From 5f98d3fac5033f1065174d8542aeb8b3e44e109e Mon Sep 17 00:00:00 2001
From: Josh Roy <10731363+JRoy@users.noreply.github.com>
Date: Fri, 24 Dec 2021 21:40:41 -0500
Subject: [PATCH] Add mitigation for JDK-8274349 (#4711)

---
 .../java/net/essentialsx/discord/EssentialsDiscord.java    | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/EssentialsDiscord/src/main/java/net/essentialsx/discord/EssentialsDiscord.java b/EssentialsDiscord/src/main/java/net/essentialsx/discord/EssentialsDiscord.java
index 438f8455a..fcc24e099 100644
--- a/EssentialsDiscord/src/main/java/net/essentialsx/discord/EssentialsDiscord.java
+++ b/EssentialsDiscord/src/main/java/net/essentialsx/discord/EssentialsDiscord.java
@@ -36,6 +36,13 @@ public class EssentialsDiscord extends JavaPlugin implements IEssentialsModule {
             getLogger().log(Level.WARNING, tl("versionMismatchAll"));
         }
 
+        // JDK-8274349 - Mitigation for a regression in Java 17 on 1 core systems which was fixed in 17.0.2
+        final String[] javaVersion = System.getProperty("java.version").split("\\.");
+        if (Runtime.getRuntime().availableProcessors() <= 1 && javaVersion[0].startsWith("17") && (javaVersion.length < 2 || (javaVersion[1].equals("0") && javaVersion[2].startsWith("1")))) {
+            logger.log(Level.INFO, "Essentials is mitigating JDK-8274349");
+            System.setProperty("java.util.concurrent.ForkJoinPool.common.parallelism", "1");
+        }
+
         isPAPI = getServer().getPluginManager().getPlugin("PlaceholderAPI") != null;
 
         settings = new DiscordSettings(this);