Originally Posted by
SQPPS
Of course you can access the CX lounge with a business class boarding pass. Just don't show your pass to the travelers lounge when you walk into the lounge. If they don't let you in, show the print out of the rules from the OW website. The Cathay Staff usually knows though dn will let you in. I had the same issue with a RJ flight in business and they tried not to let me in. After that incident, I wrote to their COO, received a gift and a promise that they would not make the mistake again.
FROM OW Website:
http://www.oneworld.com/ffp/lounge-access/
Now you're missing the whole point here, please read what has been said above and also what your own link is saying. OW have changed the rules about class of service based lounge access.
AY J BP (or any other OW J BP for that matter) is NOT enough for general OW lounge access anymore. You need min. Sapphire status on top. With just the J BP you can access the lounge the airline in question uses at any particular airport.
At HKG CX J BP is ok for CX J lounges for sure but this thread is about AY J ticket.