How to upgrade Eclipse for Java EE Developers?

Add the update URL to your available sites:

Window > Preferences > Install/Update > Available Software Sites > Add...

    Name:  Oxygen  
Location:  http://download.eclipse.org/releases/oxygen/  

Then tell Eclipse to look for updates: Help > Check for updates.

After the installation, Eclipse will restart and show the old splash screen. Next time you manually stop/start Eclipse it will correctly show the correct splash screen.

You can simply download the newer version, then use "File -> Import -> Install -> From Existing Installation" to add all the plugins you had in your previous installation.

Here's a link describing the whole process in details (it says "on Mac Os X", however it should work for other systems as well):

http://www.corephp.com/blog/how-to-upgrade-eclipse-juno-4-2-to-eclipse-kepler-4-3-on-mac-os-x/#.UfJsoI1_McY