My Nexenta upgrade coincided nicely with the release of Eclipse 3.4M5. Because I had to re-install Eclipse anyway, and because a shiny new Nexenta install deserves nothing less than the latest-and-greatest Eclipse release, I downloaded the M5 source, installed the Eclipse build dependencies, ran my 3.4M4 modification script and with a few minor tweaks was quickly able to get Ganymede up and running, Java editor bread-crumb saccharine and all.
The script for building Eclipse 3.4 M5 for solaris-gtk-x86 can be downloaded from the solipse downloads page. Please be aware of the Nexenta-specific instructions for building the SWT library with gcc instead of SunStudio cc.

Breadcrumbs in the Java Editor are one of the sauciest additions to this latest release. Even though they do not add functionality that is not already in the workbench and they occupy precious screen real estate, they are great eye candy.