Uses of Interface
org.bukkit.event.Cancellable

Packages that use Cancellable 
Package Description
org.bukkit.event.block
Events relating to when a block is changed or interacts with the world.
org.bukkit.event.enchantment
Events triggered from an enchantment table.
org.bukkit.event.entity
Events relating to entities, excluding some directly referencing some more specific entity types.
org.bukkit.event.hanging
org.bukkit.event.inventory
Events relating to inventory manipulation.
org.bukkit.event.player
Events relating to players.
org.bukkit.event.raid
Events related to raids.
org.bukkit.event.server
Events relating to programmatic state changes on the server.
org.bukkit.event.vehicle
org.bukkit.event.weather
Events relating to weather.
org.bukkit.event.world
Events triggered by various world states or changes.
org.spigotmc.event.entity
Spigot-specific entity events.