Jonathan Albornoz [https://community.jboss.org/people/betoflint] created the discussion "JPAKnowledgeService Exception" To view the discussion, visit: https://community.jboss.org/message/790106#790106 -------------------------------------------------------------- Hi people, i'm running the project that comes with the book of jbpm development guide, the chapter 8. I run everything, i have configured jbpm 5.4 with jboss 7.1.1 and oracle like my db persistence. but when i want runit appear the next exception. Any idea why?? The code where appear the exception is the next. KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();         kbuilder.add(new ClassPathResource("process-async-interactions.bpmn"), ResourceType.BPMN2);         if (kbuilder.hasErrors()) {             for (KnowledgeBuilderError error : kbuilder.getErrors()) {                 System.out.println(">>> Error:" + error.getMessage());             }             System.out.println(">>> Hay problemas con el archivo .bpmn! ");         }         KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();         kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());         Environment env = EnvironmentFactory.newEnvironment();         EntityManagerFactory emf = Persistence.createEntityManagerFactory("org.jbpm.runtime");         env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, emf);         env.set(EnvironmentName.TRANSACTION_MANAGER, TransactionManagerServices.getTransactionManager());         // Let's create a Persistence Knowledge Session         System.out.println(" >>> Let's create a Persistent Knowledge Session"); StatefulKnowledgeSession ksession = JPAKnowledgeService.newStatefulKnowledgeSession(kbase, null, env); //here generate the exception. The exception code.... Exception in thread "main" java.lang.NoSuchMethodError: org.drools.SessionConfiguration.addDefaultProperties(Ljava/util/Properties;)V           at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.mergeConfig(KnowledgeStoreServiceImpl.java:147)           at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newStatefulKnowledgeSession(KnowledgeStoreServiceImpl.java:66)           at org.drools.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:122)           at com.salaboy.jbpm5.correr.crearProceso(correr.java:90)           at com.salaboy.jbpm5.correr.main(correr.java:41) thanks!!!! -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/790106#790106] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]