If "Audited" Entity is used, CustomInterceptor#beforeTransactionCompletion() will be invoked 2 times due to the following code block:
(In the beforeCompletion() method, beforeTransactionCompletion() will be invoked.)

org.hibernate.internal.SessionImpl.addSharedSessionTransactionObserver()

{{}}

@Override
protected void addSharedSessionTransactionObserver(TransactionCoordinator transactionCoordinator) {
this.transactionObserver = new TransactionObserver() {
@Override
public void afterBegin() {
}

@Override
public void beforeCompletion() {
if ( isOpen() && getHibernateFlushMode() != FlushMode.MANUAL )

{ managedFlush(); }

actionQueue.beforeTransactionCompletion();
try

{ getInterceptor().beforeTransactionCompletion( getTransactionIfAccessible() ); }

catch (Throwable t)

{ log.exceptionInBeforeTransactionCompletionInterceptor( t ); }

}

@Override
public void afterCompletion(boolean successful, boolean delayed) {
afterTransactionCompletion( successful, delayed );
if ( !isClosed() && autoClose )

{ managedClose(); }

}
};
transactionCoordinator.addObserver(transactionObserver);
}