First of all, anyone who is interested in a brief history of coffee should see the Nat Geo special— From Beans to Buzz: The Whole History of Coffee (well, most of it). Here’s a different PBS special, the first part, that tells some of the story.
Coffee, after oil is the most valuable traded commodity in the world. Why? Because 500 billion cups are drunk a year, half of them at breakfast! 25 million people at least make their livelihood from coffee. Generally, speaking there is agreement that coffee originated in Ethiopia growing wild in its hills. The coffee cherries or beans were probably chewed first, and at least as early as the 1400s the beans were being roasted, and made into a beverage. The story I prefer is that this first happened in an Ethiopian monastery, where shivering monks in the desert needed to warm up and perk up, literally! We know that the monks shared the art with other monks. For example, cappucino comes from the Cappuchin monks, and is even the color of their robes! Hence, it gains the reputation of being a genuinely Christian beverage, though Christians probably were not the only early creators of the beverage. For the original Christian beverage we would have to go with wine— which famously Jesus turned water into. But that is a story for another day.
P.S. Coffee is called Java, because of course that’s one place it comes from— modern day Indonesia.