clearPlugins() and clearCommands() for PluginManager and CommandMap respectively

src/main/java/org/bukkit/command/CommandMap.java

@@ -26,4 +26,8 @@ public interface CommandMap {
      */
     public boolean dispatch(Player sender, String cmdLine);
 
+    /**
+     * Clears all registered commands.
+     */
+    public void clearCommands();
 }

src/main/java/org/bukkit/command/SimpleCommandMap.java

@@ -86,6 +86,12 @@ public final class SimpleCommandMap implements CommandMap {
         return isRegisteredCommand;
     }
 
+    public void clearCommands() {
+        synchronized (this) {
+            knownCommands.clear();
+        }
+    }
+
     private static class VersionCommand extends Command {
         private final Server server;
 

src/main/java/org/bukkit/plugin/PluginManager.java

@@ -80,6 +80,11 @@ public interface PluginManager {
      */
     public void disablePlugins();
 
+    /**
+     * Disables and removes all plugins
+     */
+    public void clearPlugins();
+
     /**
      * Calls a player related event with the given details
      *

src/main/java/org/bukkit/plugin/SimplePluginManager.java

@@ -188,6 +188,15 @@ public final class SimplePluginManager implements PluginManager {
         }
     }
 
+    public void clearPlugins() {
+        synchronized (this) {
+            disablePlugins();
+            plugins.clear();
+            lookupNames.clear();
+            listeners.clear();
+        }
+    }
+
     /**
      * Calls a player related event with the given details
      *

src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java

@@ -8,6 +8,7 @@ import java.lang.reflect.Constructor;
 import java.net.URL;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 import java.util.jar.JarEntry;
 import java.util.jar.JarFile;
 import java.util.regex.Pattern;
@@ -301,10 +302,20 @@ public final class JavaPluginLoader implements PluginLoader {
 
         if (plugin.isEnabled()) {
             JavaPlugin jPlugin = (JavaPlugin)plugin;
+            ClassLoader cloader = jPlugin.getClassLoader();
 
             server.getPluginManager().callEvent(new PluginEvent(Event.Type.PLUGIN_DISABLE, plugin));
 
             jPlugin.setEnabled(false);
+
+            if (cloader instanceof PluginClassLoader) {
+                PluginClassLoader loader = (PluginClassLoader)cloader;
+                Set<String> names = loader.getClasses();
+
+                for (String name : names) {
+                    classes.remove(name);
+                }
+            }
         }
     }
 }

src/main/java/org/bukkit/plugin/java/PluginClassLoader.java

@@ -4,6 +4,7 @@ import java.net.URL;
 import java.net.URLClassLoader;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 /**
  * A ClassLoader for plugins, to allow shared classes across multiple plugins
@@ -38,4 +39,8 @@ public class PluginClassLoader extends URLClassLoader {
 
         return result;
     }
+
+    public Set<String> getClasses() {
+        return classes.keySet();
+    }
 }