You have to inject the same class loader which loaded your dynamic class into the drools. Here is the blog post outlining how to do it as well as some caveats with classloaders... http://www.ilyasterin.com/blog/2009/10/java-multiple-class-loaders-issue.... On Tue, Oct 27, 2009 at 2:30 AM, Hemanth kumar <hemanth(a)saha.in&gt; wrote: > > > 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 > ----------------------------------------------------------------- > console file  http://www.nabble.com/file/p26072723/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 > > Hemanth > -- > View this message in context: > http://www.nabble.com/couuld-not-load-fact-to-rule-engine-tp26072723p2607... > 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