tx attributte - supports doesn't work as expected

[adamzrk]

Hi

I've got an EJB:

@Stateless
@TransactionAttribute(TransactionAttributeType.SUPPORTS)
public class AirportDaoBean implements AirportDaoLocal, AirportDaoRemote {

 @PersistenceContext
 private EntityManager manager;

 @Override
 public void createAirport(Airport airport) {
 manager.persist(airport);
 }

 @Override
 public Airport getAirportById(int id) {
 return manager.find(Airport.class, id);
 }

 @Override
 public List<Airport> getAll() {
 return manager.createQuery("from Airport order by city.country.name").getResultList();
 }

}

As you can see I configured it with SUPPORTS transaction attribute, so when there is a transaction all methods in my bean will use it, when there is no transaction context then bean wouldn't begin a new one. So my question is: why i get the exception:

Caused by: javax.persistence.TransactionRequiredException: EntityManager must be access within a tra
nsaction
 at org.jboss.ejb3.entity.ManagedEntityManagerFactory.verifyInTx(ManagedEntityManagerFactory.
java:150)
 at org.jboss.ejb3.entity.TransactionScopedEntityManager.persist(TransactionScopedEntityManag
er.java:174)
 at master.airport.logic.impl.AirportDaoBean.createAirport(AirportDaoBean.java:24)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:597)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:112)
 at org.jboss.ejb3.interceptor.InvocationContextImpl.proceed(InvocationContextImpl.java:166)
 at org.jboss.ejb3.interceptor.EJB3InterceptorsInterceptor.invoke(EJB3InterceptorsInterceptor
.java:63)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:101)
 at org.jboss.ejb3.entity.TransactionScopedEntityManagerInterceptor.invoke(TransactionScopedE
ntityManagerIntercepto

Regards
Adam

[jaikiran]

EntityManager must be access within a transaction

Which means that when you are accessing the entity manager in your createAirport method, there should be an active transaction. As you already correctly mentioned:

As you can see I configured it with SUPPORTS transaction attribute, so when there is a transaction all methods in my bean will use it, when there is no transaction context then bean wouldn't begin a new one

I believe when the createAirport method is being called, there is no active transaction and since the transaction attribute that you have specified is SUPPORTS, the server wont create a new one. You might want to change the transaction attribute to REQUIRED instead of SUPPORTS. For transaction attribute REQUIRED, a new transaction is created when there is no active transaction. If there is a active transaction then the same will be used for that method. So try changing

@TransactionAttribute(TransactionAttributeType.SUPPORTS)

to

@TransactionAttribute(TransactionAttributeType.REQUIRED)

[adamzrk]

I know what all transaction attributes mean and I do not want the REQUIRED attribute. According to specification jboss have implemented tx support not very well.....

Regards
Adam