问题
Our application that will act as a client needs to subscribe to an external system that uses cometd to deliver unsolicited notifications to clients. Is there a way to achieve this without cometd libraries (via apache HttpClient for instance)? Java version mismatch is the problem - we use 1.6, but cometd require 1.7 or higher.
thanks in advance
回答1:
CometD 2.x, albeit not under development anymore, supports back to JDK 5.
The underlying protocol (Bayeux) is the same, so I expect a CometD 2.x client to work against a CometD 3.x server.
The alternative is for you to reimplement the Bayeux protocol from scratch, which is not that difficult but it does require a bit of work.
来源：https://stackoverflow.com/questions/37182217/java-client-to-subscribe-to-cometd-channels