This 'solution' doesn't look to work any longer in the Luna version: Copy path/file name in Eclipse to clipboard
This is actually a must have feature for a rich IDE!
You can use start explorer (alternate link) or Copy path plugin.
Short cut key to copy path to clipboard in star explorer is : Ctrl+Alt+
C
Standard eclipse eclipse doest have such key. You can select resource in Package/Project/Navigator view and press Alt+Enter to open property dialog and then copy path from here.