Chunk unloading

[SrBlecaute01]

Apparently I have this problem when unloading the chunk.

[18:57:35] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_8_R3.ReportedException: Exception ticking world
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:945) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:365) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:823) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:724) [Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at java.lang.Thread.run(Thread.java:750) [?:1.8.0_332]
Caused by: java.lang.NullPointerException
    at it.unimi.dsi.fastutil.longs.LongOpenHashSet$SetIterator.nextLong(LongOpenHashSet.java:535) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at net.minecraft.server.v1_8_R3.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:444) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:236) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:934) ~[Rankup.jar:git-SportPaper-8de3fda-P.178a2af-SP.28dc63d-CB.e1ebe52]
    ... 4 more

Seeing the last commits I realized that this error should be fixed by pr #116 or I could be wrong.

crash-2022-07-30_18.57.35-server.txt

[Pablete1234]

I've looked into this a bit, and i'm pretty certain it's related to one of your own plugins, as it's getting into a state it should never get to. Is it possible that any of your plugins handles a ChunkUnloadEvent and does some action that modifies the chunk unload queue in any way (ie: modifying other chunks?)

Regardless, i've not been able to reproduce the issue

[SrBlecaute01]

Since it's been a while, I don't think I can reproduce the error again. If I'm not mistaken, I reversed the commit changes and put the default Map used by the paper and the crash stopped happening. I wonder if the error really would be due to modifications.

Also, I don't recall any plugin changing blocks on its offload, just removing entities, but I don't think that should crash the server.

[nathanosoares]

The same crash happened on my server. The only plugin in common is FAWE.

[02:48:45] [Server thread/INFO]: test3[/127.0.0.1:59367] logged in with entity id 1294370 at ([world]0.5, 97.0, 0.5)
[02:49:15] [Server thread/INFO]: LeoRufo lost connection: Disconnected
[02:49:35] [Thread-19/INFO]: UUID of player mntor1 is 323f1823-c921-3bf2-ad57-d7d6ce7ce756
[02:49:35] [Server thread/INFO]: mntor1[/127.0.0.1:38233] logged in with entity id 1307916 at ([world]-1.5, 97.0, -1.5)
[02:49:37] [Server thread/ERROR]: Encountered an unexpected exception
net.minecraft.server.v1_8_R3.ReportedException: Exception ticking world
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:949)
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:376)
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:827)
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:728)
	at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.longs.LongArrayList.getLong(int)" because "this.wrapped" is null
	at it.unimi.dsi.fastutil.longs.LongOpenHashSet$SetIterator.nextLong(LongOpenHashSet.java:535)
	at net.minecraft.server.v1_8_R3.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:442)
	at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:236)
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:938)
	... 4 more
[02:49:37] [Server thread/ERROR]: 	Cause of unexpected exception was
java.lang.NullPointerException: Cannot invoke "it.unimi.dsi.fastutil.longs.LongArrayList.getLong(int)" because "this.wrapped" is null
	at it.unimi.dsi.fastutil.longs.LongOpenHashSet$SetIterator.nextLong(LongOpenHashSet.java:535)
	at net.minecraft.server.v1_8_R3.ChunkProviderServer.unloadChunks(ChunkProviderServer.java:442)
	at net.minecraft.server.v1_8_R3.WorldServer.doTick(WorldServer.java:236)
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:938)
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:376)
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:827)
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:728)
	at java.base/java.lang.Thread.run(Thread.java:840)

crash-2025-07-25_02.49.37-server.txt