| Reason | Description |
|---|---|
NATURAL
|
When something spawns from natural means. |
JOCKEY
|
When an entity spawns as a jockey of another entity (mostly spider jockeys) |
CHUNK_GEN
|
When a creature spawns due to chunk generation. |
SPAWNER
|
When a creature spawns from a spawner. |
EGG
|
When a creature spawns from an egg. |
SPAWNER_EGG
|
When a creature spawns from a Spawner Egg. |
LIGHTNING
|
When a creature spawns because of a lightning strike. |
BUILD_SNOWMAN
|
When a snowman is spawned by being built. |
BUILD_IRONGOLEM
|
When an iron golem is spawned by being built. |
BUILD_WITHER
|
When a wither boss is spawned by being built. |
VILLAGE_DEFENSE
|
When an iron golem is spawned to defend a village. |
VILLAGE_INVASION
|
When a zombie is spawned to invade a village. |
BREEDING
|
When an animal breeds to create a child. |
SLIME_SPLIT
|
When a slime splits. |
REINFORCEMENTS
|
When an entity calls for reinforcements. |
NETHER_PORTAL
|
When a creature is spawned by nether portal. |
DISPENSE_EGG
|
When a creature is spawned by a dispenser dispensing an egg. |
INFECTION
|
When a zombie infects a villager. |
CURED
|
When a villager is cured from infection. |
OCELOT_BABY
|
When an ocelot has a baby spawned along with them. |
SILVERFISH_BLOCK
|
When a silverfish spawns from a block. |
MOUNT
|
When an entity spawns as a mount of another entity (mostly chicken jockeys) |
TRAP
|
When an entity spawns as a trap for approaching player(s). |
CUSTOM
|
When a creature is spawned by plugins. |
DEFAULT
|
When an entity is missing a SpawnReason. |
Copied from: bukkit docs - Spawn Reason
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