Uses of Interface
org.bukkit.inventory.InventoryHolder

Packages that use InventoryHolder 
Package Description
org.bukkit
More generalized classes in the API.
org.bukkit.block
Classes used to manipulate the voxels in a world, including special states.
org.bukkit.entity
Interfaces for non-voxel objects that can exist in a world, including all players, monsters, projectiles, etc.
org.bukkit.entity.minecart
Interfaces for various Minecart types.
org.bukkit.inventory
Classes involved in manipulating player inventories and item interactions.