diff --git a/sharding-jdbc-orchestration/src/main/java/io/shardingjdbc/orchestration/internal/json/DataSourceGsonTypeConstants.java b/sharding-jdbc-orchestration/src/main/java/io/shardingjdbc/orchestration/internal/json/DataSourceGsonTypeConstants.java
index 923c0aab818cfa1cc2ae377f624752347af0e7b9..ac78df9759f0514a2130024b2687d23a4ac29849 100644
--- a/sharding-jdbc-orchestration/src/main/java/io/shardingjdbc/orchestration/internal/json/DataSourceGsonTypeConstants.java
+++ b/sharding-jdbc-orchestration/src/main/java/io/shardingjdbc/orchestration/internal/json/DataSourceGsonTypeConstants.java
@@ -1,6 +1,33 @@
+/*
+ * Copyright 1999-2015 dangdang.com.
+ * <p>
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * </p>
+ */
+
+
 package io.shardingjdbc.orchestration.internal.json;
 
-public class DataSourceGsonTypeConstants {
+import lombok.AccessLevel;
+import lombok.NoArgsConstructor;
+
+/**
+ * Data source constants for json.
+ * 
+ * @author zhangliang 
+ */
+@NoArgsConstructor(access = AccessLevel.PRIVATE)
+public final class DataSourceGsonTypeConstants {
     
     public static final String DATASOURCE_NAME = "shardingJdbcDataSourceName";