|Looking for something a little easier on the eyes?|
1) Install the eclipse color theme plugin. Help->Eclipse Marketplace...->Search for "Eclipse Color Theme". Select a dark theme (or really any one of your choosing). You might notice some elements are not being colored correctly however, namely brackets and operators. To fix these last few elements we can manually change their color to something that suits.
2) Window->Preferences->Groovy->Editor. In this settings page you will find the rest of the settings you need to change. Set the operator, bracket colors to something more visible (and any other fine tweaks you may wish)