How to now in the app that it was updated?

[timoreichen]

So the app can show a "That's new"-Button and show the corresponding Releasenotes.

[shannah]

You could use the jdeploy.app.version system property. Store somewhere, e.g. in Preferences, on launch. If it is different than the value you stored last time, then you know it has been updated.

[timoreichen]

Cool, thank you!