I recently took the plunge back into 64-bit Ubuntu after I originally ditched it two and a half years ago mostly because of desktop Java stuff. I am now using Eclipse 3.6M2 so that compatibility with GTK+ 2.18 is good, but I’ve encountered a problem with native proxy support: my proxy settings were completely ignored [...]

During the Eclipse 3.5 milestones Eclipse gained support for getting proxy settings from Gnome. When 3.5 was finally released this feature was disabled because of Bug 268321 As this bug seems to affect Eclipse running against older versions of GTK+, it is possible to reenable it by adding the following line to eclipse.ini: -Dorg.eclipse.core.net.enableGnome