Provide a useful PluginClassLoader#toString

There are several cases where the plugin classloader may be dumped to the logs,
however, this provides no indication of the owner of the classloader, making
these messages effectively useless, this patch rectifies this

Spigot-API-Patches/0209-Provide-a-useful-PluginClassLoader-toString.patch

@@ -0,0 +1,30 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Shane Freeder <theboyetronic@gmail.com>
+Date: Sun, 31 May 2020 15:26:17 +0100
+Subject: [PATCH] Provide a useful PluginClassLoader#toString
+
+There are several cases where the plugin classloader may be dumped to the logs,
+however, this provides no indication of the owner of the classloader, making
+these messages effectively useless, this patch rectifies this
+
+diff --git a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+index 28e5c6591fb594ca79ee92480cedc8f549e3fe01..62f7a6817da079513f471e36cd79739d36a36d86 100644
+--- a/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
++++ b/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+@@ -209,4 +209,16 @@ public final class PluginClassLoader extends URLClassLoader { // Spigot
+         javaPlugin.logger = this.logger; // Paper - set logger
+         javaPlugin.init(loader, loader.server, description, dataFolder, file, this);
+     }
++
++    // Paper start
++    @Override
++    public String toString() {
++        JavaPlugin currPlugin = plugin != null ? plugin : pluginInit;
++        return "PluginClassLoader{" +
++                   "plugin=" + currPlugin +
++                   ", pluginEnabled=" + (currPlugin == null ? "uninitialized" : currPlugin.isEnabled()) +
++                   ", url=" + file +
++                   '}';
++    }
++    // Paper end
+ }