Problem:
EntityDamageEvent and EntityDamageByBlockEvent don't trigger when item entities / dropped items get damaged, for example by cactus.

It seems there is just a craftbukkit event handler for that in the LivingEntity class, but EntityItem doesn't trigger that event (or any own event to handle this)

Reproduce:
Watch events and drop some stuff on cactus.

Possible Solution:
Call CraftEventFactory.handleNonLivingEntityDamageEvent(this, damagesource, f) in net.minecraft.server.EntityItem.damageEntity method, as already used in some other non-living entity classes (ArmorStand or ItemFrame).