The Mocha Java blend is the world's oldest blend of coffee. Mocha Java is a blend of Mocha beans from Yemen and Java beans from Indonesia. It all started around the 17th century with the European merchant ships that started their trading in Indonesia; picking up the coffee beans from the island of Java. On their way home, a popular port to stop was Yemen city of Mocha, where they picked up more coffee beans. The trip back home would mix the coffee beans in the bottom of the ships, creating a "blend" of Indonesian and African arabica coffee beans.
 
This creates a contrasting flavor combination of coffee. You have the  bright and fruity African coffees plus the earthy, rich Indonesian beans. Brewhaha Roasters mixes a dark roasted Sumatran bean with a medium roasted Ethiopian bean. This delivers a nice sweetness and body to the cup as well as some bittersweet chocolate flavor notes and roasted nut, earthy undertones.