Okay I have found it...
The problem was in my eclipse.ini
file, which looked like this:
-startup
plugins/org.eclipse.equinox.launcher_1.3.0.v20120522-1813.jar
--launcher.library
plugins/org.eclipse.equinox.launcher.gtk.linux.x86_64_1.1.200.v20120913-144807
-showsplash
org.eclipse.platform
--launcher.XXMaxPermSize
256m
--launcher.defaultAction
openFile
-Xms40m
-Xmx512m
-vmargs
-Djava.library.path="/usr/lib/x86_64-linux-gnu/jni"
I had to remove the extra quotes: -Djava.library.path="/usr/lib/x86_64-linux-gnu/jni"
to -Djava.library.path=/usr/lib/x86_64-linux-gnu/jni
.
That fixed it.