Hi, I was trying to change the persistence settings for human task process server for using MySQL instead of H2DB. I was following the Drools Flows Documentation on chapter 5.1.3.: Configuring Persistence.(https://hudson.jboss.org/hudson/job/drools/lastSuccessfulBui... #d0e1157) I read on docs that I should override the persistence.xml of the drools-process-enterprise.jar, create the drools.session.conf with some contents (i don`t undestand` what it is...) and put them on my project META-INF directory... ok? I created the files as stated on docs but it didn't work... My example runned ok, but using the H2DB and not my MYSQL. // Use persistence.xml configuration emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa"); taskService = new TaskService(emf); taskSession = taskService.createSession(); server = new MinaTaskServer(taskService); Thread thread = new Thread(server); thread.start(); Thread.sleep(500); System.out.println("Server started ..."); <properties> <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" /> <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" /> <property name="hibernate.connection.url" value="jdbc:mysql:// localhost/drools" /> <property name="hibernate.connection.username" value="root" /> <property name="hibernate.connection.password" value="" /> <property name="hibernate.connection.autocommit" value="false" /> <property name="hibernate.max_fetch_depth" value="3" /> <property name="hibernate.hbm2ddl.auto" value="create-drop" /> <property name="hibernate.show_sql" value="true" /> </properties> After some investigation I could see that the example recommended by Mark Proctor (TaskLifeCycleTest.java, and others that use MinaTaskServer) use <persistence-unit name = "org.drools.task"> that is setting on drools-process-task.jar and not the "org.drools.persistence.jpa" on drools-process-enterprise.jar as stated on documentation... First question, which one should I use for use the Drools Flows Server and Client? emf = Persistence.createEntityManagerFactory( "org.drools.task" ); emf = Persistence.createEntityManagerFactory("org.drools.persistence.jpa"); I test the first option. I changed the persistence.xml file and use the code below: // Use persistence.xml configuration emf = Persistence.createEntityManagerFactory("org.drools.task"); taskService = new TaskService(emf); taskSession = taskService.createSession(); server = new MinaTaskServer(taskService); Thread thread = new Thread(server); thread.start(); Thread.sleep(500); System.out.println("Server started ..."); Hummm.... It runs and connect well to my MySQL. but now it brings me a error... java.lang.IllegalArgumentException: Named query not found: UnescalatedDeadlines at org .hibernate .ejb .AbstractEntityManagerImpl .createNamedQuery(AbstractEntityManagerImpl.java:108) at org.drools.task.service.TaskService.<init>(TaskService.java:84) at org.drools.task.service.TaskService.<init>(TaskService.java:68) It sounds like it was not possible to find orm.xml that is on META-INF of drools-process-task.jar. But when I copy the orm.xml file to my project META-INF it works ok.... Could someone give some ideas how can I solve this problem.. Thanks a lot Cristiano