blog.java

        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        // 這裡我將drl檔案放在 drools/example1.drl 這裡，記得改成你的檔案目錄
        kbuilder.add(ResourceFactory.newClassPathResource("drools/example1.drl"), ResourceType.DRL);
        // 確認載入是否有錯誤
        if (kbuilder.hasErrors()) {
            System.out.println(kbuilder.getErrors().toString());
            throw new RuntimeException("Unable to compile \"example1.drl\".");
        }
        // 取得所有Package
        Collection<KnowledgePackage> pkgs = kbuilder.getKnowledgePackages();
        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages(pkgs);
        StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
        ksession.addEventListener( new DebugAgendaEventListener() );
        // Set up Message.
        Message message = new Message();
        message.setMessage("Hello World");
        message.setStatus(Message.HELLO);
        ksession.insert(message);
        // 跑所有Rule
        ksession.fireAllRules();
        ksession.dispose();