diff --git a/src/main/java/org/bdware/sc/SM2Helper.java b/src/main/java/org/bdware/sc/SM2Helper.java
new file mode 100644
index 0000000..10cdfb5
--- /dev/null
+++ b/src/main/java/org/bdware/sc/SM2Helper.java
@@ -0,0 +1,46 @@
+package org.bdware.sc;
+
+import org.bdware.sc.util.FileUtil;
+import org.zz.gmhelper.SM2KeyPair;
+import org.zz.gmhelper.SM2Util;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.nio.charset.StandardCharsets;
+import java.security.SecureRandom;
+
+public class SM2Helper {
+    public static void main(String[] args) {
+
+        SM2KeyPair pair = SM2Util.generateSM2KeyPair(new SecureRandom());
+        try {
+            if (args.length > 0 && args[0].equals("generateKeyToFile")) {
+                backupFile(new File("./manager.keypair"));
+                backupFile(new File("./manager.key"));
+                System.out.println("Generate file: manger.key, manager.keypair");
+                FileOutputStream fout = new FileOutputStream("./manager.keypair");
+                fout.write(pair.toJson().getBytes(StandardCharsets.UTF_8));
+                fout.close();
+                fout = new FileOutputStream("./manager.key");
+                fout.write(pair.getPublicKeyStr().getBytes(StandardCharsets.UTF_8));
+                fout.close();
+            } else
+                System.out.println(pair.toJson());
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static void backupFile(File file) {
+        if (!file.exists()) return;
+        File backup = null;
+        for (int i = 0; i <= 100; i++) {
+            if (i == 100) throw new IllegalArgumentException("failed to backup:" + file.getAbsolutePath());
+            backup = new File(file.getParent(), file.getName() + "." + i);
+            if (!backup.exists())
+                break;
+        }
+        FileUtil.copyFile(file, backup);
+        System.out.println("Backup: " + file.getAbsolutePath() + " --> " + backup.getAbsolutePath());
+    }
+}
diff --git a/src/main/java/org/bdware/sc/boundry/JavaScriptEntry.java b/src/main/java/org/bdware/sc/boundry/JavaScriptEntry.java
index efdbddc..77ef3d0 100644
--- a/src/main/java/org/bdware/sc/boundry/JavaScriptEntry.java
+++ b/src/main/java/org/bdware/sc/boundry/JavaScriptEntry.java
@@ -18,6 +18,7 @@ import org.bdware.sc.util.HashUtil;
 import org.bdware.sc.util.JsonUtil;
 import org.zz.gmhelper.SM2KeyPair;
 import wrp.jdk.nashorn.api.scripting.NashornScriptEngine;
+import wrp.jdk.nashorn.api.scripting.ScriptObjectMirror;
 import wrp.jdk.nashorn.internal.objects.Global;
 import wrp.jdk.nashorn.internal.runtime.PropertyMap;
 import wrp.jdk.nashorn.internal.runtime.ScriptFunction;
diff --git a/src/main/java/org/bdware/sc/boundry/utils/RocksDBUtil.java b/src/main/java/org/bdware/sc/boundry/utils/RocksDBUtil.java
index f9c0739..c0ae2be 100644
--- a/src/main/java/org/bdware/sc/boundry/utils/RocksDBUtil.java
+++ b/src/main/java/org/bdware/sc/boundry/utils/RocksDBUtil.java
@@ -75,7 +75,6 @@ public class RocksDBUtil {
         try {
             return new String(rocksDB.get(key.getBytes()));
         } catch (Exception e) {
-            e.printStackTrace();
         }
         return null;
     }
diff --git a/src/main/java/org/bdware/sc/engine/JSONTool.java b/src/main/java/org/bdware/sc/engine/JSONTool.java
index 4e16a9a..9c65aff 100644
--- a/src/main/java/org/bdware/sc/engine/JSONTool.java
+++ b/src/main/java/org/bdware/sc/engine/JSONTool.java
@@ -2,6 +2,7 @@ package org.bdware.sc.engine;
 
 import com.google.gson.*;
 import wrp.jdk.nashorn.api.scripting.ScriptObjectMirror;
+import wrp.jdk.nashorn.internal.objects.NativeArray;
 import wrp.jdk.nashorn.internal.runtime.PropertyMap;
 import wrp.jdk.nashorn.internal.scripts.JO;
 
@@ -31,12 +32,11 @@ public class JSONTool {
             }
             return jo;
         } else if (jsonElement.isJsonArray()) {
-            JO jo = new JO(PropertyMap.newMap());
-            jo.setIsArray();
+            NativeArray narray = new NativeArray();
             JsonArray jsonArray = jsonElement.getAsJsonArray();
             for (int i = 0; i < jsonArray.size(); i++)
-                jo.put(i, convertJsonElementToMirror(jsonArray.get(i)), false);
-            return jo;
+                NativeArray.push(narray, convertJsonElementToMirror(jsonArray.get(i)));
+            return narray;
         }
         return null;
     }