For some reason I cannot get the most basic rule to fire from a flow. Not sure what is going on, but would appreciate some help. This is in Drools 5.1.0.M1.
I pretty much followed the example at http://www.developer.com/java/ent/article.php/10933_3821101_4/Rev-Up-the -Drools-5-Java-Rule-Engine.htm, but it did not work for me. I don't get an error message and I don't see the rule fire and print the system.out. .rf <?xml version="1.0" encoding="UTF-8"?> <process xmlns="http://drools.org/drools-5.0/process"; xmlns:xs="http://www.w3.org/2001/XMLSchema-instance"; xs:schemaLocation="http://drools.org/drools-5.0/process drools-processes-5.0.xsd" type="RuleFlow" name="flow" id="com.sample.bpmn.hello" package-name="com.sample"> <header> </header> <nodes> <end id="4" name="End" x="561" y="140" width="48" height="48" /> <start id="1" name="Start" x="66" y="88" width="48" height="48" /> <ruleSet id="3" name="Rule" x="368" y="159" width="80" height="48" ruleFlowGroup="helloGroup" /> </nodes> <connections> <connection from="3" to="4" /> <connection from="1" to="3" /> </connections> </process> .dlr package com.sample import com.sample.DroolsTest.Message; rule "Hello World Message" ruleflow-group "helloGroup" when m : Message( status == Message.HELLO, myMessage : message ) then System.out.println( myMessage + "***" ); m.setMessage( "Goodbye cruel world Message" ); m.setStatus( Message.GOODBYE ); update( m ); end Java package com.sample; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseFactory; import org.drools.bpmn2.xml.BPMNSemanticModule; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderConfiguration; import org.drools.builder.KnowledgeBuilderError; import org.drools.builder.KnowledgeBuilderErrors; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.builder.ResourceType; import org.drools.compiler.PackageBuilderConfiguration; import org.drools.io.ResourceFactory; import org.drools.logger.KnowledgeRuntimeLogger; import org.drools.logger.KnowledgeRuntimeLoggerFactory; import org.drools.runtime.StatefulKnowledgeSession; /** * This is a sample class to launch a rule. */ public class DroolsTestFlowAndRule { public static final void main(String[] args) { try { // load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test"); // start a new process instance' Message message = new Message(); message.setMessage("Hello World Message"); message.setStatus(Message.HELLO); ksession.insert(message); ksession.startProcess("com.sample.bpmn.hello"); ksession.fireAllRules(); logger.close(); } catch (Throwable t) { t.printStackTrace(); } } private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("hello.rf"), ResourceType.DRF); kbuilder.add(ResourceFactory.newClassPathResource("Sample.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 static class Message { public static final int HELLO = 0; public static final int GOODBYE = 1; private String message; private int status; public String getMessage() { return this.message; } public void setMessage(String message) { this.message = message; } public int getStatus() { return this.status; } public void setStatus(int status) { this.status = status; } } }
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