Good tools/frameworks to develop a game server in Java? [closed]

I am making a game server for a turn based game. Not a web based server, but a process-based one. I want it to be scalable and I want the development process to go as smoothly as possible. I haven't used Java in forever and I need to brush up on my skills, so I really have no idea what is out there framework or tool-wise. Right now it looks like I am going to use Terracotta due to its clustering capabilities. I was just wondering if anything besides this that would make developing a TCP based game server easier?