Custom Minecraft 1.8 spawners

I am working on a minecraft 1.8 server and am trying to make a mob spawner that spawns items. This example:How can I make a spawner that summons Items? wo...

Comparator won't work

I am trying to make a "Zombies" map and you need five rotten flesh to open the door. I made hopper to put the items in the chest with a comparator to powe...