Language Details: J

J is a modern, high-level, general-purpose, high-performance programming language.

Official website (see also: Wikipedia article)
Code Jam 2012 Contestants using J
Qualification Round
Used in 10 solutions by 3 contestants:
Round 1A
Used in 1 solutions by 1 contestants:

Submission Origin

Greece (1 contestant)
Japan (1 contestant)
United States (1 contestant)