Java WebStart disallow multiple instances?

Use the SingleInstanceService See an example here : But you have to remember to unregister the instance later. So maybe a better way (it is a hack :) ) would be to try to listen to a TCP port in the beginning and if it fails you do not start. In this way if you forgot to stop listening to the TCP port before exiting you will still be "unregistered" because the TCP port will be closed automatically by the OS.

Use the SingleInstanceService. See an example here: But you have to remember to unregister the instance later. So maybe a better way (it is a hack :) ) would be to try to listen to a TCP port in the beginning and if it fails you do not start.In this way if you forgot to stop listening to the TCP port before exiting you will still be "unregistered" because the TCP port will be closed automatically by the OS.

See an example here:" See a self contained example here. I've never tested it with an embedded applet though. – Andrew Thompson Oct 28 at 11:23.

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