[rules-users] Drools v5 multithreading questions

Hello, All! I’m evaluating the new version of Drools (5.0.1), so I’m especially interested in multithreading and partitioning options, implemented in Drools v5. I’ve prepared a little test case to check how the feature works. Here is the rule I’m using: package test rule test when NODE2($p : value > 20) then System.out.println("Fired :” + $p); end The NODE2 POJO is very simple: public class NODE2 { private int value; public NODE2(int value) { this.value = value; } public int getValue() { return value; } public void setValue(int value) { this.value = value; } } And here is the main code snippet: 1: KnowledgeBaseConfiguration conf = KnowledgeBaseFactory.newKnowledgeBaseConfiguration(); 2: conf.setOption(MultithreadEvaluationOption.YES); 3: conf.setOption(MaxThreadsOption.get(10)); 4: KnowledgeBase kb = KnowledgeBaseFactory.newKnowledgeBase(conf); 5: 6: KnowledgeBuilder bld = KnowledgeBuilderFactory.newKnowledgeBuilder(); 7: bld.add(ResourceFactory.newReaderResource(new StringReader(rule)), ResourceType.DRL); 8: kb.addKnowledgePackages(bld.getKnowledgePackages()); 9: 10: StatefulKnowledgeSession session = kb.newStatefulKnowledgeSession(); 11: session.insert(new NODE2(25)); 12: 13: session.fireAllRules(); In such a case my program hangs and nothing is displayed in the Console. If I put lines 10-11 prior to line 6, I get a NullPointerException: Exception in thread "main" java.lang.NullPointerException at org.drools.reteoo.ObjectSource.addObjectSink(ObjectSource.java:124) … But, if I comment out the lines 2&3, everything works ok… So, please help – what I’m doing wrong? Best regards, Andrey