From 77ffdd04752690b4b11241190944f6309cd1eb98 Mon Sep 17 00:00:00 2001
From: Ghost_chu <2908803755@qq.com>
Date: Thu, 28 Mar 2019 21:35:47 +0800
Subject: [PATCH] Fix `java.lang.IllegalArgumentException` crash issue.

This bug will cause server crash, and these lines will shown in crash-report.

```
Description: Exception in server tick loop

java.lang.ExceptionInInitializerError
	at net.minecraft.server.v1_13_R2.PlayerList.sendAll(PlayerList.java:1099)
	at net.minecraft.server.v1_13_R2.World$2.a(World.java:226)
	at net.minecraft.server.v1_13_R2.WorldBorder.setCenter(WorldBorder.java:94)
	at net.minecraft.server.v1_13_R2.WorldServer.i_(WorldServer.java:112)
	at net.minecraft.server.v1_13_R2.MinecraftServer.a(MinecraftServer.java:367)
	at net.minecraft.server.v1_13_R2.DedicatedServer.init(DedicatedServer.java:316)
	at net.minecraft.server.v1_13_R2.MinecraftServer.run(MinecraftServer.java:789)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.IllegalArgumentException
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1314)
	at java.util.concurrent.ThreadPoolExecutor.<init>(ThreadPoolExecutor.java:1237)
	at java.util.concurrent.Executors.newFixedThreadPool(Executors.java:151)
	at io.akarin.server.core.AkarinAsyncExecutor.<clinit>(AkarinAsyncExecutor.java:12)
	... 8 more

```
---
 .../io/akarin/server/core/AkarinAsyncExecutor.java  | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/src/main/java/io/akarin/server/core/AkarinAsyncExecutor.java b/src/main/java/io/akarin/server/core/AkarinAsyncExecutor.java
index a700ea0b4..3a54d64ba 100644
--- a/src/main/java/io/akarin/server/core/AkarinAsyncExecutor.java
+++ b/src/main/java/io/akarin/server/core/AkarinAsyncExecutor.java
@@ -9,8 +9,17 @@ import com.google.common.util.concurrent.ThreadFactoryBuilder;
 
 public class AkarinAsyncExecutor {
     private static final ExecutorService singleExecutor = Executors.newSingleThreadExecutor(new ThreadFactoryBuilder().setNameFormat("Akarin Single Async Executor Thread - %1$d").build());
-    private static final ExecutorService asyncExecutor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors() / 4, new ThreadFactoryBuilder().setNameFormat("Akarin Async Executor Thread - %1$d").build());
-    
+    private static final ExecutorService asyncExecutor = Executors.newFixedThreadPool(getnThreads(), new ThreadFactoryBuilder().setNameFormat("Akarin Async Executor Thread - %1$d").build());
+
+    private static int getnThreads(){
+        int processors = Runtime.getRuntime().availableProcessors();
+        if(processors > 2){
+            return processors;
+        }else {
+            return 2;
+        }
+    }
+
     /**
      * Posts a task to be executed asynchronously in a single thread
      * @param run