October 2012 - rules-users - Jboss List Archives

Re: [rules-users] StatefulKnowledgeSession and multi-threaded processing

by lhorton

You might like to view this video, posted by Mauricio (Salaboy) this year, from their Drools workshop in Argentina. It's about a real (production) implementation of a very high volume, high performance Drools-based system: http://vimeo.com/27209589 http://vimeo.com/27209589 -- View this message in context: http://drools.46999.n3.nabble.com/StatefulKnowledgeSession-and-multi-thre... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 6 months

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Re: [rules-users] Drools-Guvnor integration with Webshere- Exception during startup...Please help!!!

by Ravikiran

Drools Guvnor v5.3 & 5.4 onwards uses weld and seam frameworks causing this error. Though i do not have any clue about the given exception, But Guvnor v5.2.0 works perfectly in Websphere AS7 without any issues. But remember, it works only in Firefox browser. You'll end up ing seeing blank screen after login to Guvnor in IE browser. cheers -- View this message in context: http://drools.46999.n3.nabble.com/Drools-Guvnor-integration-with-Webshere... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

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How to write Hibernate query lang(HQL) in .DRL file

by zeeshan

Hi ! According to my requirement I need to fetch and Insert data from database using Hibernate Query from .DRL file. I have idea how to execute HQL in Plain Java class but according to my requirement,I need to fire query to database from .DRL file which I tried but unable to get output instead I was getting errors. Can anyone suggest me process to execute Hibernate Query from DRL file or please provide me some sample code or any link. Thanks !! -- View this message in context: http://drools.46999.n3.nabble.com/How-to-write-Hibernate-query-lang-HQL-i... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 7 months

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"Rule-Id" for a Drools Rule

by harishtejwani

All: We are using Drools to detect specific events/conditions in our system. In the 'then' condition of Drools rule, we would like to persist the "Rule Id" of the rule that created the specific event/condition This is because all our reporting is based on "rules" as filters, where users can look at exceptions by specific rules. Is there a suggestion or sample as how can the "Rule Id" be persisted or indicated in the then condition that is immutable or can be long-lived. The current approach of using Rule Name itself as the ID is brittle as this can be changed and suddenly all reports would break. If we assign ID's to rules, where do we keep the mapping of RULE ID to Rules. If we store rules in GUVRNOR is there a way we can get Rule Id's for Rules? Best regards Harish Tejwani -- View this message in context: http://drools.46999.n3.nabble.com/Rule-Id-for-a-Drools-Rule-tp2914385p291... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 8 months

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Multiple DSL files with Eclipse IDE

by gboro54

I would like to add more then one DSL file to a DSLR file. I understand that semantically the knowledge base will allow this but is there away to allow eclipse the ability to view the DRL when multiple DSLs are being used? I found JBRULES-1615 but I am not sure if this was actually resolved or just closed. Thanks -Mike -- View this message in context: http://drools.46999.n3.nabble.com/Multiple-DSL-files-with-Eclipse-IDE-tp4... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 9 months

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Compiled rules differ KnowledgeAgent vs ResourceChangeScanner

by lhorton

Version 5.2.0.Final. I have a DRL file that is loaded into my server using a change set and Spring configuration. The file loads without error, and I am able to read the compiled package and print the rule names to confirm they did load; however, only one of the rules fires. Then I copy (hot-deploy) the same DRL file to its server-side directory, and the Resource change Scanner picks it up and reloads it. After reload, all the expected rules execute. My guess is that the Spring/KnowledgeAgent compilation is different than the one done via the resource change scanner. Has anyone else seen this behavior? Any suggestions for further trouble shooting? I can attach the change set, spring config and drl file if needed. -- View this message in context: http://drools.46999.n3.nabble.com/Compiled-rules-differ-KnowledgeAgent-vs... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 10 months

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continuous integration of rule assets via jenkins to guvnor?

by Cedric Hurst

I'd like to get a quick sanity check on best practices... I'm working on a project where, by policy, all assets (including drl's, bpmn files, etc) must be built, tested and packaged by a Jenkins server. Rule assets are structured within a project that also includes non-rule assets. As is quite common, the primary system of record for these assets is an SCM like svn or git, and that's what our Jenkins box talks to. However, for the rule stuff specifically, we're also using Guvnor's drools-repository to package the assets into a knowledge base, which is referenced jBPM's process engine in the runtime. The plan is to have several Guvnor environments running with parity to development, QA, UAT and production setups. However, we're having a very hard time figuring out how best to sync our rule assets to these various repositories as part of an automated release. To the best of my understanding, rule assets are deployed to a Guvnor instance file-by-file via WebDAV. One can also upload JARs for POJOs, but DRLs, BPMN, DSL files need to be synced individually. Is this the case? And, if so, how do other groups handle continuous integration and deployment of assets coming from external SCMs? Btw, I came across aware of a Maven plugin which seems to do this sort of piece-by-piece deployment: https://github.com/awaterma/drools-guvnor-plugin So we could certainly port this sort of functionality to our own build toolchain, but it seems like a lot of work so I'm hoping for a better way. -- View this message in context: http://drools.46999.n3.nabble.com/continuous-integration-of-rule-assets-v... Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 10 months

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FW: Implementation of expert system

by Binyala, Krishna Gopal IN BLR SISL

Hello, I am new to drools community... I want to develop an expert system for medical application using drools. can you please let me know how to use history data in drools... Because as far as i know we have to keep all the data in the working memory to access. How should i implement such system? Would be better if you can provide some reference to existing expert system implemented using drools. Thanks in advance. Krishna Gopal In three words I can sum up everything I've learned about life: it goes on... Important notice:This e-mail and any attachment thereto contains corporate proprietary information. If you have received it by mistake, please notify us immediately by reply e-mail and delete this e-mail and its attachments from your system. Thank You.

11 years, 11 months

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Re: [rules-users] Question about Drools Spring, StatelessKnowledgeSession and globals

by Patrick van Kann

Hello fellow Droolers, A while ago I asked why the <drools:batch> element seemed to work differently in the case of a StatelessKnowledgeSession and a StatefulKnowedgeSession (see below). I just wanted to update those interested with the answer and ask some further questions, probably aimed at any developers who happen to be reading. I checked out the 5.1.1.34858 tag and had a look at how the Spring integration works. I found that the reason that the global is not set in the case of a StatelessKnowledgeSession is because the <spring:batch> element is effectively ignored in the StatelessKnowledgeSessionBeanFactory, which lacks the following code present in the StatefulKnowledgeSessionBeanFactory (in the internalAfterPropertiesSet() method): if ( getBatch() != null && !getBatch().isEmpty()) { for ( Command<?> cmd : getBatch() ) { ksession.execute( cmd ); } } So, either by accident or design the <spring:batch> element has no effect when using a StatelessKnowledgeSession (but is perfectly allowable in the XSD/Spring namespace). So my questions are: 1) Is this the intended behaviour or a bug? On reflection, I am now not sure the idea of a "batch/script" makes sense for a StatelessKnowledgeSession since execute() is a one-shot method and any globals set this way would not be available to later executions, which is what I was looking for. 2) If so, should the XSD be changed to disallow the batch element within a stateless session (difficult, given that this is determined via the "type" attribute) or should the documentation simply warn people that the <spring:batch> element doesn't do anything if you set the type attribute to stateless (somewhat confusing, I suppose) 3) If not, should the code above be added to the StatelessKnowledgeSessionBeanFactory.internalAfterPropertiesSet() method? 4) Should there be another way to declare a global that isn't through the batch element (one that would cause globals to be set via the setGlobal(String, Object) method rather than using the SetGlobalCommand via the execute() method. I am happy to try and contribute something along these lines if I can get some guidance as to what was actually intended. Hope this helps and thanks again for Drools. Patrick ===================================== Hello, I've been trying out the Spring integration package in Drools 5.1.1 and it works really well, but I have run into one issue I can't figure out. I've defined 2 knowledge sessions from the same knowledge base in the app context - one stateless, one stateful but otherwise identical. They both refer to a collaborator defined as a bean in the app context which is to be used as a global in my rules. This is just an excerpt of my full Spring context, the kbase definition itself is not an issue. <bean id="applicantDao" class="com.acme.app.dao.impl.ApplicantDaoImpl" /> <drools:ksession id="statelessKSession" type="stateless" name="statelessKSession" kbase="kbase"> <drools:batch> <drools:set-global identifier="applicantDao" ref="applicantDao" /> </drools:batch> </drools:ksession> <drools:ksession id="statefulKSession" type="stateful" name="statefulKSession" kbase="kbase"> <drools:batch> <drools:set-global identifier="applicantDao" ref="applicantDao" /> </drools:batch> </drools:ksession> The issue is that this configuration works for the stateful but not the stateless session, in the sense that the stateful session appears to have a valid reference to the applicantDao object in the Globals object but the stateless session doesn't. <at> Test public void testStatelessGlobal() { Globals globals = statelessKSession.getGlobals(); Object global = globals.get("applicantDao"); Assert.assertNotNull(global); } <at> Test public void testStatefulGlobal() { Globals globals = statefulKSession.getGlobals(); Object global = globals.get("applicantDao"); Assert.assertNotNull(global); } The first test fails (the global variable is null) but the second passes. No errors are thrown by Drools during the setup of the Spring container. What am I doing wrong? Should I be able to define globals in this way for stateless sessions? The XSD seems to indicate this is a valid configuration, but it just doesn't work. Is anyone else working with the Spring integration that can point out my error here? Many thanks, Patrick

11 years, 11 months

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Drools as a Webservice

by abhinavgupta

Hi, I am new to the Drools , i wanted to expose rules as a webservice using Axis2. what i have done is that 1. I have created a drools Project (working fine on eclispe) export all files in jar 2. Placed the jar file in C:\Program Files\Apache Software Foundation\Tomcat 7.0\webapps\axis2\WEB-INF\lib directory 3. Created a new Dynamic java project with axis2 facet.created a class with ** package in.abhi.ws; import java.math.BigDecimal; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseFactory; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderError; import org.drools.builder.KnowledgeBuilderErrors; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.builder.ResourceType; import org.drools.io.ResourceFactory; import org.drools.runtime.StatefulKnowledgeSession; import com.sample.SaleItem; public class Test { private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory .newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("KanasSalesTax.drl"), ResourceType.DRL); KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors.size() > 0) { for (KnowledgeBuilderError error : errors) { System.err.println(error); } throw new IllegalArgumentException("Could not parse knowledge."); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); return kbase; } public BigDecimal salesTax(String taxState, String typeItem) { BigDecimal taxCal = null; try { // load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase .newStatefulKnowledgeSession(); // Non-prescription item // Expect $1.89 for the tax SaleItem item1 = new SaleItem(); item1.setPurchaseState(taxState); item1.setItemType(typeItem); item1.setSalesPrice(new BigDecimal(29.95)); ksession.insert(item1); ksession.fireAllRules(); taxCal = item1.getSalesTax(); System.out.println(item1.getPurchaseState().toString() + " " + item1.getItemType().toString() + ": " + item1.getSalesTax().toString()); } catch (Throwable t) { t.printStackTrace(); } return taxCal; } } ** 4. Then created a bottom up java bean webservice of it using the same above class. 5. Wsdl is generated i am getting the error response on eclispe console while testing by soap-ui ********** java.lang.NullPointerException at org.drools.util.CompositeClassLoader.getResourceAsStream(CompositeClassLoader.java:122) at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:234) at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:215) at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createPackage(LookupEnvironment.java:748) at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:87) at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:167) at org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:721) at org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:381) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426) at org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:358) at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:369) at org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53) at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:71) at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:869) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:826) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:404) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:586) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37) at in.abhi.ws.Test.readKnowledgeBase(Test.java:31) at in.abhi.ws.Test.salesTax(Test.java:55) 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.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212) at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117) at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40) at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181) at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172) at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) java.lang.NullPointerException at org.drools.util.CompositeClassLoader.getResourceAsStream(CompositeClassLoader.java:122) at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:234) at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:215) at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createPackage(LookupEnvironment.java:748) at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.buildTypeBindings(CompilationUnitScope.java:87) at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.buildTypeBindings(LookupEnvironment.java:167) at org.eclipse.jdt.internal.compiler.Compiler.internalBeginToCompile(Compiler.java:721) at org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:381) at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426) at org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:358) at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49) at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:369) at org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:53) at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:71) at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:869) at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:826) at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:404) at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:586) at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:37) at in.abhi.ws.Test.readKnowledgeBase(Test.java:31) at in.abhi.ws.Test.salesTax(Test.java:55) 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.apache.axis2.rpc.receivers.RPCUtil.invokeServiceClass(RPCUtil.java:212) at org.apache.axis2.rpc.receivers.RPCMessageReceiver.invokeBusinessLogic(RPCMessageReceiver.java:117) at org.apache.axis2.receivers.AbstractInOutMessageReceiver.invokeBusinessLogic(AbstractInOutMessageReceiver.java:40) at org.apache.axis2.receivers.AbstractMessageReceiver.receive(AbstractMessageReceiver.java:110) at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181) at org.apache.axis2.transport.http.HTTPTransportUtils.processHTTPPostRequest(HTTPTransportUtils.java:172) at org.apache.axis2.transport.http.AxisServlet.doPost(AxisServlet.java:146) at javax.servlet.http.HttpServlet.service(HttpServlet.java:641) at javax.servlet.http.HttpServlet.service(HttpServlet.java:722) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:224) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) **************** Please let me know how to make it work -- View this message in context: http://drools.46999.n3.nabble.com/Drools-as-a-Webservice-tp3950198.html Sent from the Drools: User forum mailing list archive at Nabble.com.

11 years, 11 months

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rules-users October 2012