Experience orbs

[onbjerg]

The implementation of spawning and collection of XP orbs

[scifi6546]

It looks like exp orbs can spawn from killing mobs, breaking ores, and dropping bottle of enchanting. After that they can either de spawn or be collected by a player

[scifi6546]

and it looks like experience orb spawn packets have to be handled differently. A separate spawn packet specific to entity orbs has to be sent. See https://wiki.vg/Protocol#Spawn_Experience_Orb for more information.

[OvermindDL1]

I know the furnace can give experience too, but I'm unsure if it gives it directly, or if it drops orbs when pulling out the result.