I have a ejb3 project with managed singleton: | @Service (name = ProfileStateMachine.NAME, objectName = "vis:service=StateMachine") | @Management (IMainStateMachine.class) | @Remote (ProfileStateMachine.class) | public class MainStateMachine implements IMainStateMachine, ProfileStateMachine { | @PersistenceContext (unitName = "vis") | private EntityManager entityManager; | | void start(){ | SomeEntity entity1=entityManager.find(SomeEntity.class,2); | | SomeEntity entity2=new SomeEntity(); | entity2.setFieldOne("one"); | entity2.setFiledTwo("two"); | entityManager.persist(entity2); | } | | void stop(){ | } | } | interface IMainStateMachine | public interface IMainStateMachine { | void start(); | | void stop(); | | } I receive a exception during project deployment | Caused by: javax.persistence.TransactionRequiredException: EntityManager must be access within a transaction | at org.jboss.jpa.deployment.ManagedEntityManagerFactory.verifyInTx(ManagedEntityManagerFactory.java:155) | at org.jboss.jpa.tx.TransactionScopedEntityManager.persist(TransactionScopedEntityManager.java:186) | The exception is thrown at the persist command | entityManager.persist(entity2); | I think the start() method is executed before the project was deployed. Same operation ("entityManager.persist()") works well if it is executed after deploy. My project has a three stage: starting, working, stopping. I need to use EntityManager during all stages. What I should do to solve the problem? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4269678#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...