Transaction synchronisation should only be registered if the transaction is active

main = TransactionHelper.lookupTransactionManager().getTransaction();
if (main != null) {
    if (main.getStatus() != Status.STATUS_MARKED_ROLLBACK) {
        main.registerSynchronization(this);
        session.afterBegin();
        threadBound.set(main);
    }
}

if (main.getStatus() == Status.STATUS_ACTIVE) {
  ...
}