diff --git a/src/main/java/pro/npofsi/rmpescript/RMPEScript.java b/src/main/java/pro/npofsi/rmpescript/RMPEScript.java
index 4676c35..f9992d1 100644
--- a/src/main/java/pro/npofsi/rmpescript/RMPEScript.java
+++ b/src/main/java/pro/npofsi/rmpescript/RMPEScript.java
@@ -62,7 +62,7 @@ public void init(FMLInitializationEvent event)
         Log.i("RMPEScript starting...");
         ScriptFileManager.getInstance().refresh();
         ScriptManager.getInstance().runAllScripts(null);
-        FMLEventHandler.runCallBack("init",event);
+        FMLEventHandler.getInstance().runCallBack("init",event);
     }
 
     @EventHandler
@@ -75,7 +75,7 @@ public void serverStarting(FMLServerStartingEvent event) {
         CommandManager.getInstance().refresh((ServerCommandManager) Intent.getServer().getCommandManager());
         CommandManager.getInstance().register(new CommandRMPE());
         Level.setWorld(event.getServer().getEntityWorld());
-        FMLEventHandler.runCallBack("serverStarting",event);
+        FMLEventHandler.getInstance().runCallBack("serverStarting",event);
     }
 
 
diff --git a/src/main/java/pro/npofsi/rmpescript/beta/CommandBoom.java b/src/main/java/pro/npofsi/rmpescript/beta/CommandBoom.java
index 94b034a..9a78829 100644
--- a/src/main/java/pro/npofsi/rmpescript/beta/CommandBoom.java
+++ b/src/main/java/pro/npofsi/rmpescript/beta/CommandBoom.java
@@ -31,6 +31,7 @@ public void execute(MinecraftServer server, ICommandSender sender, String[] args
             EntityPlayer player = (EntityPlayer) sender;
             // 接下来的代码我直接抄的Szszss的教程: http://www.hakugyokurou.net/wordpress/?p=225
             // 这串代码可以获取玩家周围一定范围的生物列表
+            
             List list = player.world.getEntitiesWithinAABB(EntityLiving.class, new AxisAlignedBB((double)player.posX - 30D, (double)player.posY - 20D, (double)player.posZ - 30D, (double)player.posX + 30D, (double)player.posY + 20D, (double)player.posZ + 30D));
             // 使用Iterator遍历list
             for (Iterator iterator = list.iterator(); iterator.hasNext();) {
diff --git a/src/main/java/pro/npofsi/rmpescript/broadcast/FMLEventHandler.java b/src/main/java/pro/npofsi/rmpescript/broadcast/FMLEventHandler.java
index 6fb008f..609abff 100644
--- a/src/main/java/pro/npofsi/rmpescript/broadcast/FMLEventHandler.java
+++ b/src/main/java/pro/npofsi/rmpescript/broadcast/FMLEventHandler.java
@@ -9,25 +9,25 @@
 public class FMLEventHandler {
 
 
-//    public FMLEventHandler(){}
-//    public static FMLEventHandler getInstance(){
-//        return ClassHolder.sInstance;
-//    }
-//    private static class ClassHolder{
-//        private static final FMLEventHandler sInstance = new FMLEventHandler();
-//    }
+    public FMLEventHandler(){}
+    public static FMLEventHandler getInstance(){
+        return ClassHolder.sInstance;
+    }
+    private static class ClassHolder{
+        private static final FMLEventHandler sInstance = new FMLEventHandler();
+    }
     //这个统一形式定义的接口导致不能使用rhino所提供的interface的简写形式，会导致rhino找不到相应的类型
     public interface FMLEventCallback{
         public void call(FMLEvent event);
     }
-    private static Map<String,Stack<FMLEventCallback>> eventStore=new TreeMap<String,Stack<FMLEventCallback>>();
-    public static void registerCallback(String name,FMLEventCallback callback){
+    private Map<String,Stack<FMLEventCallback>> eventStore=new TreeMap<String,Stack<FMLEventCallback>>();
+    public void registerCallback(String name,FMLEventCallback callback){
         if(eventStore.get(name)==null) { eventStore.put(name,new Stack<FMLEventCallback>());eventStore.get(name).push(callback); }else{ eventStore.get(name).push(callback); }
     }
-    public static boolean unregisterCallback(String name,FMLEventCallback callback){
+    public boolean unregisterCallback(String name,FMLEventCallback callback){
         if(eventStore.get(name)!=null) { return eventStore.get(name).remove(callback); }return false;
     }
-    public static void runCallBack(String eventName,FMLEvent event){
+    public void runCallBack(String eventName,FMLEvent event){
         Stack<FMLEventCallback> stk=eventStore.get(eventName);
         if(stk != null) for (int i = 0; i < stk.size();i++) stk.elementAt(i).call(event);
     }
diff --git a/src/main/java/pro/npofsi/rmpescript/data/DataStore.java b/src/main/java/pro/npofsi/rmpescript/data/DataStore.java
index 1eaca87..a3cdf61 100644
--- a/src/main/java/pro/npofsi/rmpescript/data/DataStore.java
+++ b/src/main/java/pro/npofsi/rmpescript/data/DataStore.java
@@ -63,5 +63,12 @@ public boolean accept(File f){
             return f.isFile();
         }
     }
+    public static class fileTypeFilter implements FileFilter {
+        String type;
+        public fileTypeFilter(String type){this.type=type;}
+        public boolean accept(File f){
+            return f.isFile()&&f.getName().endsWith("."+type);
+        }
+    }
 }
 
diff --git a/src/main/java/pro/npofsi/rmpescript/runtime/JSLoader.java b/src/main/java/pro/npofsi/rmpescript/runtime/JSLoader.java
index be3d241..a516018 100644
--- a/src/main/java/pro/npofsi/rmpescript/runtime/JSLoader.java
+++ b/src/main/java/pro/npofsi/rmpescript/runtime/JSLoader.java
@@ -10,6 +10,7 @@
 public class JSLoader extends Loader{
 
     private String script,srcName;
+    private Context cx=null;
 //    private Object ScriptManager= pro.npofsi.rmpescript.runtime.ScriptManager.getInstance();
 
     public JSLoader(String srcName,String script){
@@ -17,10 +18,11 @@ public JSLoader(String srcName,String script){
         this.script=script;
         this.setName(srcName);
     }
-    private Context cx = Context.enter();
+
     @Override
     public void run(){
         synchronized(ScriptManager.getInstance()){
+            cx = Context.enter();
             try {
                 Scriptable scope = cx.initStandardObjects();
                 Object result = cx.evaluateString(scope, script, srcName+RMPEScript.randomTag(), 1, null);
@@ -34,7 +36,7 @@ public void run(){
     }
     public void eval(String code){
         synchronized(ScriptManager.getInstance()){
-            try {
+            if(cx != null)try {
                 Scriptable scope = cx.initStandardObjects();
                 Object result = cx.evaluateString(scope, code, srcName+RMPEScript.randomTag(), 1, null);
                 RMPEScript.Log.i("Script eval end: "+cx.toString(result));
@@ -48,7 +50,7 @@ public void eval(String code){
     public void remove(){
         synchronized(ScriptManager.getInstance()){
             try {
-                cx.exit();
+                if(cx!= null)cx.exit();
                 this.join();
             } catch (InterruptedException e) {
                 e.printStackTrace();
diff --git a/src/main/java/pro/npofsi/rmpescript/runtime/ScriptFileManager.java b/src/main/java/pro/npofsi/rmpescript/runtime/ScriptFileManager.java
index 49780ad..84cbc2a 100644
--- a/src/main/java/pro/npofsi/rmpescript/runtime/ScriptFileManager.java
+++ b/src/main/java/pro/npofsi/rmpescript/runtime/ScriptFileManager.java
@@ -22,7 +22,7 @@ public void refresh(){
         ScriptManager.getInstance().refresh(refreshFromFiles());
     }
     public Map<String,String> refreshFromFiles(){
-        File[] fs=DataStore.getInstance().getScriptDir().listFiles(new DataStore.isFileFilter());
+        File[] fs=DataStore.getInstance().getScriptDir().listFiles(new DataStore.fileTypeFilter("js"));
         Map<String,String> scripts=new TreeMap<String, String>();
         for (File f : fs){
             try {