From 4655ad979edf64817ec2b39c74440642a7bdf9a2 Mon Sep 17 00:00:00 2001 From: Brokkonaut Date: Fri, 20 Oct 2017 04:33:45 +0200 Subject: [PATCH] Replace HashSet with fastutil's ObjectOpenHashSet in HashTreeSet HashSet sometimes uses compareTo() instead of equals() and this breaks the comparison of net.minecraft.server.NextTickListEntry (the only place where HashTreeSet is used). In this cases duplicate entries could be added to the HashSet of HashTreeSet, because NextTickListEntry.compareTo() does not return 0, even if NextTickListEntry.equals() returns true. ObjectOpenHashSet never uses compareTo(), so the inconsistencies of NextTickListEntry cause no problems. Fixes https://github.com/PaperMC/Paper/issues/588 diff --git a/src/main/java/org/bukkit/craftbukkit/util/HashTreeSet.java b/src/main/java/org/bukkit/craftbukkit/util/HashTreeSet.java index 80a5c29f3b..cd864c4047 100644 --- a/src/main/java/org/bukkit/craftbukkit/util/HashTreeSet.java +++ b/src/main/java/org/bukkit/craftbukkit/util/HashTreeSet.java @@ -8,7 +8,7 @@ import java.util.TreeSet; public class HashTreeSet implements Set { - private HashSet hash = new HashSet(); + private Set hash = new it.unimi.dsi.fastutil.objects.ObjectOpenHashSet(); //Paper - Replace java.util.HashSet with ObjectOpenHashSet private TreeSet tree = new TreeSet(); public HashTreeSet() { -- 2.19.0