Warn if PermGen may be insufficient. Since 1.7 Mojang added a lot of new classes to their jar. This, coupled with plugins, may cause the loaded classes to exceed the default perm gem of 64mb. As such we will print a small warning advising users to set a higher PermGen if they haven't already.

CraftBukkit-Patches/0084-Warn-if-PermGen-may-be-insufficient.patch

@@ -0,0 +1,34 @@
+From 1fdd743f7d9574e16efdc4831324a18d7847dc47 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 07c26f1..9952087 100644
+--- a/src/main/java/org/bukkit/craftbukkit/Main.java
++++ b/src/main/java/org/bukkit/craftbukkit/Main.java
+@@ -149,6 +149,20 @@ public class Main {
+                     useConsole = false;
+                 }
+ 
++                // Spigot Start
++                int maxPermGen = 0;
++                for ( String s : java.lang.management.ManagementFactory.getRuntimeMXBean().getInputArguments() )
++                {
++                    if ( s.startsWith( "-XX:MaxPermSize" ) )
++                    {
++                        maxPermGen = Integer.parseInt( s.replaceAll( "[^\\d]", "" ) );
++                    }
++                }
++                if ( maxPermGen < 128 )
++                {
++                    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" );
++                }
++                // Spigot End
+                 System.out.println("Loading libraries, please wait...");
+                 MinecraftServer.main(options);
+             } catch (Throwable t) {
+-- 
+1.8.3.2
+