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Bug
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Resolution: Fixed
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Minecraft 1.8.8, Minecraft 15w39c, Minecraft 15w40b, Minecraft 15w45a, Minecraft 15w47c, Minecraft 15w51b, Minecraft 1.9.4, Minecraft 16w35a, Minecraft 1.11, Minecraft 1.11.2, Minecraft 17w06a, Minecraft 1.12 Pre-Release 5, Minecraft 1.12 Pre-Release 7, Minecraft 1.12, Minecraft 18w05a, Minecraft 1.14.3 Pre-Release 2, 1.14.4, 19w38b, 1.15.2, 20w15a, 1.16.2, 1.16.3, 1.16.4, 20w46a
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Confirmed
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Crash
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Very Important
A spawner with SpawnPotentials containing an entry with a Weight of 0 causes the game (or server) to crash:
/setblock ~ ~ ~ spawner{Delay:-1,SpawnPotentials:[{Weight:0,Entity:{id:pig}}]}
Crash log attached.
1.14.3 pre-2
Description: Ticking block entity java.lang.IllegalArgumentException at aaf.a(SourceFile:18) at aaf.a(SourceFile:37) at bgs.i(SourceFile:179) at bgs.c(SourceFile:91) at bup.T_(SourceFile:62) at bhl.K(SourceFile:625) at vi.a(SourceFile:402) at net.minecraft.server.MinecraftServer.b(SourceFile:824) at net.minecraft.server.MinecraftServer.a(SourceFile:763) at dxn.a(SourceFile:128) at net.minecraft.server.MinecraftServer.run(SourceFile:631) at java.lang.Thread.run(Thread.java:745)
The reason for this is that the game throws a IllegalArgumentException in case the sum of all weights is <= 0. This means this bug is also caused when negative weights are provided or when the weights overflow:
setblock ~ ~1 ~ mob_spawner 0 replace {Delay:-1s,MinSpawnDelay:3s,MaxSpawnDelay:3s,SpawnPotentials:[{Entity:{id:armor_stand},Weight:2147483647},{Entity:{id:armor_stand},Weight:1}]}
This affects also loot tables but only if the weight sum overflows. There it does not crash but prints the exception in the log only.
