The Java variety is not the same thing as coffee from the island of Java, and the confusion is constant.
The route
It is an Ethiopian landrace — originally called Abysinia — taken to Indonesia, then to Cameroon in the 1980s, and from there distributed to Latin America.
So a Java variety plant in Panama is genetically Ethiopian, and has nothing to do with Indonesian Java coffee.
The profile
Floral and elegant with a clean, sweet character and good acidity — closer to an Ethiopian heirloom than to the Bourbon–Typica family that dominates Latin America.
That is exactly what you would expect, given where it came from.
Why producers plant it
Cup quality, principally. It has become a favourite among quality-focused growers in Panama, Ecuador, Nicaragua and Costa Rica.
Some rust tolerance, which is unusual among high-quality varieties.
Tall and elegant, with long internodes, which makes it easy to identify in a field.
Where it grows
Panama, Ecuador, Nicaragua, Costa Rica and increasingly elsewhere in Central America. It is a variety on the way up.
Brewing it
Filter, light roast, a clean brewer. Treat it as you would an Ethiopian washed coffee.