// Yesterday: serialize a KP collection OutputStream os = new FileOutputStream( pkgPath ); ObjectOutputStream oos = new ObjectOutputStream( os ); oos.writeObject( kBuilder.getKnowledgePackages() ); oos.close(); // Today: load serialized packages KnowledgeBase kBase = KnowledgeBaseFactory.newKnowledgeBase(); InputStream is = new FileInputStream( pkgPath ); ObjectInputStream ois = new ObjectInputStream( is ); @SuppressWarnings("unchecked") Collection<KnowledgePackage> kpkgs = (Collection<KnowledgePackage>) ois.readObject(); ois.close(); kBase.addKnowledgePackages( kpkgs ); You may, of course, add more packages, compiled now. -W 2010/11/18 Yaniv Itzhaki <iyaniv(a)gmail.com&gt;

Thanks, I will try that... 2010/11/18 Anderson Rocha <anderson.ufal(a)gmail.com&gt;

Hi, Have a look at KnowledgeBuilder's use of ResourceFactory. There's a newReaderResource() static method which could be passed a StringReader rather than writing to an intermediate file. AFAIK kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()) is effectively the "addRule" you desire. With kind regards, Mike 2010/11/18 Pierre de Leusse <pdl(a)agh.edu.pl&gt;

Thanks Nathan and Mike! It did the trick. I wish there were easier solution code wise though. Od: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] W imieniu Nathan Bell Wysłano: Thursday, November 18, 2010 9:22 PM Do: Rules Users List Temat: Re: [rules-users] Programatically adding rules toKnowledgeBase/StatefulKnowledgeSession Here is a method cut & pasted from working code in a validation class used by some of my unit tests. I think it does what you are asking. private ValidationResult addDrlToKnowledgeBase(String drlAsString ) { ValidationResult retval = null; try { KnowledgeBuilder kBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); Reader rdr = new StringReader(drlAsString); Resource resource = ResourceFactory.newReaderResource(rdr); kBuilder.add(resource, ResourceType.DRL); if (kBuilder.hasErrors()) { retval = ValidationResult.newInstance("DRL errors: " + kBuilder.getErrors().toString(), null, null); } else { knowledgeSession.getKnowledgeBase().addKnowledgePackages(kBuilder.getKnowled gePackages()); retval = ValidationResult.newInstance(); } } catch(Exception ex) { retval = ValidationResult.newInstance(ex.getMessage(), null, ex); } return retval; } The type of the instance variable "knowledgeSession" is "StatefulKnowledgeSession". Ignore the class "ValidationResult", it is a custom class used for returning results from this validation helper class. Hope this helps. -Nathan Bell From: rules-users-bounces(a)lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org] On Behalf Of Pierre de Leusse Sent: Thursday, November 18, 2010 8:14 AM To: 'Rules Users List' Subject: [rules-users] Programatically adding rules toKnowledgeBase/StatefulKnowledgeSession Hello all, I'm trying to add rules through my java code to a KnowledgeBase and I cannot find any easy way to do so. So far, the only solution I could think of, is to write the rule as DRL in a file that is "observed" by a KnowledgeAgent (same with a RuleAgent I suppose). Is it possible to create a new KnowledgePackage with the same name as the existing one and load it into the KnowledgeBuilder? I manage to remove rules using the following code: statefulKnowledgeSession.getKnowledgeBase().removeRule(knowledgeSetName, ruleName); I thought that there would be a addRule method somewhere but not luck so far. The code I'm using to create my KnowledgeBase and StatefulKnowledgeSession is shown below. All the best, Pierre StatefulKnowledgeSession creation code: StatefulKnowledgeSession ksession; KnowledgeBuilder kbuilder; KnowledgeBase kbase; kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newFileResource(Demo.class.getResource(Demo.drl File).getPath()), ResourceType.DRL); if (kbuilder.hasErrors()) { System.out.println(kbuilder.getErrors()); } kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kbuilder.getKnowledgePackages()); ksession = kbase.newStatefulKnowledgeSession(); ksession.insert(.); . ksession.fireAllRules();