This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I don't really go over or recommend any particular IDE plugins but I do mention some code coverage tools by name, for example.
Personally, I usually go for Cobertura because it's free, it's open source, and it creates pretty reports. However, I use it as part of a build rather than through the IDE. In fact, I'm not even aware of an Eclipse Cobertura plugin so please point out if there is one.