I finally got eclipse to run again in my amd64 system. This is what I did.
# dpkg --add-architecture i386
Edited my sources.list.d/testing to look like this - (note the [arch=....])
deb [arch=amd64,i386]
http://http.us.debian.org/debian/ testing main non-free contrib
# aptitude update
In the old days....one just installed ia32-libs add ia32-libs-gtk and life was very good. But today, one has to install all the i386 packages manually like this - aptitude install <package-name>:i386 in the normal way. Look at the error messages, hunt for a package, install it, repeat.
512 aptitude install libgtk2.0-0:i386
514 aptitude install libcanberra-gtk-module:i386 libatk-bridge2.0-0:i386 libgail-3-0:i386
518 aptitude install libswt-gtk-3-java:i386
I still got error messages about libgail, so a little hunting....
519 locate libgail.so
520 dpkg -S /usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libgail.so
521 aptitude install libgail-common:i386
Same with atk-bridge
522 locate atk-bridge.so
523 dpkg -S /usr/lib/x86_64-linux-gnu/gtk-2.0/modules/libatk-bridge.so
524 aptitude install libatk-adaptor:i386
Finally, some pixelmap errors -
525 aptitude install gtk2-engines-pixbuf:i386
526 aptitude install gnome-themes-standard:i386
Eclipse 3.7.2 no runs without any warnings or errors.