January 2012 - rules-users - Jboss List Archives

by Stephen Masters

Hi folks, I quite like the clean separation provided by maintaining a declarative fact model rather than a Java model. In particular to me, it seems to make it easier to manage rules in Guvnor separate from my runtime environment. However I can also see how maintaining a Java model simplifies some activities, avoiding having to map between and external Java model and an internal representation, and making it easy to modify facts from within a knowledge session. Is there anybody out there who has experience doing a number of projects both ways, and has developed an opinion on whether one is preferable the other? Or is there perhaps more of a decision tree pertaining to which is better in particular situations? And on a side-note, is there anything out there that helps with mapping between Java beans and declarative facts? I was wondering about hacking up some AOP aspects to enable me to annotate a Java model in a slightly JPA/ORM style to help with mapping/marshalling between the two. Thanks for any thoughts. Steve stephen.masters(a)me.com

14 years, 3 months

6
7
0 / 0

Fusion historical data analysis

by MartinSimo

Dear drools Users I'd like to evaluate drools for our next project, thus a newbie. Trying to write a rule, which hits, if a threshold is reached 3 times in 100 seconds. having: kpi1 -- representing the timestamp of the event (as data are read from DB) and kpi2 where the actual value is. having rule: ... @expires( 200s ) @timestamp( kpi1 ) ... $arrayList : ArrayList( size > 3) from collect( LogEntry ( $kpi2 : kpi2 > 0.10) over window:time( 100s ) ) I have a test set of kpi2 20x each 5s over 0.1 and then 50x each 5s below 0.1. The first time the rule hits its correct (after the first 3 ticks kpi2>0.1) but it continues to hit till the end of the test set, even if the 100s window didn't have any>0.1. As I understood the @expires should have wiped the old data out of the working mem. (tried to set @expire( 2s), but with same result) Do I miss something? Deployed in Jboss 5.1.0ga ESB 4.10, drools 5.2.0) any help is appreciated Martin -- View this message in context: http://drools.46999.n3.nabble.com/Fusion-historical-data-analysis-tp36735... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

2
5
0 / 0

FireAllRules for all agenda

by Vis

Hi, We are having huge set of rules categoried into different agends, based on different functional behavior. And session.fireAllRule works fine with respect to an agend. But there is one more scenario where we need to fire all the rules irrespective of any agenda group, even main agend also. 1. Does Drools provide any such API call like fireAllRules where all rules can be fired irrespective of agenda? 2. If not, what is work around? Thanks in adavance. Thanks, V -- View this message in context: http://drools.46999.n3.nabble.com/FireAllRules-for-all-agenda-tp3674638p3... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

3
5
0 / 0

Infinit loop in simple example

by roland.kofler

Simple example loops ad infinitum if executed: package spikes; import org.springframework.roo.addon.javabean.RooJavaBean; @RooJavaBean public class Applicant { private final String string; private final int age; public boolean valid=true; public Applicant(String string, int i) { this.string = string; this.age = i; } } DroolsSpikeTest package spikes; import static org.junit.Assert.*; import org.drools.KnowledgeBase; import org.drools.runtime.StatelessKnowledgeSession; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations={"classpath:**/applicationContext-drools.xml"}) public class DroolsSpikeTest { @Autowired private KnowledgeBase kbase; @Test public void testspikeDroolRule() { StatelessKnowledgeSession ksession = kbase.newStatelessKnowledgeSession(); Applicant a = new Applicant("Mr John Smith", 16); assertTrue(a.isValid()); ksession.execute(a); assertFalse(a.isValid()); } } applicationContext-drools.xml <?xml version="1.0" encoding="UTF-8" standalone="no"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context" xmlns:jee="http://www.springframework.org/schema/jee" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:drools="http://drools.org/schema/drools-spring" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd http://drools.org/schema/drools-spring http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-containe..."> <drools:kbase id="kbase1"> <drools:resources> <drools:resource id="licenseRule" type="DRL" source="classpath:spikes/licenseApplication.drl"/> </drools:resources> <drools:configuration> <drools:mbeans enabled="true" /> </drools:configuration> </drools:kbase> <drools:ksession kbase="kbase1" type="stateless" id="ksessionStateless" name="stateless1" > </drools:ksession> </beans> licenseApplication.drl import spikes.Applicant rule "Is of valid age" when $a : Applicant( age < 18 ) then modify( $a ) { valid = false }; end -- View this message in context: http://drools.46999.n3.nabble.com/Infinit-loop-in-simple-example-tp367553... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

3
2
0 / 0

Can we set a default value for emlpty cells in Drools templates

by swaroop

Hi, I am trying to write a template and came across a scenario where one of the condition cell $a : Company(condition), When condition is left blank then entire predicate is missed and iam using the ref of the company obj $a to set some values which is failing as the declaration part is missing, So i was thinking, if we can have a default value to the cell as $a : Company(), then the scenario will be handled.Kindly let me know how to implement the default value for a cell in template to overcome the above mentioned scenario Thanks Swaroop -- View this message in context: http://drools.46999.n3.nabble.com/Can-we-set-a-default-value-for-emlpty-c... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

3
2
0 / 0

ClassCastException when KnowledgeAgent loads declared type

by lhorton

Code level: 5.2.0.Final I have a DRL file that includes a declared type: package com.abclegal.rules.servicerequirements declare TransgressionMetaData attempt : ServiceAttempt requirement : Requirement end The package loads the first time and its rules run without error. If I make a change to the file and hot-deploy it (copy it to the server), the ResourceChangeScanner picks up the file and KnowledgeAgent loads it, but when any rule from that package subsequently fires, I get a ClassCastException on the declared type: com.abclegal.rules.servicerequirements.TransgressionMetaData cannot be cast to com.abclegal.rules.servicerequirements.TransgressionMetaData it appears the KnowledgeAgent is not replacing the existing (in working memory) definition of the declared type, but instead is creating a new one with a different hash code. looks like a bug? Full stack trace: Caused by: RulesConsequenceException executing consequence for rule "PHOTO_WHEN_SERVED: Photo must be taken if served." in com.abclegal.rules.servicerequirements [Error: drools.insert(new TransgressionMetaData($attempt,$req)): com.abclegal.rules.servicerequirements.TransgressionMetaData cannot be cast to com.abclegal.rules.servicerequirements.TransgressionMetaData] [Near : {... @Modify with($attempt){ ....}] ^ [Line: 1, Column: 1] java.lang.ClassCastException: com.abclegal.rules.servicerequirements.TransgressionMetaData cannot be cast to com.abclegal.rules.servicerequirements.TransgressionMetaData Rules working memory: Fact ServiceAttempt id: 17 at com.abclegal.rules.utility.RulesConsequenceExceptionHandler.handleException(RulesConsequenceExceptionHandler.java:24) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:912) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:845) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1056) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:733) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:699) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218) at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:305) at com.abclegal.rules.server.RulesServiceImpl.execute(RulesServiceImpl.java:378) ... 44 more Caused by: [Error: drools.insert(new TransgressionMetaData($attempt,$req)): com.abclegal.rules.servicerequirements.TransgressionMetaData cannot be cast to com.abclegal.rules.servicerequirements.TransgressionMetaData] [Near : {... @Modify with($attempt){ ....}] ^ [Line: 1, Column: 1] at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:409) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.optimizeAccessor(ReflectiveAccessorOptimizer.java:140) at org.mvel2.optimizers.dynamic.DynamicOptimizer.optimizeAccessor(DynamicOptimizer.java:67) at org.mvel2.ast.ASTNode.optimize(ASTNode.java:154) at org.mvel2.ast.ASTNode.getReducedValueAccelerated(ASTNode.java:110) at org.mvel2.MVELRuntime.execute(MVELRuntime.java:86) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:122) at org.mvel2.compiler.CompiledExpression.getValue(CompiledExpression.java:115) at org.mvel2.MVEL.executeExpression(MVEL.java:928) at org.drools.base.mvel.MVELConsequence.evaluate(MVELConsequence.java:105) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:906) ... 51 more Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.getMethod(ReflectiveAccessorOptimizer.java:1066) at org.mvel2.optimizers.impl.refl.ReflectiveAccessorOptimizer.compileGetChain(ReflectiveAccessorOptimizer.java:338) ... 61 more -- View this message in context: http://drools.46999.n3.nabble.com/ClassCastException-when-KnowledgeAgent-... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

3
7
0 / 0

Upgrade Drools from 5.1 to 5.3

by womuji

Hi, We have a legacy Drools application using 5.1 and we are planning to upgrade to 5.3. I have several questions: 1. Are org.drools.StatelessSession and RuleBase deprecated? and instead we should use KnowledgeBase and StatelessKnowledgeSession? 2. In 5.1.1, we extend WorkingMemoryLogger(final WorkingMemoryEventManager workingMemoryEventManager) , but it's changed to WorkingMemoryLogger(final WorkingMemory workingMemory) in 5.3, how do we change accordingly? Thanks in advance. -- View this message in context: http://drools.46999.n3.nabble.com/Upgrade-Drools-from-5-1-to-5-3-tp367287... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

1
0
0 / 0

Groovy classes as fact classes in drool

by kavita

Hi, Can anybody tell me how to use groovy classes as fact classes in drools. When i try to upload the jar file generated from the groovy class am getting the following error: SEVERE: Servlet.service() for servlet AssetFileServlet threw exception java.lang.ClassNotFoundException: groovy.lang.GroovyObject at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:109) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(Unknown Source) at java.lang.ClassLoader.defineClass(Unknown Source) at org.drools.rule.MapBackedClassLoader.fastFindClass(MapBackedClassLoader.java:86) at org.drools.rule.MapBackedClassLoader.loadClass(MapBackedClassLoader.java:104) at java.lang.ClassLoader.loadClass(Unknown Source) at org.drools.guvnor.server.contenthandler.ModelContentHandler.isClassVisible(ModelContentHandler.java:183) at org.drools.guvnor.server.contenthandler.ModelContentHandler.getImportsFromJar(ModelContentHandler.java:148) at org.drools.guvnor.server.contenthandler.ModelContentHandler.onAttachmentAdded(ModelContentHandler.java:66) at org.drools.guvnor.server.files.FileManagerUtils.attachFileToAsset(FileManagerUtils.java:115) at org.drools.guvnor.server.files.FileManagerUtils.attachFile(FileManagerUtils.java:87) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.jboss.seam.util.Reflections.invoke(Reflections.java:22) at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.security.SecurityInterceptor.aroundInvoke(SecurityInterceptor.java:163) at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107) at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:185) at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:103) at org.drools.guvnor.server.files.FileManagerUtils_$$_javassist_seam_10.attachFile(FileManagerUtils_$$_javassist_seam_10.java) at org.drools.guvnor.server.files.AssetFileServlet.processAttachFileToAsset(AssetFileServlet.java:97) at org.drools.guvnor.server.files.AssetFileServlet.doPost(AssetFileServlet.java:49) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.jboss.seam.web.ContextFilter$1.process(ContextFilter.java:42) at org.jboss.seam.servlet.ContextualHttpServletRequest.run(ContextualHttpServletRequest.java:65) at org.jboss.seam.web.ContextFilter.doFilter(ContextFilter.java:37) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source) Please help. Thanks, Kavitha. -- View this message in context: http://drools.46999.n3.nabble.com/Groovy-classes-as-fact-classes-in-drool... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

2
1
0 / 0

java.lang.ClassCastException: java.lang.String cannot be cast to com.sample.DroolsTest$Message

by Veera

Hi All, Can anybody tell me what is the problem here .. i have a 2 classes: person(i have a field in this :java.lang.String add) Message(i have a filed in this :java.lang.String name) rule "H" when person( $a : add ) Message ( name == "tree" ) from $a then # System.out.println("in H rule"); when i compile this rule i am getting below exception... java.lang.ClassCastException: java.lang.String cannot be cast to com.sample.DroolsTest$Message Thanks in Advance.... Veeras -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-ClassCastException-java-lang-... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

3
2
0 / 0

How to combine drl files to one binary file

by Zhao Yi

I have some drl rule files in different packages. How can I combine them into one binary file? Thanks, Zhao Yi -- View this message in context: http://drools.46999.n3.nabble.com/How-to-combine-drl-files-to-one-binary-... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

2
1
0 / 0

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

rules-users January 2012