If you cannot see anymore menus in Eclipse after installing/upgrading to Ubuntu Saucy 13.10, you can use the environment variable UBUNTU_MENUPROXY before launching Eclipse.
You have to set it to an empty value to indicate you want to use the classic menu of Eclipse and not the one integrated to Ubuntu Unity.
For example, in your eclipse.desktop, do the following:
[Desktop Entry] name=Eclipse Type=Application Icon=[path to Eclipse icon] Exec=env UBUNTU_MENUPROXY= [Path to Eclipse executable]
The white space, right after UBUNTU_MENUPROXY=, is important.
You can also set the environment variable in a terminal and launch Eclipse from this terminal.
If you want more information about the bug, read details on https://bugs.launchpad.net/ubuntu/+source/indicator-appmenu/+bug/659931.
