Originally reported at: http://mail.openjdk.java.net/pipermail/macosx-port-dev/2012-December/005245.html

The FileDialog won't work properly if it's shown while an AWT SplashScreen is showing. The problem is not related to bundled application, but is reproducible if specifying the -splash: command-line option as well.

See the mailing list thread for a sample app and more details.