I know this is not programming related. But I can't find any topics on Google or UbuntuForums.
So the problem is:
When gnome-screensaver starts on the moment Eclipse has the focus and I wake up again my laptop, Eclipse doesn't listen to keyboard-events. To solve this I have to change the focus to another program and then back to Eclipse. Than it works again.
This isn't a real problem, but it would be nice if someone can solve it.