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/13156 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Zhang Jing-A52198 2008-12-03T23:51:53 http://comments.gmane.org/gmane.comp.java.drools.user/13148 Since my last post was so nicely hijacked I have started a new thread in the hopes that the Drools team can shed some light on this. My setup is as follows: 1) 2 plug-ins, one containing the drools libraries, and a second plugin containing the facts and the rule file. 2) The rules engine plugin has a buddy-policy of "registered" and the facts plugin has the rules engine plugin as a registered buddy. Here is the rule(although any fact that has field assignments fails) rule "Retrieve CID Presentation Model" ruleflow-group "RetrieveCID" when CIDPresentationModel($cidValue:cidValue,$cidExpirationDate:expirationDate) then boolean cidResult = cidService.verifyCIDIsValid($cidValue,$cidExpirationDate); CIDResult result = new CIDResult(cidResult); insert(result); System.out.println("Executing: Retrieve CID Presentation Model"); end Deep in the bowels of drools there is a call to ClassFieldAccessorFactory.getClassFieldReader where it attempts to create a class using the byte array classloader, i.e. final Class<?> newClass = byteArrayClassLoader.defineClass(className, bytes,PROTECTION_DOMAIN). Its at this point that a NoClassDefFoundError on the BaseObjectClassFieldReader. I am a little concerned when I see what appears to be a custom classloader since if you are going to embed the rules engine it should respect the classloader hierachy from the container, whether that be an app server like Websphere or client side container like Eclipse. I am wondering if the team has had success with this particular setup (the examples for Drools work cause they are all in the same plugin). I have made the example as simple as possible but still no luck. Seems like this is pretty basic functionality so I can't imagine this hasn't been tested. keithnielsen 2008-12-03T14:53:23 http://comments.gmane.org/gmane.comp.java.drools.user/13147 Hi, I´m totally new to Drools and DRL. I want / (better words I must, because of my diploma thesis) to connect a couple of different software-applictions using Drools as logical middleware. First i want to translate some kind -like the following ones- of natural rules into DRL and I have no idea how to do this in correct way. Facts are - Order Order contain information about "creationDate" and "customerBelongingTo" - Customer Customer contains information (=days as int value) about "allowedTimePeriodWithoutNewIncomingOrder", on expiry of this time period this customer should me marked to inform a "Person" - Persons There are living persons(maybe) which are interested in "customersWithNoNewIncomingOrder". The should be informed by mail, etc. Please any idea to do this in best DRL way? Thanks Thorsten Trägenap _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Thorsten Trägenap 2008-12-03T14:01:51 http://comments.gmane.org/gmane.comp.java.drools.user/13144 Hello, It seems that Drools 3 performs better for us (at least for now...) then Drools 4. Drools 5 was not yet tested. I'm wondering what is the most efficient method of implementing Drools 4 activation-group[1] feature using Drools 3 ? In my system, in order to complete the match session I'm using a combination of 2 rules one (and only one!) of them must pass so that the match will be successful. I would like to use a XOR between them and give higher salience to the first rule which is a light weight version of the second. My motivation is keep drools from evaluating the second more complex structure of the "heavy" rule as fast as possible. So, to summarize - How would you guys recommend implementing the XOR structure between 2 Multiplicative inverse rules ? Thank you, Maxim. [1] http://downloads.jboss.com/drools/docs/4.0.7.19894.GA/html_single/index.html#d0e3088 -- Cheers, Maxim Veksler "Free as in Freedom" - Do u GNU ? _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Maxim Veksler 2008-12-03T11:41:58 http://comments.gmane.org/gmane.comp.java.drools.user/13139 I have the following rule: rule "Retrieve CID Presentation Model" ruleflow-group "RetrieveCID" when CIDPresentationModel($cidValue:cidValue,$cidExpirationDate:expirationDate) then boolean cidResult = cidService.verifyCIDIsValid($cidValue,$cidExpirationDate); CIDResult result = new CIDResult(cidResult); insert(result); System.out.println("Executing: Retrieve CID Presentation Model"); end Deep in the bowels of drools there is a call to ClassFieldAccessorFactory.getClassFieldReader where it attempts to create a class using the byte array classloader, i.e. final Class<?> newClass = byteArrayClassLoader.defineClass(className, bytes,PROTECTION_DOMAIN). Its at this point that a NoClassDefFoundError on the BaseObjectClassFieldReader. two sources of the same class in the classpath or if there is some reference from the class resulting in the error to another class that can not be resolved. It only appears in situations where there is fields involved. It doesnt seem to matter how simple the object is, the minute I try to use field assignment it throws an error. The rules engine is running as an Eclipse plug-in. keithnielsen 2008-12-02T22:14:53 http://comments.gmane.org/gmane.comp.java.drools.user/13134 Is there some documentation which summarizes the new features in Guvnor that were not in the older version of the BRMS? I saw a blog http://blog.athico.com/2008/04/brms-for-drools-5.html which had information on the Guvnor, but not sure if all the new features were discussed in that. Thanks, Seema seemamani 2008-12-02T17:17:38 http://comments.gmane.org/gmane.comp.java.drools.user/13128 I don't know whether this is the right place for this question. The Rete Tree view of the Eclipse drl editor does fails for the example drl fild, with "Rete Tree Build Error". I tried the suggestion given in http://www.nabble.com/Problems-with-drools-4.0.7-examples-tp18091849p18095457.html as well, but does not work. Did any one experienced the same thing ... I have Version: 2.0.0.Beta1-R200810311334 of Jboss Tools on Eclipse, Version: 3.4.1 Build id: M20080911-1700 Stack Trace: java.lang.Exception: Unable to parse rules to show RETE view! at org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:147) at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121) org.drools.RuntimeDroolsException: Unable to resolve class 'com.sample.DroolsTest$Message' at org.drools.base.ClassFieldAccessorCache.getClass(ClassFieldAccessorCache.java:282) at org.drools.base.ClassFieldAccessorCache.getClassObjectType(ClassFieldAccessorCache.java:206) at org.drools.base.ClassFieldAccessorStore.merge(ClassFieldAccessorStore.java:309) at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:463) at org.drools.reteoo.ReteooRuleBase.addPackage(ReteooRuleBase.java:381) at org.drools.eclipse.editors.rete.ReteViewer.getRuleBase(ReteViewer.java:115) at org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:145) at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121) java.lang.reflect.InvocationTargetException at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:251) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121) Caused by: java.lang.Exception: Unable to parse rules to show RETE view! at org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:147) at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244) ... 1 more Root exception: java.lang.Exception: Unable to parse rules to show RETE view! at org.drools.eclipse.editors.rete.ReteViewer.loadReteModel(ReteViewer.java:147) at org.drools.eclipse.editors.DRLRuleEditor2$3.run(DRLRuleEditor2.java:244) at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:121) _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Anil 2008-12-02T09:53:28 http://comments.gmane.org/gmane.comp.java.drools.user/13125 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Trägenap 2008-12-02T06:51:17 http://comments.gmane.org/gmane.comp.java.drools.user/13124 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Vithal Kuchibhotla 2008-12-02T06:11:58 http://comments.gmane.org/gmane.comp.java.drools.user/13121 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Vithal Kuchibhotla 2008-12-02T05:28:43 http://comments.gmane.org/gmane.comp.java.drools.user/13120 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Vithal Kuchibhotla 2008-12-02T05:20:26 http://comments.gmane.org/gmane.comp.java.drools.user/13119 I need to convert a variable from string to intger in the rule. That variable here is rank, so, I create a helper class called 'Conversion' with just one function/method, which is supposed to convert the string argument passed to it, to an integer and then I call that method in rule as inline eval. What's wrong here because this is not working and I don't want to change 'When' part too much because it has 10 or so other variable with && connective, which I've removed for clarity here. Any input would be appreciated much. package harules; import com.hibernate.Person; import com.uhg.utils.Conversion; rule "one" salience 10 when $con: Conversion(); pers: Person(age!= null , age >= 18 , eval($con.getInteger(rank) > 140)) then System.out.println("Evaluated true"); end //content of Conversion class package com.utils; public class Conversion { public Integer getInteger(String s) { return Integer.parseInt(s); } } vanshi 2008-12-02T05:08:50 http://comments.gmane.org/gmane.comp.java.drools.user/13117 I am using drools 4.0.7 plug in with eclipse 3.4.1. I created a drools project with the example generated by the wizard. However I am getting this exception when trying to run the example. I see there are discussion around this topic but I still do not have clear understand what the final solution should be. Does anyone have final solution? thanks Xiandong org.drools.RuntimeDroolsException: Unable to load dialect 'org.drools.rule.builder.dialect.java.JavaDialectConfiguration:java' at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:160) at org.drools.compiler.PackageBuilderConfiguration.buildDialectConfigurationMap(PackageBuilderConfiguration.java:146) at org.drools.compiler.PackageBuilderConfiguration.init(PackageBuilderConfiguration.java:121) at org.drools.compiler.PackageBuilderConfiguration.<init>(PackageBuilderConfiguration.java:98) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:124) at org.drools.compiler.PackageBuilder.<init>(PackageBuilder.java:86) at com.sample.DroolsTest.readRule(DroolsTest.java:50) at com.sample.DroolsTest.main(DroolsTest.java:21) Caused by: java.lang.RuntimeException: The Eclipse JDT Core jar is not in the classpath at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.setCompiler(JavaDialectConfiguration.java:91) at org.drools.rule.builder.dialect.java.JavaDialectConfiguration.init(JavaDialectConfiguration.java:52) at org.drools.compiler.PackageBuilderConfiguration.addDialect(PackageBuilderConfiguration.java:156) ... 7 more --------------------------------------------------------------------- To unsubscribe from this list, please visit: http://xircles.codehaus.org/manage_email Xiandong Su 2008-12-02T04:18:18 http://comments.gmane.org/gmane.comp.java.drools.user/13116 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Evans, Jess 2008-12-02T03:05:59 http://comments.gmane.org/gmane.comp.java.drools.user/13114 _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users Michal Bali 2008-12-02T00:24:44 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 least with my flow) as a NullPointerException giving absolutely no indication as to the root of the problems, which I am assuming are these parser errors. Seems to me that these errors should be returned with a call to packageBuilder.hasErrors() which is empty in my case. 3) Code assist doesnt appear to work in action editor or constraint editor which is I think is a pretty big usablity issue. Anything planned to make this available? Thanks 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 :-) _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users 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 :-) _______________________________________________ rules-users mailing list rules-users< at >lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users 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 patient has mild hypoglycemia (serum glucose is " + decision.getSerumGlucoseConcentration() +" mg/dL)."); end [/code] Here is the same rule using the second approach: [code] rule "Detect mild hypoglycemia" when decision : GlucoseDecision( serumGlucoseConcentration < 80, serumGlucoseConcentration >= 60 ) currentGlucoseBelowRange() not(mildHypoglycemia()) then insert(new mildHypoglycemia()); decision.explain("The patient has mild hypoglycemia (serum glucose is " + decision.getSerumGlucoseConcentration() +" mg/dL)."); end [/code] My question is whether one or the other of these approaches is a better practice? Using facts would make my rules trace more sensible, I think, but perhaps it is much less efficient. Comments are appreciated. Thank you. - Mike Mike Dean 2008-11-28T23:47:31 Search the mailing list at Gmane query http://search.gmane.org/?group=$group=gmane.comp.java.drools.user