October 2011 - rules-users - Jboss List Archives

by tungl

Hello everyone, I think my problem is quite simple, but still, I can't come up with a solution. What I want to do is compare the last fact with the current one and I'm wondering how to do that. That's how I check if the EventType of the current Event is EVENT1. What I want to do now is check if the EventType of the current Event is EVENT1 and EventType of the previous Event is EVENT2. How can I do that? Thanks very much in advance, Martin -- View this message in context: http://drools.46999.n3.nabble.com/Get-previous-fact-from-working-memory-t... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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Cookbook: How to test rules using xUnit

by Edson Tirelli

Hi all, Not sure why the syntax highlighter is not working on the blog, but in any case, you can read the content. http://blog.athico.com/2011/10/cookbook-how-to-test-rules-using-xunit.html Hopefully it will be helpful to some people. Edson -- Edson Tirelli JBoss Drools Core Development JBoss by Red Hat @ www.jboss.com

14 years, 11 months

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IllegalStateException happens when ResourceChangeScanner working on Version 5.3.0.CR1

by Oliver Liu

Hi Guys, I want to upgrade drools from 5.1.1 to 5.3.0 CR1, but i found ResourceChangeScanner could't work. In version 5.1.1, i wrote this code to get a KnowledgeAgent KnowledgeAgent kagent = KnowledgeAgentFactory.newKnowledgeAgent("ReleaseAgent"); kagent.addEventListener(new ReloadingRuleEventListener(this)); kagent.applyChangeSet(ResourceFactory.newClassPathResource("changeset-url.xml")); changeset-url.xml content is like: <change-set xmlns='http://drools.org/drools-5.0/change-set' xmlns:xs='http://www.w3.org/2001/XMLSchema-instance' xs:schemaLocation='http://drools.org/drools-5.0/change-set http://anonsvn.jboss.org/repos/labs/labs/jbossrules/trunk/drools-api/src/...' > <add> <resource source='http://hostname:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/Packa...' type='PKG' basicAuthentication="enabled" username="user1" password="123456" /> <resource source='http://hostname:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/Packa...' type='PKG' basicAuthentication="enabled" username="user1" password="123456" /> <resource source='http://hostname:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/Packa...' type='PKG' basicAuthentication="enabled" username="user1" password="123456" /> </add> </change-set> then wrote this code to scan if there is a new version snapshot on guvnor ResourceChangeScannerConfiguration sconf = ResourceFactory .getResourceChangeScannerService() .newResourceChangeScannerConfiguration(); sconf.setProperty("drools.resource.scanner.interval","60"); ResourceFactory.getResourceChangeScannerService().configure(sconf); ResourceFactory.getResourceChangeScannerService().start(); ResourceFactory.getResourceChangeNotifierService().start(); It works very well, each time when ResourceChangeScanner finding there is new snapshot, it can reload the rules from guvnor properly. But when i updated to 5.3.0 CR1, ran this code, error happens: Exception in thread "Thread-2" java.lang.IllegalStateException: reader does have a modified date at org.drools.io.impl.ReaderResource.getLastModified(ReaderResource.java :64) at org.drools.io.impl.ResourceChangeScannerImpl.scan(ResourceChangeScann erImpl.java:169) at org.drools.io.impl.ResourceChangeScannerImpl$ProcessChangeSet.run(Res ourceChangeScannerImpl.java:326) at java.lang.Thread.run(Thread.java:619) It seems in new version, UrlResource was parsed to ReaderResource(i rememer in 5.1.1, each resource in changeset-url.xml was parsed to UrlResource). Can you give a help? Thanks a lot -- View this message in context: http://drools.46999.n3.nabble.com/IllegalStateException-happens-when-Reso... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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5.3.0 CR1 has broken existing rules/flows

by Jamie

I recently upgraded from 5.2.0 Final to 5.3.0 CR1 because I was experiencing memory leaks in 5.2.0 Final due to a known bug that was fixed in 5.3.0 CR1. I have a suite of FitNesse tests that exercise the majority of my rules and flows, and I can demonstrate that the memory leak is indeed fixed, but one of my tests is now failing. If I revert back to 5.2.0 Final, all is well. I've been trying to determine the root cause for the past 3 days, but I'm not getting anywhere. I suspect that it's related to an interaction between 2 rules, e.g. one rule modifies something that causes the second rule to fire, but the second rule chokes in the consequence when it tries to execute a modify() statement. If I comment out the modify portion, the rule fires fine. I wish I could provide an example, but my implementation is too complex for that and I haven't been able to reproduce it in a stand-alone example. I know a stack trace probably won't tell you much, but I've included it below just in case. If anyone has any ideas, I'd love to hear them. If there's any additional information you think might help diagnose the problem, I'd be happy to provide it. Thanks, Jamie org.drools.runtime.rule.ConsequenceException: rule: Rule 022 - Load Buyer Activity at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101) at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029) at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:708) at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:672) at org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218) at com.llbean.fraud.rule.engine.DroolsRulesEngine.invokeRules(DroolsRulesEngine.java:119) at com.llbean.fraud.rule.engine.DroolsRulesEngine.invokeRules(DroolsRulesEngine.java:81) at com.llbean.fraud.fitnesse.fixtures.tests.TestFraudRules.execute(TestFraudRules.java:116) at fit.ColumnFixture.executeIfNeeded(ColumnFixture.java:57) at fit.ColumnFixture.check(ColumnFixture.java:46) at fit.Binding$QueryBinding.doCell(Binding.java:188) at fit.ColumnFixture.doCell(ColumnFixture.java:37) at fit.Fixture.doCells(Fixture.java:171) at fit.Fixture.doRow(Fixture.java:165) at fit.ColumnFixture.doRow(ColumnFixture.java:25) at fit.Fixture.doRows(Fixture.java:159) at fit.ColumnFixture.doRows(ColumnFixture.java:18) at fit.Fixture.doTable(Fixture.java:153) at fit.Fixture.interpretFollowingTables(Fixture.java:119) at fit.Fixture.interpretTables(Fixture.java:105) at fit.Fixture.doTables(Fixture.java:79) at com.llbean.test.fitnesse.servletrunner.server.LLBFitServer.process(LLBFitServer.java:120) at com.llbean.test.fitnesse.servletrunner.server.LLBFitServer.runTests(LLBFitServer.java:40) at com.llbean.test.fitnesse.servletrunner.servlet.FitServlet.service(FitServlet.java:32) at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1530) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:829) at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:458) at com.ibm.ws.webcontainer.servlet.ServletWrapperImpl.handleRequest(ServletWrapperImpl.java:175) at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:91) at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:862) at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1583) at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:178) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:455) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewInformation(HttpInboundLink.java:384) at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:272) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214) at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113) at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:165) at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217) at com.ibm.io.async.AsyncChannelFuture.fireCompletionActions(AsyncChannelFuture.java:161) at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:138) at com.ibm.io.async.ResultHandler.complete(ResultHandler.java:204) at com.ibm.io.async.ResultHandler.runEventProcessingLoop(ResultHandler.java:775) at com.ibm.io.async.ResultHandler$2.run(ResultHandler.java:905) at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1550) Caused by: java.lang.NullPointerException at org.drools.reteoo.RuleTerminalNode.createActivations(RuleTerminalNode.java:276) at org.drools.reteoo.RuleTerminalNode.modifyLeftTuple(RuleTerminalNode.java:326) at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateModifyChildLeftTuple(SingleLeftTupleSinkAdapter.java:273) at org.drools.reteoo.EvalConditionNode.modifyLeftTuple(EvalConditionNode.java:234) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateModifyChildLeftTuple(CompositeLeftTupleSinkAdapter.java:295) at org.drools.reteoo.JoinNode.modifyLeftTuple(JoinNode.java:380) at org.drools.reteoo.BetaNode.modifyLeftTuple(BetaNode.java:450) at org.drools.reteoo.JoinNode.modifyLeftTuple(JoinNode.java:446) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.doPropagateModifyObject(CompositeLeftTupleSinkAdapter.java:260) at org.drools.reteoo.CompositeLeftTupleSinkAdapter.propagateModifyObject(CompositeLeftTupleSinkAdapter.java:275) at org.drools.reteoo.LeftInputAdapterNode.modifyObject(LeftInputAdapterNode.java:174) at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateModifyObject(CompositeObjectSinkAdapter.java:461) at org.drools.reteoo.CompositeObjectSinkAdapter.propagateModifyObject(CompositeObjectSinkAdapter.java:429) at org.drools.reteoo.ObjectTypeNode.modifyObject(ObjectTypeNode.java:277) at org.drools.reteoo.EntryPointNode.modifyObject(EntryPointNode.java:271) at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:459) at org.drools.common.NamedEntryPoint.update(NamedEntryPoint.java:363) at org.drools.base.DefaultKnowledgeHelper.update(DefaultKnowledgeHelper.java:298) at com.llbean.droolstest.Rule_Rule_022___Load_Buyer_Activity.defaultConsequence(Rule_Rule_022___Load_Buyer_Activity.java:15) at com.llbean.droolstest.Rule_Rule_022___Load_Buyer_ActivityDefaultConsequenceInvokerGenerated.evaluate(Unknown Source) at com.llbean.droolstest.Rule_Rule_022___Load_Buyer_ActivityDefaultConsequenceInvoker.evaluate(Unknown Source) at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091) ... 45 more -- View this message in context: http://drools.46999.n3.nabble.com/5-3-0-CR1-has-broken-existing-rules-flo... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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Re: [rules-users] Memory leak in 5.2/5.3

by indian9

I have couple of questions. 1. When do you force remove the facts from session? When you hit a wait state? 2. How do you recognize the end of execution of your flow? Thanks, -- View this message in context: http://drools.46999.n3.nabble.com/rules-users-Memory-leak-in-5-2-5-3-tp32... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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Problem with Java enums in Guvnor "multiple field constraints"?

by enkidu

I've been playing with Drools and Guvnor and think I've encountered a problem with Java enums in Guvnor. I've searched for previous enum bugs and seen that a lot have been fixed, but I've tried Guvnor 5.2.0 and 5.3.0.CR1 and it happens in both. The problem seems to happen when you use enums in a "multiple field constraint" on a fact, eg: There is a Person with: any of the following: role equal to Role.TEACHER role equal to Role.PARENT Then using "view source" to see the generated DRL, the enum values are enclosed in double quotes, ie: rule "test" dialect "mvel" when Person( role == "Role.TEACHER" || role == "Role.PARENT" ) then end If I just do a single field constraint then it comes out fine, eg. Person( role == Role.TEACHER ) Is this a bug or am I doing something stupid? I've seen posts recommending the use of string constants rather than enums - is this the workaround? Below is my simple Java model for completeness: public enum Role { TEACHER, STUDENT, PARENT } public class Person { private String name; private Role role; public Person( String name, Role role ) { this.name = name; this.role = role; } public String getName() { return name; } public Role getRole() { return role; } } -- View this message in context: http://drools.46999.n3.nabble.com/Problem-with-Java-enums-in-Guvnor-multi... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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Compilation errors with 5.3.0.CR1

by Wacław Borowiec

Hello I'm sending the message once again due to problems with code samples visibility in the previous one. I've got following rule: rule "enabled paramId: 1, id: 0" salience 50 when (def0: EmParamDefinition(paramName == "p2", listIndex == -1) and EmParamValue(paramDefinitionId == def0, requiredValue == 1)) $param : EmParamValue(id == 1, enabled == false) not ParentDisabled(id == 1) then $param.setEnabled(true); update($param); end It compiles fine under Drools 5.1.1, but after switching to 5.3.0.CR1 I get following exception: [Error: unexpected end of statement] [Near : {... def ....}] ^ [Line: 1, Column: 4] at org.mvel2.compiler.AbstractParser._captureBlock(AbstractParser.java:1470) at org.mvel2.compiler.AbstractParser.captureCodeBlock(AbstractParser.java:1446) at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:421) at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:128) at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62) at org.mvel2.MVEL.analysisCompile(MVEL.java:668) at org.mvel2.MVEL.analysisCompile(MVEL.java:672) at org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:854) at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:595) at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:397) at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:309) at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:132) at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65) at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:80) at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2241) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:802) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:388) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:566) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:35) at com.proximetry.elmgr.services.DependenciesBean$Expander.addDrl(DependenciesBean.java:110) It is (def0: EmParamDefinition(paramName == "p2", listIndex == -1) and EmParamValue(paramDefinitionId == def0, requiredValue == 1)) line that causes the problem - the exeption disappears after removing it. What's interesting, when I add '$' sign to binding variable name, and the line looks like: ($def0: EmParamDefinition(paramName == "p2", listIndex == -1) and EmParamValue(paramDefinitionId == $def0, requiredValue == 1)) instead of the exception I get DRL error: [DialectError message='Unable to wire compiled classes, probably related to compilation failures:sun.reflect.generics.reflectiveObjects.WildcardTypeImpl cannot be cast to java.lang.Class'] For completness, this is how I add DRL resources: public void addDrl(Reader rdr) { KnowledgeBuilder kBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kBuilder.add( ResourceFactory.newReaderResource(rdr), ResourceType.DRL); if( kBuilder.hasErrors() ){ for( KnowledgeBuilderError err: kBuilder.getErrors() ){ StackTrace.error(this, err); } throw new IllegalStateException( "DRL errors" ); } knowledgeBase.addKnowledgePackages( kBuilder.getKnowledgePackages() ); } I would be grateful if someone has an idea, why after switching Drools version such problem exists.

14 years, 11 months

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Collecting all items of nested collections / accumulate nested collections

by Claes, Kenny [JRDBE - Non J&J]

I have a question regarding creating a list of items that are all in nested collections of my main object. A high level overview of the model is like this: public Level0 { private List<Level1> level1List; } public Level1 { private List<Level2> level1List; } public Level2 { private Date occurence; } Now, I add objects of type 0 in the working memory and for each of those objects, I want to find the latest occurrence of a certain Level2, regardless of which level1 they belong to. If there's only 2 levels and I want to find the latest occurrence of Level2's with a certain name, I can write: rule "latest level 1" when $l0: Level0() $date: Date() from accumulate (Level1(name in ("name1", "name2"), $occurence: occurence) from $l0.level1List, maxDate($occurence)) then // register fact that latest occurrence of name1/name2 level1 was on $date end Now, with 3 levels, since I obviously can't replace $l0.level1List with $l0.level1List.level2List, is there a way to create an intermediate list that will contain all Level2 objects? No filtering needs to take place on Level1, but if there's a way to do that too, that would be nice. What I currently have is this: rule "latest level 2" when $l0: Level0() $l1: Level1() from $l1.level1List $l2List: List(size > 0) from collect( Level2(name in (("name1", "name2")) from $l1.level2List ) $date: PartialDate() from accumulate (Level2( $occurence: occurence) from $l2List, maxDate($occurence)) then // register fact that latest occurrence of name1/name2 level2 was on $date end But this does not work as it treats each Level1 seperately: it creates a "latest occurrence" for all accumulated level2 facts within a level1, instead of one for the entire set of level 2's 'owned' by the level0 object. Any suggestions?

14 years, 11 months

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Compilation errors with 5.3.0.CR1

by wyborowiec

Hello I've got following rule: It compiles fine under Drools 5.1.1, but after switching to 5.3.0.CR1 I get following exception: It is line that causes the problem - the exeption disappears after removing it. What's interesting, when I add '$' sign to binding variable name, and the line looks like: instead of the exception I get DRL error: For completness, this is how I add DRL resources: I would be grateful if someone has an idea, why after switching Drools version such problem exists. -- View this message in context: http://drools.46999.n3.nabble.com/Compilation-errors-with-5-3-0-CR1-tp339... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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Exception Handler not working in Drools flow(bpmn) but working fine in .rf

by rahulkrishnan

Hi, I have tried the fault node in drools flow file and it has worked fine in .rf. Whenever a faultnode is triggered it will search for the fault name and will be caught at the apropriate Exception Handlers. But When am implementing the same in .bpmn the fault node is triggered but the flow is not reaching Exception Handlers ie The flow will exit upon reaching the fault node. How can i resolve this problem? -- View this message in context: http://drools.46999.n3.nabble.com/Exception-Handler-not-working-in-Drools... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 11 months

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rules-users October 2011