JMXConnector.connect() will block for the default TCP connect timeout if the remote machine is unavailable. Unless the global VM settings are changed, this is of the order of a couple of minutes.

It would be useful to be able to provide a timeout value for a connection, to be able to deal with error cases better.

JMXConnector.connect(Map env)

could take a new key/value pair to specify a connection timeout value, and then Socket.connect(SocketAddress, timeout) could be called underneath.
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