From 75a2543c83ce99ca4c1b60a45c6caca5d604adeb Mon Sep 17 00:00:00 2001
From: md_5 <git@md-5.net>
Date: Mon, 23 Dec 2013 14:07:41 +1100
Subject: [PATCH] Warn if PermGen may be insufficient


diff --git a/src/main/java/org/bukkit/craftbukkit/Main.java b/src/main/java/org/bukkit/craftbukkit/Main.java
index 4e642b7..c5bc388 100644
--- a/src/main/java/org/bukkit/craftbukkit/Main.java
+++ b/src/main/java/org/bukkit/craftbukkit/Main.java
@@ -165,6 +165,22 @@ public class Main {
                     useConsole = false;
                 }
 
+                // Spigot Start
+                int maxPermGen = 0; // In kb
+                for ( String s : java.lang.management.ManagementFactory.getRuntimeMXBean().getInputArguments() )
+                {
+                    if ( s.startsWith( "-XX:MaxPermSize" ) )
+                    {
+                        maxPermGen = Integer.parseInt( s.replaceAll( "[^\\d]", "" ) );
+                        maxPermGen <<= 10 * ("kmg".indexOf( Character.toLowerCase( s.charAt( s.length() - 1 ) ) ) );
+                    }
+                }
+                if ( Float.parseFloat( System.getProperty( "java.class.version" ) ) < 52 && maxPermGen < ( 128 << 10 ) ) // 128mb
+                {
+                    System.out.println( "Warning, your max perm gen size is not set or less than 128mb. It is recommended you restart Java with the following argument: -XX:MaxPermSize=128M" );
+                    System.out.println( "Please see http://www.spigotmc.org/wiki/changing-permgen-size/ for more details and more in-depth instructions." );
+                }
+                // Spigot End
                 System.out.println("Loading libraries, please wait...");
                 MinecraftServer.main(options);
             } catch (Throwable t) {
-- 
2.1.0