From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: foss-mc <69294560+foss-mc@users.noreply.github.com>
Date: Thu, 1 Jul 2021 12:17:44 +0000
Subject: [PATCH] Don't create new random instance

Original code by PatinaMC, licensed under GNU General Public License v3.0
You can find the original code on https://github.com/PatinaMC/Patina

diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index ca5291a9573a62cb5c19539cf5c7aceff11f9829..5f3658625c05e9e1ff3e4685ce4cb5f6eb66cc49 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -396,7 +396,7 @@ public class ServerPlayer extends Player {
             long l = k * k;
             int i1 = l > 2147483647L ? Integer.MAX_VALUE : (int) l;
             int j1 = this.getCoprime(i1);
-            int k1 = RandomSource.create().nextInt(i1);
+            int k1 = worldserver.random.nextInt(i1); // Patina - don't create new random instance
 
             for (int l1 = 0; l1 < i1; ++l1) {
                 int i2 = (k1 + j1 * l1) % i1;
@@ -433,7 +433,7 @@ public class ServerPlayer extends Player {
             long l = k * k;
             int i1 = l > 2147483647L ? Integer.MAX_VALUE : (int) l;
             int j1 = this.getCoprime(i1);
-            int k1 = RandomSource.create().nextInt(i1);
+            int k1 = world.random.nextInt(i1); // Patina - don't create new random instance
 
             for (int l1 = 0; l1 < i1; ++l1) {
                 int i2 = (k1 + j1 * l1) % i1;
diff --git a/src/main/java/net/minecraft/server/rcon/thread/QueryThreadGs4.java b/src/main/java/net/minecraft/server/rcon/thread/QueryThreadGs4.java
index 1ef089dbf83de35d875c00efdf468c397be56978..c345f10cbf7f3451edc604f97cdf959d70639e17 100644
--- a/src/main/java/net/minecraft/server/rcon/thread/QueryThreadGs4.java
+++ b/src/main/java/net/minecraft/server/rcon/thread/QueryThreadGs4.java
@@ -349,7 +349,7 @@ public class QueryThreadGs4 extends GenericThread {
             this.identBytes[2] = bs[5];
             this.identBytes[3] = bs[6];
             this.ident = new String(this.identBytes, StandardCharsets.UTF_8);
-            this.challenge = RandomSource.create().nextInt(16777216);
+            this.challenge = java.util.concurrent.ThreadLocalRandom.current().nextInt(16777216); // Patina - don't create new random instance
             this.challengeBytes = String.format(Locale.ROOT, "\t%s%d\u0000", this.ident, this.challenge).getBytes(StandardCharsets.UTF_8);
         }