WFLYJPA0060: Transaction is required to perform this operation (either use a transaction or extended persistence context)

Hello,

In a JAX-RS service, using RestEasy 3.0 on Wildfly 10.1, I have the following producer:

@ApplicationScoped
public class EntityManagerProducer
{
@PersistenceContext(unitName = "customers")
private EntityManager em;

@Produces
@Default
@RequestScoped
public EntityManager createEntityManager()

{ return em; }

public void dispose(@Disposes @Default EntityManager entityManager)

{ if (entityManager.isOpen()) entityManager.close(); }

}

The following end-point:

@Inject
private CustomerManagementRepository repo;
..............
@POST
@Consumes(MediaType.APPLICATION_JSON)
@Transactional
public Response createCustomer(Customer customer)

{ Customer newCustomer = repo.saveAndFlushAndRefresh(customer); return Response.created(URI.create("/customers/" + newCustomer.getId())).build(); }

raises the exception:

14:57:53,121 ERROR [io.undertow.request] (default task-1) UT005023: Exception handling request to /customer-management/services/customers: org.jboss.resteasy.spi.UnhandledException: javax.persistence.TransactionRequiredException: WFLYJPA0060: Transaction is required to perform this operation (either use a transaction or extended persistence context)
at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:77)
at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:220)
................

Here above the CustomerManagerRepository is:

@Repository
public interface CustomerManagementRepository extends EntityRepository<Customer, BigInteger>

{ public List<Customer> findByFirsName(String firstName); public List<Customer> findByLastName (String lastName); public List<Customer> findByCountry (String country); public List<Customer> findByCity (String city); public List<Customer> findByZip (String zip); public List<Customer> findByState (String state); public List<Customer> findByStreet (String street); }

I also have the following beans.xml file:

<?xml version="1.0"?>
<beans bean-discovery-mode="annotated" version="2.0" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_2_0.xsd">
<alternatives>
<class>org.apache.deltaspike.jpa.impl.transaction.ContainerManagedTransactionStrategy</class>
</alternatives>
</beans>

What I'm doing wrong here ?