Solved The external app was creating a new connection for every message (DOH!). I'd copied and pasted the jms message sending code from somewhere that was running inside JBoss. That was expecting JBoss to manage a jms connection pool, whereas the external app was creating a new connection every time it sent a message. So I was running out of threads pretty quickly (even when I had the max number set at 2000). Properly synchonized access to the connection and shared it between the messages, and everything's back under control.
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