i recently tried to implement a monte carlo ai for four in a row, so i thought i'll give this a try
Is it possible to upload bots in JAVA?
I'm pretty sure that it is! :)
They normally support around 11 languages for their competitions:
C
Clojure
Common Lisp
C++
C#
D
Elixir
Go
Haskell
Java
JavaScript
Lua
Pascal
Perl
PHP
Prolog
Python
Python 3
Ruby
Rust
Scala
Tcl