java.lang.IllegalStateException: No transactional EntityManager available

by

You must annotate the method with the @Transactional annotation:

@Transactional
public void fooBar() {
   // Exception from this line
   Session session = getEntityManager().unwrap(Session.class);
   ...
}

And, if necessary e.g. when using plain Spring framework, enable the Spring @Transactional processing with the following declaration in your Spring’s xml configuration file (where txManager is the ID of your manager):

<tx:annotation-driven transaction-manager="txManager" />

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