Jump to content

Keep getting weird Error


Recommended Posts

I keep getting this error: 


java.lang.ArrayIndexOutOfBoundsException: -1
    at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.rehash(Long2ObjectOpenHashMap.java:998)
    at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.removeEntry(Long2ObjectOpenHashMap.java:280)
    at it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap.remove(Long2ObjectOpenHashMap.java:389)
    at net.minecraft.world.biome.BiomeCache.cleanupCache(BiomeCache.java:73)
    at net.minecraft.world.biome.BiomeProvider.cleanupCache(BiomeProvider.java:237)
    at net.minecraft.world.WorldServer.tick(WorldServer.java:195)
    at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:831)
    at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:743)
    at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:192)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:592)
    at java.lang.Thread.run(Thread.java:748)

With a little bit of Googling I found that it is caused by calling world methods asynchronously. But sadly I cannot fix my issue without knowing which method is causing this, because removing asynchrony from my code would cause tremendous performance problems. I was using world methods asynchronously before and didn't get this error.

Link to comment
Share on other sites

Minecraft is pretty much not thread safe. It wasn't written with thread safety in mind and as such can't be treated as if it was. This is but one of the issues you ran into. 

1 hour ago, deerangle said:

I was using world methods asynchronously before and didn't get this error.

If something isn't thread safe and you are using it as if it was it is just a matter of time before you either start running into errors or some weird unintended behaviour emerges.



Minecraft isn't thread safe. You can't assume it is and thus you can't use it as if it was. Stop accessing not thread-safe things asynchronously, that WILL lead to issues because you can't do that.

At best do what you must async and pass what you can't to the main thread to do using IThreadListener#addScheduledTask.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Unfortunately, your content contains terms that we do not allow. Please edit your content to remove the highlighted words below.
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • Create New...

Important Information

By using this site, you agree to our Terms of Use.