This is a spawner powered gold farm. It's fully automatic since you can shot one pigman and then every one that spawns will keep going after you so yoiu can afk on it as much as you want. There is one problem though the farm can be way to fast on some cases and make more exp than the player can absorb. To solve that the one that i have made on the server i play i light up a fire in front of 2 of the collection areas to burn the exp since i mostly want the gold and the exp from just the 2 is more than enough.