Identify and warn if a plugin hijacks the command map

src/main/java/co/aikar/commands/ACFLog.java

@@ -31,6 +31,7 @@ import java.util.logging.Logger;
 @SuppressWarnings("WeakerAccess")
 final class ACFLog {
     private static final Logger LOGGER = Bukkit.getLogger();
+    public static final String PREFIX = "[ACF] ";
 
     private ACFLog() {}
 
@@ -42,19 +43,19 @@ final class ACFLog {
 
     public static void info(String message) {
         for (String s : ACFPatterns.NEWLINE.split(message)) {
-            LOGGER.info(s);
+            LOGGER.info(PREFIX + s);
         }
     }
 
     public static void warn(String message) {
         for (String s : ACFPatterns.NEWLINE.split(message)) {
-            LOGGER.warning(s);
+            LOGGER.warning(PREFIX + s);
         }
     }
 
     public static void severe(String message) {
         for (String s : ACFPatterns.NEWLINE.split(message)) {
-            LOGGER.severe(s);
+            LOGGER.severe(PREFIX + s);
         }
     }
 
@@ -89,7 +90,7 @@ final class ACFLog {
         final StackTraceElement[] stack = dbg.getStackTrace();
         for (int i = 0; i < lines && i < stack.length; i++) {
             final StackTraceElement cur = stack[i];
-            Logger.getGlobal().severe("  " + cur);
+            severe("  " + cur);
         }
     }
 }

src/main/java/co/aikar/commands/BukkitCommandManager.java

@@ -28,6 +28,7 @@ import org.bukkit.Bukkit;
 import org.bukkit.Server;
 import org.bukkit.command.Command;
 import org.bukkit.command.CommandMap;
+import org.bukkit.command.SimpleCommandMap;
 import org.bukkit.event.EventHandler;
 import org.bukkit.event.Listener;
 import org.bukkit.event.server.PluginDisableEvent;
@@ -58,6 +59,10 @@ public class BukkitCommandManager extends CommandManager {
             Method getCommandMap = server.getClass().getDeclaredMethod("getCommandMap");
             getCommandMap.setAccessible(true);
             commandMap = (CommandMap) getCommandMap.invoke(server);
+            if (!commandMap.getClass().equals(SimpleCommandMap.class)) {
+                ACFLog.severe("ERROR: CommandMap has been hijacked! Offending command map is located at: " + commandMap.getClass().getName());
+                ACFLog.severe("Commands are most likely broken unless the hijacker did it in a friendly way.");
+            }
             Field knownCommands = commandMap.getClass().getDeclaredField("knownCommands");
             knownCommands.setAccessible(true);
             //noinspection unchecked