Definition of "java"

45 have some joe Week's almost over—now bring it home. Austrian researchers found that a cup of java resulted in a 45-minute boost of brain activity in the regions responsible for attention, concentration, and short-term memory.

2008 January–February, “70 Ways to Improve Every Day of the Week”, in Men's Health, volume 23, number 1, page 135

The java is the dance of the moment among a certain less desirable crowd, and this prohibition is enough to keep out the desperadoes who foregather every afternoon at the Petit-Balcon dance hall down the street.

2015, Luc Sante, The Other Paris: An illustrated journey through a city's poor and Bohemian past‎, Faber & Faber