Hi all, I'm getting 2 different errors trying to unmarshalling 2 different KBases: 1: org.drools.RuntimeDroolsException: unable to determine operator for symbol [after] 2: java.io.StreamCorruptedException: invalid stream header: 776CACED The 1st one seems to be caused when using the operator after in the DRL, so the marshalling/unmarshalling strategies dont support CEP rules? The 2nd one could be caused because of using different marshallers ... but I use the same!! My marshalling methods are: public void save(FileOutputStream out) throws IOException{ DroolsObjectOutputStream droolsOut = new DroolsObjectOutputStream(out); droolsOut.writeObject(ksession.getKnowledgeBase()); Marshaller mas = createMarshaller(ksession.getKnowledgeBase()); mas.marshall(droolsOut, ksession); } public void load(FileInputStream input) throws IOException, ClassNotFoundException{ DroolsObjectInputStream droolsIn = new DroolsObjectInputStream(input); KnowledgeBase kbase = (KnowledgeBase)droolsIn.readObject(); Marshaller mas = createMarshaller(kbase); ksession = mas.unmarshall(input); } private Marshaller createMarshaller(KnowledgeBase kbase){ ObjectMarshallingStrategyAcceptor acceptor = MarshallerFactory.newClassFilterAcceptor(new String[]{"*.*"}); ObjectMarshallingStrategy strategy = MarshallerFactory.newSerializeMarshallingStrategy(acceptor); return MarshallerFactory.newMarshaller(kbase,new ObjectMarshallingStrategy[]{strategy}); } -- View this message in context: http://www.nabble.com/Error-unmarshalling-KnowledgeBase-tp24788799p247887... Sent from the drools - user mailing list archive at Nabble.com.