This Blog entry has
a nice description of what is necessary to get J2ME app development on
MacOSX going including antenna support. I figured out most of the stuff
myself before I stumbled over this post (grr).
To get the WTK recognized by eclipse, you need to try and lauch
<wtk-root>/bin/ktoolbar. This will fail since a folder called Mac
is missing. Just rename the existing Linux folder (in the specified
directory) to Mac and this should work. After this EclipseME will be
able to import the WTK as a device profile which you can then use to
build your project.
To debug you can then use MicroEmu in eclipse (as a standard java app rather than using EclipseME)