basically you run water over a hopper and drop items into the water stream and they come out duplicated
1. create a hopper and any chest
2. put a chest down and a hopper above pointing in and make a shoot out of any block and put a water stream running twords the hopper hole
3. throw items into the water stream
4. look in chest and you will see many of the item
Linked issues
duplicates 1
Comments 2

86th duplicate of MC-5998 , please use the search function to see if your bug has already been submitted. Currently over 42% of tickets are being closed as duplicate.
SO. MANY. DUPLICATES!!!!
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