June 2012 - rules-users - Jboss List Archives

Re: [rules-users] java.lang.ClassCastException: [Lorg.drools.rule.Package; cannot be cast to org.drools.rule.Package

by Manasi

Hi, I am also getting same error when trying to a call rule stored in guvnor. Following error I am getting: Exception in thread "main" java.lang.ClassCastException: [Lorg.drools.rule.Package; cannot be cast to org.drools.rule.Package at org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:82) at org.drools.agent.URLScanner.readPackage(URLScanner.java:171) at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:143) at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:119) at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:427) at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:379) at org.drools.agent.RuleAgent.configure(RuleAgent.java:364) at org.drools.agent.RuleAgent.init(RuleAgent.java:264) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:204) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:164) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:273) I am using Drools 5.4 version. The error is coming when trying to get the RuleAgent: RuleAgent agent = RuleAgent.newRuleAgent("/com/model/drools.properties"); drools.properties contains: url = http://localhost:8080/guvnor/org.drools.guvnor.Guvnor/package/FeltKnapRes... name=guvnorAgent enableBasicAuthentication=True username=admin password=admin FeltKnapRestriktionerKundeMedAnl is the package name I have created in guvnor ,and I want to call one of the rule in this package. Thanks, Manasi -- View this message in context: http://drools.46999.n3.nabble.com/java-lang-ClassCastException-Lorg-drool... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 7 months

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Fire Rule in Stateless Knowledge Session

by snehils

Hi, I am new in Drools. I am using Drools version 5.1.0 My requirement is kind of request response, where I have to perform some checks for the request and respond the result. Hence, I decided to go with stateless knowledge session. I have prepared .DRL file and it contains set of rules. When some request receives I have to identify the rule(s) belongs to that request and then fire the rule(s). I am not able to figure out how to categories the rules request wise in DRL file? Also, how to fire only those rules which belongs to the category. For example, there are three kinds of requests Rq1, Rq2 and Rq3. There are rules in DRL file: R1, R2, R3, R4 and R5. R1, R2 belongs to Rq1, R3 belongs to Rq2 and R4, R5 belongs to Rq3. When some request receives only its belonging rules should be fired. For example, on receiving of Rq2 only R3 should be fired. Please provide me some code snipped or link. Thanks -- View this message in context: http://drools.46999.n3.nabble.com/Fire-Rule-in-Stateless-Knowledge-Sessio... Sent from the Drools: User forum mailing list archive at Nabble.com.

12 years, 8 months

5
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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.

12 years, 9 months

8
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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.

12 years, 11 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.

13 years

2
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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.

13 years, 1 month

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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

13 years, 1 month

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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.

13 years, 1 month

3
2
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Drools 5.4.0.FINAL and OSGI. Unable to instantiate service for Class 'org.drools.concurrent.ExecutorProvider'

by Per Sterner

Hello, I have been using Drools 5.3.0.FINAL until now. I am upgrading my running system with 5.4.0.FINAL. The bundles are all runing. I got some error messages and tried to reduce the problem and created a simple bundle. The code only inserts facts and after 20 facts I get the following error: [ERROR] [System] - Exception in thread "Thread-8" java.lang.ExceptionInInitializerError [ERROR] [System] - at org.drools.concurrent.ExecutorProviderFactory.getExecutorProvider(ExecutorProviderFactory.java:12) [ERROR] [System] - at org.drools.rule.constraint.MvelConstraint$ExecutorHolder.<clinit>(MvelConstraint.java:208) [ERROR] [System] - at org.drools.rule.constraint.MvelConstraint.jitEvaluator(MvelConstraint.java:199) [ERROR] [System] - at org.drools.rule.constraint.MvelConstraint.evaluate(MvelConstraint.java:164) [ERROR] [System] - at org.drools.rule.constraint.MvelConstraint.isAllowed(MvelConstraint.java:124) [ERROR] [System] - at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137) [ERROR] [System] - at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59) [ERROR] [System] - at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235) [ERROR] [System] - at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240) [ERROR] [System] - at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:337) [ERROR] [System] - at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298) [ERROR] [System] - at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:123) [ERROR] [System] - at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:53) [ERROR] [System] - at de.pelle7.drools.test1.simpletest.SimpleTestDrools$1.run(SimpleTestDrools.java:74) [ERROR] [System] - Caused by: java.lang.IllegalArgumentException: Unable to instantiate service for Class 'org.drools.concurrent.ExecutorProvider' [ERROR] [System] - at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:162) [ERROR] [System] - at org.drools.concurrent.ExecutorProviderFactory$ExecutorProviderHolder.<clinit>(ExecutorProviderFactory.java:8) [ERROR] [System] - ... 14 more [ERROR] [System] - Caused by: java.lang.IllegalArgumentException: Unable to instantiate 'org.drools.concurrent.ExecutorProviderImpl' [ERROR] [System] - at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:213) [ERROR] [System] - at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.call(ServiceRegistryImpl.java:205) [ERROR] [System] - at org.drools.util.ServiceRegistryImpl.get(ServiceRegistryImpl.java:160) [ERROR] [System] - ... 15 more [ERROR] [System] - Caused by: java.lang.ClassNotFoundException: org.drools.concurrent.ExecutorProviderImpl [ERROR] [System] - at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:506) [ERROR] [System] - at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422) [ERROR] [System] - at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410) [ERROR] [System] - at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) [ERROR] [System] - at java.lang.ClassLoader.loadClass(Unknown Source) [ERROR] [System] - at java.lang.Class.forName0(Native Method) [ERROR] [System] - at java.lang.Class.forName(Unknown Source) [ERROR] [System] - at org.drools.util.ServiceRegistryImpl$ReflectionInstantiator.newInstance(ServiceRegistryImpl.java:210) [ERROR] [System] - ... 17 more The Rule file: package de.pelle7.drools.test1.users.rules.impl; import de.pelle7.drools.test1.simpletest.*; import org.jbpm.ruleflow.instance.*; rule "Funny Rule #1" dialect "java" when $testObject : TestObjectA( value == 0 ) from entry-point "my_entry" then System.err.println("New Item: " + $testObject); retract($testObject); end If I change the line --> $testObject : TestObjectA( value == 0 ) from entry-point "my_entry" to --> $testObject : TestObjectA( ) from entry-point "my_entry" there is no problem. In the java code i initialize a Drools Session programatically and add one rule file: package de.pelle7.drools.test1.simpletest; import java.io.InputStream; import java.net.URI; import java.net.URL; import java.util.Collection; import java.util.HashSet; import java.util.Iterator; import java.util.LinkedList; import java.util.List; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseConfiguration; import org.drools.KnowledgeBaseFactoryService; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderConfiguration; import org.drools.builder.KnowledgeBuilderFactoryService; import org.drools.builder.ResourceType; import org.drools.definition.KnowledgePackage; import org.drools.io.ResourceFactory; import org.drools.io.ResourceFactoryService; import org.drools.runtime.StatefulKnowledgeSession; import org.slf4j.Logger; import org.slf4j.LoggerFactory; public class SimpleTestDrools { public static final String DEFAULT_ENTRY = "my_entry"; private static Logger logger = LoggerFactory.getLogger(SimpleTestDrools.class); private StatefulKnowledgeSession droolsSession; private KnowledgeBuilderFactoryService droolsKnowledgeBuilderFactoryService; private ResourceFactoryService droolsResourceFactoryService; private KnowledgeBaseFactoryService droolsKnowledgeBaseFactoryService; public static Logger getLogger() { return logger; } public StatefulKnowledgeSession getDroolsSession() { return droolsSession; } public void start() { KnowledgeBuilder kbuilder = getDroolsKnowledgeBuilderFactoryService().newKnowledgeBuilder(); KnowledgeBaseConfiguration config = getDroolsKnowledgeBaseFactoryService().newKnowledgeBaseConfiguration(); //config.setOption( MBeansOption.ENABLED ); KnowledgeBase knowledgeBase = getDroolsKnowledgeBaseFactoryService().newKnowledgeBase(config); droolsSession = knowledgeBase.newStatefulKnowledgeSession(); LinkedList<URI> resourcesList = new LinkedList<URI>(); try { resourcesList.add( getClass().getResource("MyDrools.drl").toURI() ); addResources(droolsSession, getDroolsKnowledgeBuilderFactoryService(), resourcesList); } catch (Exception e) { e.printStackTrace(); } new Thread() { public void run() { try { Thread.sleep(5000); } catch (InterruptedException e) { } System.out.println("Go 1"); for (int i = 0; i< 1000; i++) { System.out.println(i); getDroolsSession().getWorkingMemoryEntryPoint(DEFAULT_ENTRY).insert(new TestObjectA()); getDroolsSession().fireAllRules(); try { Thread.sleep(1); } catch (InterruptedException e) { } } System.out.println("Go 2"); }; }.start(); System.err.println("wait"); //getDroolsSession().fireUntilHalt(); } public static void addResources( StatefulKnowledgeSession droolsSession, KnowledgeBuilderFactoryService droolsKnowledgeBuilderFactoryService, List<URI> resources ) throws MyDroolsException { getLogger().debug("Drools: Register: " + resources); MyDroolsException exception = null; KnowledgeBuilderConfiguration lnowledgeBuilderConfiguration = droolsKnowledgeBuilderFactoryService.newKnowledgeBuilderConfiguration(); HashSet<URI> defects = new HashSet<URI>(); KnowledgeBuilder kbuilder = null; while (true) { URI uriError = null; kbuilder = droolsKnowledgeBuilderFactoryService.newKnowledgeBuilder(lnowledgeBuilderConfiguration); try { Iterator<URI> it = resources.iterator(); while (it.hasNext()) { URI uri = (URI) it.next(); if (defects.contains(uri)) { continue; } StringBuilder builder = new StringBuilder(); builder.append("Adding drools file '" + uri.toString() + "'"); URL url = uri.toURL(); InputStream iStream = url.openStream(); ResourceType resourceType; String path = uri.getPath().toLowerCase(); resourceType = ResourceType.determineResourceType(path); getLogger().debug(builder.toString()); kbuilder.add(ResourceFactory.newInputStreamResource(iStream), resourceType); // Check the builder for errors if (kbuilder.hasErrors()) { uriError = uri; //getLogger().error(kbuilder.getErrors().toString()); String errorMessage = kbuilder.getErrors().toString(); kbuilder.getErrors().clear(); throw new MyDroolsException(errorMessage); } try { iStream.close(); } catch (Exception e) { e.printStackTrace(); } } } catch (Throwable e) { if (uriError != null) { defects.add(uriError); } String msg = "Error in Resource '" + uriError + "'"; getLogger().error(msg); e.printStackTrace(); if (exception != null) { exception = new MyDroolsException(msg, exception); } else { exception = new MyDroolsException(msg); } exception = new MyDroolsException(e.getMessage(), exception); continue; } // All done! break; } final Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages(); droolsSession.getKnowledgeBase().addKnowledgePackages(pkgs); if (exception != null) { throw new MyDroolsException("Error while adding resources!", exception); } } public KnowledgeBuilderFactoryService getDroolsKnowledgeBuilderFactoryService() { return droolsKnowledgeBuilderFactoryService; } public void setDroolsKnowledgeBuilderFactoryService( KnowledgeBuilderFactoryService droolsKnowledgeBuilderFactoryService) { this.droolsKnowledgeBuilderFactoryService = droolsKnowledgeBuilderFactoryService; } public ResourceFactoryService getDroolsResourceFactoryService() { return droolsResourceFactoryService; } public void setDroolsResourceFactoryService( ResourceFactoryService droolsResourceFactoryService) { this.droolsResourceFactoryService = droolsResourceFactoryService; } public KnowledgeBaseFactoryService getDroolsKnowledgeBaseFactoryService() { return droolsKnowledgeBaseFactoryService; } public void setDroolsKnowledgeBaseFactoryService( KnowledgeBaseFactoryService droolsKnowledgeBaseFactoryService) { this.droolsKnowledgeBaseFactoryService = droolsKnowledgeBaseFactoryService; } } Some of the bundles in my runtime are: 39 ACTIVE org.drools.core_5.4.0.Final 66 ACTIVE org.drools.compiler_5.4.0.Final 78 ACTIVE org.drools.templates_5.4.0.Final 94 ACTIVE org.drools.internalapi_5.4.0.Final 136 ACTIVE org.drools.decisiontables_5.4.0.Final 189 ACTIVE org.drools.api_5.4.0.Final 191 ACTIVE org.mvel2_2.1.0.drools16 6 ACTIVE org.jbpm.flow.core_5.3.0.Final 13 ACTIVE org.jbpm.bpmn2_5.3.0.Final 71 ACTIVE org.jbpm.flow.builder_5.3.0.Final 142 ACTIVE org.jbpm.flow-persistence-jpa_5.3.0.FINAL regards, Per Sterner

13 years, 1 month

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Drools: Using Declared Types in Decision Tables

by David Smith

Hi, I am trying to use a declared type in a decision table but get an "Unable to resolve ObjectType" message. The declared type is in a file types.drl, I have a spreadsheet test.xls that has a Ruleset with an import line for the declared type. Is it possible to reference a declared type from a decision table? Is it possible to declare a type in a decision table? Thanks David

13 years, 1 month

5
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rules-users June 2012