entitymanager.java

//old
	public void flush() {
		try {
			if ( !isTransactionInProgress() ) {
				throw new TransactionRequiredException( "no transaction is in progress" );
			}
			getSession().flush();
		}
		catch ( RuntimeException e ) {
			throw convert( e );
		}
	}

//new
	public void flush() {
		if ( !isTransactionInProgress() ) {
			throw new TransactionRequiredException( "no transaction is in progress" );
		}
		try {
			getSession().flush();
		}
		catch ( RuntimeException e ) {
			throw convert( e );
		}
	}

Thanks, suggested patch applied to my branches for HHH-6095