KDE should be supported at least as well as GTK/Gnome in J2SE 6.0.
For instance, right now drag-n-drop from the KDE file manager to a java application does not work.
KDE is supported as long as it continues to support standard protocols (XDND, _NET, XEmbed). As for drag-n-drop from individual applications, we are unlikely to support it if it can not be represented by standard flavors. You may add the support for arbitrary data in your application using flavor map API.
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