Drools Flow migration to jBPM 5

If you are smart and wants to migrate from Drools Flow to jBPM 5 remember to configure the processInstanceFactory and processSignalFactory, using a Properties object or configuring them into the drools.conf file, before the creation of a KnowledgeSession.

Properties properties = new Properties();
properties.put("drools.processInstanceManagerFactory", 
   "org.jbpm.process.instance.impl.DefaultProcessInstanceManagerFactory");
properties.put("drools.processSignalManagerFactory", 
   "org.jbpm.process.instance.event.DefaultSignalManagerFactory");
KnowledgeSessionConfiguration config = KnowledgeBaseFactory.newKnowledgeSessionConfiguration(properties);
StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(config, EnvironmentFactory.newEnvironment());

otherwise you’ll obtain this RuntimeException

java.lang.RuntimeException: java.lang.ClassNotFoundException: Unable to load class: org.drools.process.instance.impl.DefaultProcessInstanceManagerFactory