Programming Language for ROS

According to ROS introduction,

Language independence: the ROS framework is easy to implement in any modern programming language. We have already implemented it in Python, C++, and Lisp, and we have experimental libraries in Java and Lua.

Based on my experience, most of people use C++ and Python.

JSK in University of Tokyo people use Lisp.

In IAI in University of Bremen, Java is one of the main languages.