Not allowed to create transaction on shared EntityManager - use Spring transactions or EJB CMT

Solution 1:

I guess the problem here is that although you have defined the bean for the transaction manager, you haven't annotated the create() method with @Transactional which enables spring transactions.

Also remove the entityManager.getTransaction().commit(); statement as now all the transaction management will be handled by spring, if you leave the statement as it is then you will get the same error again.

Solution 2:

Injecting EntityManagerFactory instead of EntityManager and javax.transaction.Transactional annotation on method solved my issue as shown below.

//Autowire EntityManagerFactory
@PersistenceUnit(unitName = "readwrite.config")
private EntityManagerFactory entityManagerFactory;


//Use below code on create/update
EntityManager entityManager = entityManagerFactory.createEntityManager();

entityManager.getTransaction().begin();
if (!ObjectUtils.isEmpty(entity) && !entityManager.contains(entity)) {
   entityManager.persist(entity);
   entityManager.flush();
}
entityManager.getTransaction().commit();

Solution 3:

you need to remove entityManager.getTransaction().begin() statement and annotate method using @Transactional which enables spring transactions