December 2011 - rules-users - Jboss List Archives

by Java Bean

Hello Droolers, Here is my Scenario: public class Parties { protected List<Party> party; .... } public class Party { protected IdentificationGroup idGroup; } public class IdentificationGroup { protected String partyType; } I have a collection of "Party" objects in the statefulsession. I want to find in the collection whether there is a partyType of "SELLER" . In Object Graph notation it will be something like Parites[0].idGroup.partyType is "SELLER". If not found execute the consequence. Your help is very much appreciated.

14 years, 3 months

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Stateless session in drools server keeping classes around?

by dunnlow

Hi, I'm using drolls 5.3 server with one rule in a _stateless_ session. I am sending a POJO to the server, having it check a few attributes, modify the attributes of the bean as needed then return the result. I have this working and get back an execution results object like I need. The problem is that when I send the batch execution command to the server a number of classes stick around with each call (as shown in jconsole). Memory grows with each call until I run out. (I see garbage collection taking place so that doesnt seem to be the problem - and if I stop sending events to the server, the memory is never returned). I figured with a stateless session I wouldnt need to worry about this, anyone have thoughts about why this is happening? I am trying to do this quickly, and don't want to call dispose/retract (the whole reason I'm using stateless). knowledge-services.xml: <drools:ksession id="ksession1" type="stateless" kbase="kbase1" node="node1"/> my code that builds the command: list cmds = new arraylist InsertObjectCommand icmd = CommandFactory.newInsert(myBean) icmd.setOutIdentifier("inserter") icmd.setEntryPoint("DEFAULT") cmds.add(icmd) FileAllRulesCommand farc = new FileAllRulesCommand() cmds.add(fileAllRulesCommand) BatchExecutionCommand command = CommandFactory.newBatchExecution(cmds,"ksession1") .. As an aside, I also looked into setting the sequential mode to true to see if that helps, but am still trying to figure out how to configure that via Spring. Thanks for any insight, -j -- View this message in context: http://drools.46999.n3.nabble.com/Stateless-session-in-drools-server-keep... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

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Drools 4.0.7 - Serialization of Rules and Facts

by Ryan

I've inherited a rule engine implementation based on Drools 4.0.7 in which we're seeing a portion of rules failing to fire after we serialize then deserialize rules and facts across the restart of our application server. Here is our current implementation: serialization =========== 1. All facts are persisted to database tables from Events received via an implementation of WorkingMemoryEventListener 2. All Rules are persisted to database tables as a collection of rule "arguments" deserialization ============ after an app server restart, a new RuleBase is created, and RuleBase.newStatefulSession() is called 1. Rule "arguments" from db table are passed to an in-memory process that writes a plain text DRL file 2. DRL string is built to a Package, then installed as a new rule within the RuleBase 3. each individual fact is loaded from db table and inserted into the newly created working memory (StatefulSession) I do not believe this is a valid way of de/serialization. Reading the tests that ship with Drools 4.0.7, as well as the documentation, it seems the proper way is to use Java object serialization with both the RuleBase and WorkingMemory - is that correct? Assuming that my current serialization is incorrect, I'm investigating how best to repopulate the newly created RuleBase and working memory so that rules reliably fire. What I am seeing is that rules do not fire in a non-deterministic fashion after repopulating the new working memory as described above. Are there any suggestions for other paths to attempt? Thanks in advance for any help, Ryan

14 years, 3 months

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Can Drools supply large Knowledge Base?

by WangRamon

Hi All I'm new to Drools, I will build a very large Knowledge Base, let's say it will be larger than 100GB, the files will be stored in a distribute database, so can Droools supply this large Knowledge Base? Any solution? Thank you very much. CheersRamon

14 years, 3 months

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Error using drools.net for web application

by rulesengine.eval

I have seen a few posts on this, but nothing that seems to solve it. I have used drools.net working successfully locally in a windows app with the following code: PackageBuilder builder = new PackageBuilder(); Stream stream = Assembly.GetExecutingAssembly().GetManifestResourceStream("MinimalDroolsForm.SimpleRules.drl"); builder.AddPackageFromDrl("MinimalDroolsForm.SimpleRules.drl", stream); Package pkg = builder.GetPackage(); ruleBase = RuleBaseFactory.NewRuleBase(); ruleBase.AddPackage(pkg); workingMemory = ruleBase.NewWorkingMemory(); workingObj = new CustomerRecord(); etc. However, when I try something similar in a web app, I get the following error at builder.AddPackageFromDrl("DroolsApp.SimpleRules.drl", stream); : "The invoked member is not supported in a dynamic assembly" I am using all of the following assemblies: 1) drools-3.0 2) drools-dep 3) drools.dotnet 4) IKVM.GNU.Classpath 5) IKVM.Runtime Additionally, My rule is very simple: package DroolsApp rule "OldCustomer" when cust : CustomerRecord( DaysSinceLastOrder > 90, Status != "Re-Active" ) then true; end I am targeting the .NET Framework 4, and running on Windows7, under IIS7. Please let me know if you need any additional information. Thank you. -- View this message in context: http://drools.46999.n3.nabble.com/Error-using-drools-net-for-web-applicat... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

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5.3.0.Final throws RuntimeDroolsException: Unable to merge resource attribute for type declaration

by Green, John M (HP Software)

I'm not very experienced with Drools but have some Java code that dynamically loads/unloads rules from a KnowledgeBase. It worked with 5.2 but now throws the following exception with 5.3 org.drools.RuntimeDroolsException: Unable to merge resource attribute for type declaration of class: 'NormalizedEvent' at org.drools.common.AbstractRuleBase.mergeLeft(AbstractRuleBase.java:642) at org.drools.common.AbstractRuleBase.mergeTypeDeclarations(AbstractRuleBase.java:608) at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:537) at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:458) at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150) at com.hp.mon.processor.KnowledgeSessionFactory.addRules(KnowledgeSessionFactory.java:181) at com.hp.mon.processor.RuleRunner.runRules(RuleRunner.java:54) at com.hp.mon.processor.RulesTest.test(RulesTest.java:57) at com.hp.mon.processor.RulesTest.testSiteScopeSNMPRules(RulesTest.java:85) 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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184) at org.junit.runners.ParentRunner.run(ParentRunner.java:236) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) I have three .drl files. The first is "globals.drl" that simply imports and defines some global variables (e.g, a org.slf4j.Logger, etc.). This globals.drl file also defines NormalizedEvent as follows: declare NormalizedEvent @role( event ) end The second rules file (defaultRules.drl) contains default rules for aging out old / stale events. The third rules file has rules additional rules that are specific to a policy being dynamically deployed to our application. The compilation and loading process treats "globals.drl" as common "header" file. That is, rules files are pre-pended with globals.drl before they are compiled. For example: String globals = readDrlfile("globals.drl"); String newRules = readDrlfile("rulesToAdd.drl"); knowledgeBuilder.add(ResourceFactory.newReaderResource(new StringReader(globals + newRules))); if (knowledgeBuilder.hasErrors()) { throw exception ... } // No exception so compile succeeded --- BTW, it's using JANINO knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages()); // ERROR The first compile and load (globals.drl + defaultRules.drl) succeeds but I get this exception when I try to compile and load an additional file (globals.drl + additionalRules.drl). This code was also written by someone not very familar with Drools but it was working in 5.2 and now I need to get it working with 5.3 Looks like there were some significant code changes to AbstractRuleBase between these two releases. Any thoughts or suggestion here would be greatly appreciated.

14 years, 3 months

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Problems with Domain Specific Language in eclipse

by Ronald Albury

I am just trying to learn DSL and have immediately run into issues. I have a simple DSL in the file named XEasyApp.dsl : *[condition][]{value} is an invalid Boolean={value} not in("T","t","1","F","f","0")* and then a simple DSLR in the file named Test.dslr: * package com.onfs.easyapp.rules import com.onfs.easyapp.EasyApp expander XEasyApp.dsl rule "EasyApp Insured is Citizen Validation" when $ea : EasyApp(priIns_eaInsuredIsCitizenInd is an invalid Boolean) then $ea.addError(drools.getRule().getName()); end* I get the expected expansion in the DRL Viewer: package com.onfs.easyapp.rules import com.onfs.easyapp.EasyApp rule "EasyApp Insured is Citizen Validation" when $ea : EasyApp(priIns_eaInsuredIsCitizenInd not in("T","t","1","F","f","0")) then $ea.addError(drools.getRule().getName()); end There are no Red X's when I view Test.dslr in the editor, however a problem shows up in the Problems area below: *Description Resource Path Location Type [13] Unable to expand: $ea.addError(drools.getRule().getName()); Test.dslr /TermXpressRules/src/main/rules Unknown Drools Error*

14 years, 3 months

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Many to many matching rules implementation in Drools

by Milanello1998

Folks, I am recently working on a BI project which is doing reconciliation between repository and accounting. I'm using Drools 5.1.1 to maintain all these matching rules. One scenario i have no clue to implement in Drools is that I need to find x transactions from repository, to match y transactions from accounting, while existing repository transactions and accounting transactions are bigger than x and y. Does anybody have experience to do similar thing in Drools? Best Abe -- View this message in context: http://drools.46999.n3.nabble.com/Many-to-many-matching-rules-implementat... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

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Listing all packages present in gunvor repository

by srinivasasanda

Hi, *Listing Packages* KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kbuilder1.getKnowledgePackages()); kbase.addKnowledgePackages(kbuilder2.getKnowledgePackages()); int flag=1; for(KnowledgePackage kp :kbase.getKnowledgePackages()) { System.out.println("Package Names are"+kp.getName()); } The code which i had written here can possible to retrieves the list of packages.Here,I added snapshots to kbuilder1,kbuilder2 and through kbase iam retrieving the packages list.Is it is possible to retrieve list of packages without adding package snapshots to kbuilder.???It means i think through repository.xml...How can i achieve that??? Even i referred REST API but unable to retrieve XML nodes from it -- View this message in context: http://drools.46999.n3.nabble.com/Listing-all-packages-present-in-gunvor-... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

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How Add all packages to KnowledgeBuilder.add(drl or pkg or xsd,..);

by srinivasasanda

Hi All, Thanks in Advance to one and all, U have helped me lot , Please can give me some idea to resolve from this senario.. we are giving (package created in guvnor) as newUrlResource(url,type) to add to kbuilder, ... I have some 100 of packages how can i add all the packages to kbuilder... but by using rest api - http://localhost:8080/guvnor-5.2.0.Final-jboss-as-5.1/rest/packages (if i give this url in browser) i am able to see all the packages.. can i add the all packages with out hot coding the each and every package to kbuilder.add(url,type); KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); String url="http://localhost:8080/guvnor-5.2.0.Final-jboss-as-5.1/org.drools.guvnor.G..."; kbuilder.add(ResourceFactory.newUrlResource(url), ResourceType.PKG); -- View this message in context: http://drools.46999.n3.nabble.com/How-Add-all-packages-to-KnowledgeBuilde... Sent from the Drools: User forum mailing list archive at Nabble.com.

14 years, 3 months

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rules-users December 2011