Perhaps but not cocoa/aqua native. In other words, eclipse can't use it to display GUI elements unless you rebuild eclipse to use x11, and then finder drag and drop is lost among other things
That's not true, Eclipse uses native cocoa widgets, so it is largely unaffected by this. But it does rely on a few extensions to standard java provided by the mac version of the JVM, and these will have to be dealt with. X11 will never be necessary to run an SWT app on mac.
John