I also just upgraded from Karmic to Lucid (64 bit) and had the same problem. This command also solves it:
sudo ln -s /usr/share/java/swt-gtk-3.5.1.jar /usr/share/java/swt.jar
I also just upgraded from Karmic to Lucid (64 bit) and had the same problem. This command also solves it:
sudo ln -s /usr/share/ java/swt- gtk-3.5. 1.jar /usr/share/ java/swt. jar