Francesco Pietrobelli [http://community.jboss.org/people/francesco.pietrobelli] created the discussion "Re: Unknown error using timer in JEE" To view the discussion, visit: http://community.jboss.org/message/620405#620405 -------------------------------------------------------------- Thank of your answer, but my problem is slighty different because i use container managed transaction and i don't have NPE on TranscationManager but i have it on appScopedEntityManager of org.drools.persistence.jpa.JpaPersistenceContextManager. I can't understand why since my stateless EJB load the session specify an enviroment in this way: @Stateless public class .... {          @PersistenceUnit(unitName = "org.jbpm.persistence.jpa")      private EntityManagerFactory engineEmf;        @PostConstruct      public void init(){           ....           env = KnowledgeBaseFactory.newEnvironment();           env.set(EnvironmentName.ENTITY_MANAGER_FACTORY, engineEmf);           ....      }        ....           private StatefulKnowledgeSession getSessionById(int id) {           StatefulKnowledgeSession ksession = JPAKnowledgeService.loadStatefulKnowledgeSession(id, kbase, null, env);           log.info("Loaded session with id=" + id + ": " + ksession);           ksession = registerSessionStuff(ksession);           return ksession;      }      .... } and my persistence.xml is like this: <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <persistence version="1.0"           xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd http://java.sun.com/xml/ns/persistence/orm http://java.sun.com/xml/ns/persistence/orm_1_0.xsd"           xmlns:orm="http://java.sun.com/xml/ns/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"           xmlns="http://java.sun.com/xml/ns/persistence">           <persistence-unit name="org.jbpm.persistence.jpa" transaction-type="JTA">                     <jta-data-source>java:myDataSource</jta-data-source>                     <!-- Runtime classes -->                     <class>org.drools.persistence.info.SessionInfo</class>                     <class>org.drools.persistence.info.WorkItemInfo</class>                     <class>org.jbpm.persistence.processinstance.ProcessInstanceInfo</class>                       <!-- BAM classes-->                     <class>org.jbpm.process.audit.ProcessInstanceLog</class>                     <class>org.jbpm.process.audit.NodeInstanceLog</class>                     <class>org.jbpm.process.audit.VariableInstanceLog</class>                       <properties>                               <property name="hibernate.dialect" value="org.hibernate.dialect.H2Dialect" />                               <property name="hibernate.hbm2ddl.auto" value="update" />                               <property name="hibernate.show_sql" value="false" />                               <property name="hibernate.jdbc.batch_size" value="0"/>                     </properties>           </persistence-unit> </persistence> maybe is a bug? -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/620405#620405] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]