diff --git a/src/main/java/cc/wdcy/domain/shared/security/WdcyUserDetails.java b/src/main/java/cc/wdcy/domain/shared/security/WdcyUserDetails.java
index d491dfe..f143a4e 100644
--- a/src/main/java/cc/wdcy/domain/shared/security/WdcyUserDetails.java
+++ b/src/main/java/cc/wdcy/domain/shared/security/WdcyUserDetails.java
@@ -26,6 +26,12 @@ public class WdcyUserDetails implements UserDetails {
         this.user = user;
     }
 
+    /**
+     * Note:  please change the codes in this method ,  make it is much more available .
+     * Just for test of current implements.
+     *
+     * @return Collection of GrantedAuthority
+     */
     @Override
     public Collection<? extends GrantedAuthority> getAuthorities() {
         return Arrays.asList(DEFAULT_USER_ROLE, new SimpleGrantedAuthority(ROLE_PREFIX + "UNITY"), new SimpleGrantedAuthority(ROLE_PREFIX + "MOBILE"));
diff --git a/src/main/java/cc/wdcy/infrastructure/DateUtils.java b/src/main/java/cc/wdcy/infrastructure/DateUtils.java
index d92355c..15c0cb7 100644
--- a/src/main/java/cc/wdcy/infrastructure/DateUtils.java
+++ b/src/main/java/cc/wdcy/infrastructure/DateUtils.java
@@ -8,6 +8,12 @@ import java.util.Date;
 public abstract class DateUtils {
 
 
+    /**
+     * Private constructor
+     */
+    private DateUtils() {
+    }
+
     public static Date now() {
         return new Date();
     }
diff --git a/src/main/java/cc/wdcy/infrastructure/PasswordHandler.java b/src/main/java/cc/wdcy/infrastructure/PasswordHandler.java
index 14ae796..b679e01 100644
--- a/src/main/java/cc/wdcy/infrastructure/PasswordHandler.java
+++ b/src/main/java/cc/wdcy/infrastructure/PasswordHandler.java
@@ -8,6 +8,12 @@ import org.springframework.security.authentication.encoding.Md5PasswordEncoder;
 public abstract class PasswordHandler {
 
 
+    /**
+     * Private constructor
+     */
+    private PasswordHandler() {
+    }
+
     /**
      * Encrypt  password ,if original password is empty,
      *
diff --git a/src/main/resources/cc/wdcy/infrastructure/mybatis/UserMapper.xml b/src/main/resources/cc/wdcy/infrastructure/mybatis/UserMapper.xml
index 6b9c480..cd3b47a 100644
--- a/src/main/resources/cc/wdcy/infrastructure/mybatis/UserMapper.xml
+++ b/src/main/resources/cc/wdcy/infrastructure/mybatis/UserMapper.xml
@@ -17,10 +17,6 @@
         <result property="username" column="username"/>
         <result property="lastLoginTime" column="last_login_time"/>
 
-        <!--<discriminator column="type_" javaType="String">-->
-        <!--<case value="Developer"-->
-        <!--resultMap="com.andaily.infrastructure.mybatis.user.DeveloperRepositoryMyBatis.developerMap"/>-->
-        <!--</discriminator>-->
     </resultMap>