From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Spottedleaf Date: Mon, 15 May 2023 00:20:59 -0700 Subject: [PATCH] Fix concurrenct access to lookups field in RegistryOps The concurrent access occurs on the Netty IO threads when serializing packets. Thus, it seems it was an oversight of the implementator of this function as there are typically more than one Netty IO thread. Fixes https://github.com/PaperMC/Folia/issues/11 diff --git a/src/main/java/net/minecraft/resources/RegistryOps.java b/src/main/java/net/minecraft/resources/RegistryOps.java index 7709eeac907c4895a264cec0a3d453aa8b194c18..4495802efec958095bcfd41487b30c3c799d7b36 100644 --- a/src/main/java/net/minecraft/resources/RegistryOps.java +++ b/src/main/java/net/minecraft/resources/RegistryOps.java @@ -19,11 +19,11 @@ public class RegistryOps extends DelegatingOps { private static RegistryOps.RegistryInfoLookup memoizeLookup(final RegistryOps.RegistryInfoLookup registryInfoGetter) { return new RegistryOps.RegistryInfoLookup() { - private final Map>, Optional>> lookups = new HashMap<>(); + private final Map>, Optional>> lookups = new java.util.concurrent.ConcurrentHashMap<>(); // Paper - fix concurrent access to lookups field @Override public Optional> lookup(ResourceKey> registryRef) { - return this.lookups.computeIfAbsent(registryRef, registryInfoGetter::lookup); + return (Optional>)this.lookups.computeIfAbsent(registryRef, registryInfoGetter::lookup); // Paper - fix concurrent access to lookups field } }; }