When I discussed with Ben N, he didn't told me anything about server, he has just told simple method. So, I don't have any idea about programming in java and server.

Do I need to install Eclipse?

Python, Swift, Java etc.

Many of the bots we done are in java (but mostly since we that started SOBotics, where java devs)

To dev in java you need and IDE and to start to understand how java work, true not a simple task.

If you are more familiar with another programming language maybe there is a bot framework also in that...