diff --git a/pom.xml b/pom.xml
index 375ba028d..795d0001a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,7 +6,7 @@
 
     <groupId>com.baidu.hugegraph</groupId>
     <artifactId>hugegraph-common</artifactId>
-    <version>1.3.0-SNAPSHOT</version>
+    <version>1.3.1-SNAPSHOT</version>
 
     <distributionManagement>
         <snapshotRepository>
@@ -154,7 +154,7 @@
                         </manifest>
                         <manifestEntries>
                             <Implementation-Version>
-                                1.3.0.0
+                                1.3.1.0
                             </Implementation-Version>
                         </manifestEntries>
                     </archive>
diff --git a/src/main/java/com/baidu/hugegraph/util/CheckSocket.java b/src/main/java/com/baidu/hugegraph/util/CheckSocket.java
index 17aded4ae..961c42a8a 100644
--- a/src/main/java/com/baidu/hugegraph/util/CheckSocket.java
+++ b/src/main/java/com/baidu/hugegraph/util/CheckSocket.java
@@ -34,7 +34,7 @@ public final class CheckSocket {
     private static final int E_USAGE = 1;
     private static final int E_FAILED = 2;
     private static final String MSG_USAGE =
-        "Usage: " + CheckSocket.class.getSimpleName() + " hostname port";
+            "Usage: " + CheckSocket.class.getSimpleName() + " hostname port";
 
     public static void main(String args[]) {
         if (args.length != 2) {
diff --git a/src/main/java/com/baidu/hugegraph/util/CollectionUtil.java b/src/main/java/com/baidu/hugegraph/util/CollectionUtil.java
index 9e983d149..331d29cda 100644
--- a/src/main/java/com/baidu/hugegraph/util/CollectionUtil.java
+++ b/src/main/java/com/baidu/hugegraph/util/CollectionUtil.java
@@ -19,15 +19,30 @@
 
 package com.baidu.hugegraph.util;
 
+import java.lang.reflect.Array;
+import java.util.ArrayList;
 import java.util.Collection;
+import java.util.List;
 
-/**
- * Created by liningrui on 2017/3/30.
- */
 public final class CollectionUtil {
 
     @SuppressWarnings({ "unchecked", "rawtypes" })
     public static boolean containsAll(Collection a, Collection b) {
         return a.containsAll(b);
     }
+
+    @SuppressWarnings("unchecked")
+    public static <T> List<T> toList(Object array) {
+        E.checkNotNull(array, "array");
+        E.checkArgument(array.getClass().isArray(),
+                        "The parameter of toList() must be an array: '%s'",
+                        array.getClass().getSimpleName());
+
+        int length = Array.getLength(array);
+        List<T> list = new ArrayList<>(length);
+        for (int i = 0; i < length; i++) {
+            list.add((T) Array.get(array, i));
+        }
+        return list;
+    }
 }
diff --git a/src/main/java/com/baidu/hugegraph/util/E.java b/src/main/java/com/baidu/hugegraph/util/E.java
index 727b7fd49..340b7bc7a 100644
--- a/src/main/java/com/baidu/hugegraph/util/E.java
+++ b/src/main/java/com/baidu/hugegraph/util/E.java
@@ -25,9 +25,6 @@ import javax.annotation.Nullable;
 
 import com.google.common.base.Preconditions;
 
-/**
- * Created by liningrui on 2017/5/26.
- */
 public final class E {
 
     public static void checkNotNull(Object object, String elem) {
diff --git a/src/main/java/com/baidu/hugegraph/util/HashUtil.java b/src/main/java/com/baidu/hugegraph/util/HashUtil.java
index bdb29f552..3a39eb3d4 100644
--- a/src/main/java/com/baidu/hugegraph/util/HashUtil.java
+++ b/src/main/java/com/baidu/hugegraph/util/HashUtil.java
@@ -23,9 +23,6 @@ import java.nio.charset.Charset;
 
 import com.google.common.hash.Hashing;
 
-/**
- * Created by jishilei on 2017/3/26.
- */
 public final class HashUtil {
 
     public static byte[] hash(byte[] bytes) {