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?
