This is a very simple plugin that prevents items from dropping off of mobs that die from cramming, suffocation or anything else you want to prevent.

Why would you want this?

If you run an economy server or server where items have worth, many players will build massive cramming farms to farm hundreds of stacks of items very quickly. This plugin prevents that so players have to work harder to get the items that drop from mobs.

Commands:
/cdb reload

Permissions:
cdb.reload

The config file lists all the possible ways for a mob to die from damage and whether they should drop items from that damage. You should configure these to fit your needs. I have tried to preconfigure what I think players might abuse to afk farm items, but you should still take a look at them. Damage cause descriptions are listed here: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/event/entity/EntityDamageEvent.DamageCause.html

Config:
IgnoreWorlds: world1,world2
AllowDropsFor:
BLOCK_EXPLOSION: true
CONTACT: false
CRAMMING: false
CUSTOM: false
DRAGON_BREATH: false
DROWNING: false
DRYOUT: true
ENTITY_ATTACK: true
ENTITY_EXPLOSION: true
ENTITY_SWEEP_ATTACK: true
FALL: false
FALLING_BLOCK: false
FIRE: false
FIRE_TICK: false
FLY_INTO_WALL: false
HOT_FLOOR: false
LAVA: false
LIGHTNING: true
MAGIC: true
MELTING: true
POISON: true
PROJECTILE: true
SUFFOCATION: false
THORNS: true
VOID: false
WITHER: true