diff --git a/src/main/debugger/org/bdware/sc/debugger/DebugMain.java b/src/main/debugger/org/bdware/sc/debugger/DebugMain.java
index bc0e999..563381e 100644
--- a/src/main/debugger/org/bdware/sc/debugger/DebugMain.java
+++ b/src/main/debugger/org/bdware/sc/debugger/DebugMain.java
@@ -4,7 +4,6 @@ import com.google.gson.JsonObject;
 import org.apache.log4j.LogManager;
 import org.apache.log4j.Logger;
 import org.bdware.sc.ContractProcess;
-import org.bdware.sc.YJSPacker;
 import org.bdware.sc.bean.Contract;
 import org.bdware.sc.bean.ContractExecType;
 import org.bdware.sc.conn.ResultCallback;
@@ -13,24 +12,9 @@ import org.bdware.sc.http.HttpUtil;
 import org.bdware.sc.util.FileUtil;
 import org.bdware.sc.util.JsonUtil;
 
-import java.io.File;
 import java.util.Map;
 
 public class DebugMain {
-    static class DebugConfig {
-        String script;
-        String agentHttpAddr;
-        String pubKey;
-        String privKey;
-        //AutoAppend
-
-        int port;
-        String cmi;
-        String dbPath;
-        int cPort;
-        Contract contract;
-    }
-
     static Logger LOGGER = LogManager.getLogger(DebugMain.class);
 
     public static void main(String[] args) {
@@ -52,8 +36,8 @@ public class DebugMain {
 
         String url = String.format(urlFormat, config.agentHttpAddr, config.pubKey);
         Map<String, Object> resp = HttpUtil.httpGet(url);
-        String data = (String)resp.get("response");
-        LOGGER.info(JsonUtil.toPrettyJson(JsonUtil.parseString(data)));
+        String data = (String) resp.get("response");
+        LOGGER.info(JsonUtil.toPrettyJson(JsonUtil.parseStringAsJsonObject(data)));
         LOGGER.info("start done!");
     }
 
@@ -63,7 +47,7 @@ public class DebugMain {
         Map<String, Object> resp = HttpUtil.httpGet(url);
         String data = (String
                 ) resp.get("response");
-        JsonObject jsonObject = JsonUtil.parseString(data);
+        JsonObject jsonObject = JsonUtil.parseStringAsJsonObject(data);
         config.cmi = jsonObject.get("cmi").getAsString();
         config.dbPath = jsonObject.get("dbPath").getAsString();
         config.cPort = jsonObject.get("cPort").getAsInt();
@@ -90,4 +74,18 @@ public class DebugMain {
         msg.arg = arg;
         return msg;
     }
+
+    static class DebugConfig {
+        String script;
+        String agentHttpAddr;
+        String pubKey;
+        String privKey;
+        //AutoAppend
+
+        int port;
+        String cmi;
+        String dbPath;
+        int cPort;
+        Contract contract;
+    }
 }
diff --git a/src/main/java/org/bdware/sc/engine/hook/HomomorphicDecryptHandler.java b/src/main/java/org/bdware/sc/engine/hook/HomomorphicDecryptHandler.java
index a83ee99..ddb99a0 100644
--- a/src/main/java/org/bdware/sc/engine/hook/HomomorphicDecryptHandler.java
+++ b/src/main/java/org/bdware/sc/engine/hook/HomomorphicDecryptHandler.java
@@ -46,7 +46,7 @@ public class HomomorphicDecryptHandler implements AnnotationHook {
                 LOGGER.info("HomomorphicEncryptHandler--------------------------------3: " + privkey);
                 HomoVisitor.privateKey = privkey;
                 ret = getDecryptResult(homoDecryptConf, JsonUtil.parseObject(ret));
-                if (ret != null) {
+                if (null != ret) {
                     return ret;
                 }
                 ret = new JsonObject();
diff --git a/src/main/java/org/bdware/sc/memory/MemoryDump.java b/src/main/java/org/bdware/sc/memory/MemoryDump.java
index b6de25e..a9feed5 100644
--- a/src/main/java/org/bdware/sc/memory/MemoryDump.java
+++ b/src/main/java/org/bdware/sc/memory/MemoryDump.java
@@ -34,7 +34,7 @@ public class MemoryDump implements Serializable {
     }
 
     public static MemoryDump loadFromStr(String memDump) {
-        JsonObject map = JsonUtil.parseString(memDump);
+        JsonObject map = JsonUtil.parseStringAsJsonObject(memDump);
         MemoryDump ret = new MemoryDump();
         for (Entry<String, JsonElement> entry : map.entrySet()) {
             long id = Long.parseLong(entry.getKey());