Can I use Java callout to subscribe to external JMS topic (pull) and implement listener logic? in this scenario my callout will include client.listen() code and will respond to events/messages published to the topic it subscribed to. If not, what are the alternatives?
No, don't do that.
A better alternative is to host your logic outside of Apigee Edge. For example, in Google App Engine. Subscribe to the JMS topic, and when you get a notification in YOUR code, you can send a request into the Apigee Edge proxy (or some other HTTPS endpoint).
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