Are you inserting the instance of the dynamically loaded class into the KnowledgeBase? i.e. session.insert(dynamicInstance); If not the rule won't get fired. Cheers, Swapnil 2009/11/3 Hemanth kumar <hemanth(a)saha.in&gt; > hi, > Im working on a sample test project. > In that im dynamically creating a class ( fact) and compiling it. > > here is my test project > > -------------------------------------------------------------------------------------- > mainJavaclass > > > public void runRule() > { > try { > System.out.println("\nRunning rule\n"); > > // go ! > > URL[] urls = new URL[]{ new > URL("file://"+path) }; > > URLClassLoader ucl = new > URLClassLoader(urls); > Class<?> clazz = > ucl.loadClass("test.Message"); > Object classObj = clazz.newInstance(); > > > Method method = > clazz.getDeclaredMethod("setMessage", new Class[]{String.class}); > > //System.out.println("facts loaded\n"); > > method.invoke(classObj, new > Object[]{"Hello"}); > > > log.info("==== Calling Rule Runner > ======"); > > Collection facts = new ArrayList(); > facts.add(classObj); > > > // Load and fire our rules files against > the > data > new > RuleRunner().runStatelessRules(RULES_FILES, null, facts, null, null, > logger); > > } > catch (Throwable t) { > t.printStackTrace(); > } > > } > > ---------------------------------------------------------------------- > Fact > > package test; > public class Message{ > private String message; > public String getMessage(){ > return this.message; > } > > public void setMessage(String message) { > this.message = message; > } > > } > > > ------------------------------------------------------------------------ > sample rule > > package test > import test.Message; > > rule "Your First Rule" > dialect "mvel" > when > m:Message(message != "Good Bye" ) > then > System.out.println("First Rule fired "+m.message ); > modify(m){ message = "Good Bye"}; > end > ----------------------------------------------------------------- > http://old.nabble.com/file/p26160051/console.PNG console.PNG > > what happens is when i was running the project inside eclipse IDE it works > fine but when i hosted in tomcat and calling from outside ide the rule is > not getting fired. > I think the dyanamically loaded class is not recognised by the rule > engine. > > suggest me any ideas or post an working example > > Hemanth > -- > View this message in context: > http://old.nabble.com/Class-loader-problem-tp26160051p26160051.html > Sent from the drools - user mailing list archive at Nabble.com. > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

swapnil thanx for the reply, this is my modified code try{ System.out.println("Initializing Fact...."); URL[] urls = new URL[]{ new URL("file://"+path) }; ClassLoader loader = new URLClassLoader(urls); Class clazz = loader.loadClass("test.Message"); //Class.forName("test.Message", false, ucl); Object factObj = clazz.newInstance(); String ruleFile = "test/Sample.drl"; Method method = clazz.getMethod("setMessage", new Class[]{String.class}); Method method1 = clazz.getMethod("getMessage"); //System.out.println("facts loaded\n"); method.invoke(factObj, new Object[]{"Hello"}); System.out.println("initializing packageBuilder"); PackageBuilderConfiguration config = new PackageBuilderConfiguration(); config.setClassLoader(loader); KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(config); System.out.println("finding Rule"); kbuilder.add(ResourceFactory.newClassPathResource("test/Sample.drl"),ResourceType.DRL); if (kbuilder.hasErrors()) throw new RuntimeException("Unable to compile rules. " + kbuilder.getErrors().toString()); KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(new RuleBaseConfiguration(loader)); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); StatelessKnowledgeSession session = kbase.newStatelessKnowledgeSession(); System.out.println("running rule....... \n"); session.execute(factObj); System.out.println("\nend...\n"); System.out.println(method1.invoke(factObj).toString()); } catch (Throwable t) { t.printStackTrace(); } ------------------------------------------------------------ Added the following JARS in WEB-INF\lib antlr-runtime-3.1.1.jar core-3.4.2.v_883_R34x.jar drools-api-5.0.1.jar drools-core-5.0.1.jar drools-decisiontables-5.0.1.jar mvel2-2.0.10.jar drools-compiler-5.0.1.jar xstream-1.3.1.jar thanx and regards Hemanth -- View this message in context: http://old.nabble.com/Class-loader-problem-tp26160051p26191859.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users

Hi swapnil thanx for the reply I think there is no error in url path.for a week i was not active in my project. Im sending my sample project Here is my sample application --------------------------------------------------------------------- main java class http://old.nabble.com/file/p26262304/ruleTest.txt ruleTest.txt sample rule http://old.nabble.com/file/p26262304/Sample.drl Sample.drl tomcat console http://old.nabble.com/file/p26262304/console1.PNG console1.PNG Added following jars in tomcat/lib ( actual path : C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\JStudio\WEB-INF\lib) antlr-runtime-3.1.1.jar core-3.4.2.v_883_R34x.jar drools-api-5.0.1.jar drools-compiler-5.0.1.jar drools-core-5.0.1.jar drools-jsr94-5.0.1.jar drools-decisiontables-5.0.1.jar mvel2-2.0.14.jar xstream-1.3.1.jar suggest me any ideas -- View this message in context: http://old.nabble.com/Class-loader-problem-tp26160051p26262304.html Sent from the drools - user mailing list archive at Nabble.com. _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users