I think that question is self-explained :-)
When I browse to Application eclipse send me an error.
I posted the answer on another question like this on stackoverflow, so here it goes:
I found the solution in a blog's post that doesn't exist anymore, it involves configuring the Location to be '/usr/bin/open' and the parameter is '%URL%'.
You need to make sure that google chrome is your default browser and it will work properly. This is the only method that worked for me on OSX Lion.