie manyasri.m 2008-11-26T18:52:17 http://comments.gmane.org/gmane.comp.java.drools.user/13065 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Kris Nuttycombe 2008-11-26T17:35:57 http://comments.gmane.org/gmane.comp.java.drools.user/13061 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Anthony MailingList 2008-11-26T08:27:03 http://comments.gmane.org/gmane.comp.java.drools.user/13059 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Nimesh Muley 2008-11-26T06:02:27 http://comments.gmane.org/gmane.comp.java.drools.user/13058 hi, We are using Drools 4.0.7 in a web application deployed in WebSphere 6.1. Occasionally, we have rule engine failure caused by RuntimeDroolsException (whose root cause is shown as ClassCastException) when firing rules. Other times, the rules are executing without errors. Here is the stack trace of the exception. What are the possible reasons? Thanks, Seema org.drools.RuntimeDroolsException: Exception executing predicate eval( inventory.leaseInformation != null ) at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:216) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:145) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:318) at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:162) at org.drools.reteoo.Rete.assertObject(Rete.ja seemamani 2008-11-26T04:47:53 http://comments.gmane.org/gmane.comp.java.drools.user/13057 What could be the reason for no activation of any rule, when there should have been an activation for sure, because right object was inserted in the session and prior to that, rule parsing did not result in any error? Also, the audit log has this message, when that happens. <object-stream> <list> <org.drools.audit.event.ObjectLogEvent> <factId>1</factId> <objectToString>com.uhg.scs.optum.ng.hibernate.Person< at >31f2a7</objectToString> <type>1</type> </org.drools.audit.event.ObjectLogEvent> </list> </object-stream> vanshi 2008-11-26T04:47:48 http://comments.gmane.org/gmane.comp.java.drools.user/13053 Can somebody plz look in to this? I'm writing a java standalone program to test my rules. This is reading in 32 of properties (name/value pairs) from property file and then takes those name value pairs and creates a Java object (bean). Then this object is inserted in the session and sent to the rule engine to fire rules, which based on some conditions ...fires a set of rule. What happening is that my unit tests are running fine but similar object created from property file (same value of properties), no rule is getting fired. I've checked that all the properties of the java bean is getting set in the main() and when I send this object to rule engine....it enters the method of ruleEngine but no rule gets fired.... Take a look at the shortened version of code: public class DroolsTest { private static StatefulSession sess = null; private static FileInputStream in; private static Properties props=null; private static Person p; public static void readPropertyFiles(File f) { FileInputStream in = new Fil vanshi 2008-11-26T00:28:05 http://comments.gmane.org/gmane.comp.java.drools.user/13050 Two questions. I am interested in using RuleAgent but with the file or dir property rather than the URL. However, it is not clear to me where the directories or files must actually be located. If I use dir=/ then the DirectoryScanner is invoked and claims to have found some number of files, but I have no idea WHERE it is scanning. If I add anything like dir=/foo then I get an invalid directory exception. If I try file=/foo.pkg then I get exception that this is invalid file. Question 1 - is there an example somewhere that can help me understand where I am going off the track? I am working Eclipse environment. Question 2 - if using the BRMS and URL, can there be a backup dir, file, or cache option that is in the classpath rather than a specific directory? I would like to distribute an Eclipse application that has a rule package deployed, but that overrides this with the URL if available. Thanks. - Mike _______________________________________________ rules-users mailing list rul J Michael Dean 2008-11-25T13:58:13 http://comments.gmane.org/gmane.comp.java.drools.user/13049 Hello, I try to use several drl files declared with same package with a dsl, but it doesn't work. java.lang.RuntimeException: ExempleTest6.java *****************: Unable to compile drl files..... at com.pv.rules.test.Exemple6Test.readRule(Exemple6Test.java:85) at com.pv.rules.test.Exemple6Test.test1(Exemple6Test.java:35) at com.pv.rules.test.Exemple6Test.main(Exemple6Test.java:26) I have an Unexpected token from a word that I've define on my dsl which works if I use only one drl file. I used that to check errors: // Check the builder for errors if ( builder.hasErrors() ) { System.out.println( builder.getErrors().toString() ); throw new RuntimeException( "ExempleTest6.java *****************: Unable to compile drl files....."); } I use that in my java readRule method : private static RuleBase readRule() throws Exception { Reader source1 = new InputStreamReader( Exemple6Test.class.getResourceAsStream( "/com/p Thierry B 2008-11-25T08:36:43 http://comments.gmane.org/gmane.comp.java.drools.user/13048 Hello, I try to use several drl files declared with same package with a dsl, but it doesn't work. java.lang.RuntimeException: ExempleTest6.java *****************: Unable to compile drl files..... at com.pv.rules.test.Exemple6Test.readRule(Exemple6Test.java:85) at com.pv.rules.test.Exemple6Test.test1(Exemple6Test.java:35) at com.pv.rules.test.Exemple6Test.main(Exemple6Test.java:26) I have an Unexpected token from a word that I've define on my dsl which works if I use only one drl file. I used that to check errors: // Check the builder for errors if ( builder.hasErrors() ) { System.out.println( builder.getErrors().toString() ); throw new RuntimeException( "ExempleTest6.java *****************: Unable to compile drl files....."); } I use that in my java method : private static RuleBase readRule() throws Exception { Reader source1 = new InputStreamReader( Exemple6Test.class.getResourceAsStream( "/com/pv/rules/drl/Exemple61.drl" ) ); Reader source2 = new InputStreamReader( Exemple6Test Thierry B 2008-11-25T08:33:04 http://comments.gmane.org/gmane.comp.java.drools.user/13044 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Ittyavirah, Seegler 2008-11-25T02:48:03 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.java.drools.user