Single instance app with native packaging

Is there any way to allow only one instance of the app to run with javafx2 native packaging? Like an attribute in the build.xml or something?
I'm using the .exe for windows and the .dmg for mac.
Appreciate your help.

There is no simple deployment build switch that I know of for achieving a single instance app.
A couple of ideas (none of which I have tried).
Perhaps you could use the SingleInstanceService:
http://www.oracle.com/technetwork/articles/java/fxbest-1583679.html "Ensuring Only One Instance of the Application Is Started"
http://docs.oracle.com/javase/7/docs/technotes/guides/javaws/developersguide/examples.html#SingleInstanceService "SingleInstanceService"
It is a jnlp api based service though and I'm not sure if such a service would be available to a packaged app (maybe it would require including the jre/lib/javaws.jar file with your app or something like that).
You could write out a lock file when the app starts.
On unix (i.e. mac/linux) the lock could include the process pid for your app. On startup, check if there is a process with the lock pid currently running, if so, don't startup and perhaps send an interrupt signal to the existing app notifying it that the user tried to start a new instance.
On windows you could read and write the lock value value from the registry.
To get rid of the OS specific stuff surrounding this, perhaps this kind of lock logic could be implemented using the Java Preferences API:
http://docs.oracle.com/javase/7/docs/technotes/guides/preferences/index.html
Intellij Idea is open source and and seems to have this kind of functionality, so you could check how they do it.

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