Best actively maintained Java XMPP Library? [closed]

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Closed 8 years ago.

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I've seen several XMPP libraries for Java that seem to have little update activity in the past few years.

What is the best current XMPP library with support for: - Basic chat - TLS - MUC - PubSub

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Perhaps that is because XMPP has been stable over that timespan. Anyway, I like Smack, but I've done nothing more than experiment with XMPP.