From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 1 May 2018 21:33:35 -0400
Subject: [PATCH] Close Plugin Class Loaders on Disable

This should close more memory leaks from /reload and disabling plugins,
by closing the class loader and the jar file.

Note: This patch is no longer necessary as upstream now also closes
PluginClassLoaders on disable. This patch is now only to keep around
API methods it previously added, and to add back the log message when a
PluginClassLoader fails to disable, as upstream decided to ignore the
exception.

diff --git a/src/main/java/org/bukkit/plugin/PluginLoader.java b/src/main/java/org/bukkit/plugin/PluginLoader.java
index cb530369e667c426c842da356c31304bb5c3ecfa..a11515b81575fc42c771a218a81fea8f05d2289d 100644
--- a/src/main/java/org/bukkit/plugin/PluginLoader.java
+++ b/src/main/java/org/bukkit/plugin/PluginLoader.java
@@ -78,4 +78,21 @@ public interface PluginLoader {
      * @param plugin Plugin to disable
      */
     public void disablePlugin(@NotNull Plugin plugin);
+
+    // Paper start - close Classloader on disable
+    /**
+     * This method is no longer useful as upstream has
+     * made it so plugin classloaders are always closed on disable.
+     * Use {@link #disablePlugin(Plugin)} instead.
+     *
+     * @param plugin Plugin to disable
+     * @param closeClassloader unused
+     * @deprecated Classloader is always closed by upstream now.
+     */
+    @Deprecated(forRemoval = true)
+    // provide default to allow other PluginLoader implementations to work
+    default public void disablePlugin(@NotNull Plugin plugin, boolean closeClassloader) {
+        disablePlugin(plugin);
+    }
+    // Paper end - close Classloader on disable
 }
diff --git a/src/main/java/org/bukkit/plugin/PluginManager.java b/src/main/java/org/bukkit/plugin/PluginManager.java
index 03213fde8315384ec56c16031cfc606ade2e8091..94fef99525a3613dcc313a0d0b03e47a91d4117b 100644
--- a/src/main/java/org/bukkit/plugin/PluginManager.java
+++ b/src/main/java/org/bukkit/plugin/PluginManager.java
@@ -162,6 +162,22 @@ public interface PluginManager extends io.papermc.paper.plugin.PermissionManager
      */
     public void disablePlugin(@NotNull Plugin plugin);
 
+    // Paper start - close Classloader on disable
+    /**
+     * This method is no longer useful as upstream has
+     * made it so plugin classloaders are always closed on disable.
+     * Use {@link #disablePlugin(Plugin)} instead.
+     *
+     * @param plugin Plugin to disable
+     * @param closeClassloader unused
+     * @deprecated Classloader is always closed by upstream now.
+     */
+    @Deprecated(forRemoval = true)
+    public default void disablePlugin(@NotNull Plugin plugin, boolean closeClassloader) {
+        this.disablePlugin(plugin);
+    }
+    // Paper end - close Classloader on disable
+
     /**
      * Gets a {@link Permission} from its fully qualified name
      *
diff --git a/src/main/java/org/bukkit/plugin/SimplePluginManager.java b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
index 2b8308989fce7f8a16907f8711b362e671fdbfb6..f96164a2bc4e042bdd7c6045a9b392ad4e4dbea7 100644
--- a/src/main/java/org/bukkit/plugin/SimplePluginManager.java
+++ b/src/main/java/org/bukkit/plugin/SimplePluginManager.java
@@ -532,6 +532,21 @@ public final class SimplePluginManager implements PluginManager {
         }
     }
 
+    // Paper start
+    /**
+     * This method is no longer useful as upstream has
+     * made it so plugin classloaders are always closed on disable.
+     * Use {@link #disablePlugins()} instead.
+     *
+     * @param closeClassloaders unused
+     * @deprecated Classloader is always closed by upstream now.
+     */
+    @Deprecated(forRemoval = true)
+    public void disablePlugins(boolean closeClassloaders) {
+        this.disablePlugins();
+    }
+    // Paper end
+
     @Override
     public void disablePlugin(@NotNull final Plugin plugin) {
         if (true) {this.paperPluginManager.disablePlugin(plugin); return;} // Paper
diff --git a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
index ac1c884e950ce13e9e7b3a7be1378808012fafc4..e0423adf45bf5855c23259257863f67cec1c3d54 100644
--- a/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
+++ b/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
@@ -368,6 +368,7 @@ public final class JavaPluginLoader implements PluginLoader {
                     loader.close();
                 } catch (IOException ex) {
                     //
+                    this.server.getLogger().log(Level.WARNING, "Error closing the PluginClassLoader for '" + plugin.getDescription().getFullName() + "'", ex); // Paper - log exception
                 }
             }
         }