The Classic issue of entityManager.persist(): no errors but not inserting to db

I am having a strange issue while inserting a new entry.

Problem: entityManager.persist(myEntiy) : line is executed but no entry is created in the db.

I know many had this issue before and i have read all of those posts but none of it answers my problem. I am not inserting an entry for the first time. So i have did the configuration and other basic things right. That means I do use <tx:annotation-driven transaction-manager="jpaTransactionManager"/> in my spring-core.xml and I do use an @Transactionalon top of the methods in my dao.

Solutions tried: Adding entityManager.flush() after persist, but this resulted in

javax.persistence.TransactionRequiredException: no transaction is in progress.

Also tried:

em.getTransaction().begin(); em.persist(entity); em.getTransaction().commit();

which resulted in

Not allowed to create transaction on shared EntityManager

Then saw someone saying the problem may be the

AbstractSaveEventListener - delaying identity-insert due to no transaction in progress

but i didnt have anything in log saying that this may be the cause. And i dont have a clue what exactly is the solution if that is the issue. My hibernate log ends with the line.

DEBUG [80-exec-2 SqlStatementLogger.java: 104] select mySchema.sequence_for_my_entity_PK.nextval from dual

no errors whatsoever there. Any help is appreciated.