diff --git a/pom.xml b/pom.xml
index e9cff5d..d54d008 100644
--- a/pom.xml
+++ b/pom.xml
@@ -16,6 +16,7 @@
 
 	<properties>
 		<java.version>1.8</java.version>
+		<gson.version>2.8.5</gson.version>
 	</properties>
 
 	<dependencies>
@@ -30,6 +31,13 @@
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-web</artifactId>
+			<!-- Exclude the default Jackson dependency -->
+			<exclusions>
+				<exclusion>
+					<groupId>org.springframework.boot</groupId>
+					<artifactId>spring-boot-starter-json</artifactId>
+				</exclusion>
+			</exclusions>
 		</dependency>
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
@@ -39,6 +47,11 @@
 			<groupId>org.springframework.kafka</groupId>
 			<artifactId>spring-kafka</artifactId>
 		</dependency>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+			<version>${gson.version}</version>
+		</dependency>
 
 		<dependency>
 			<groupId>org.springframework.boot</groupId>
@@ -46,11 +59,6 @@
 			<scope>runtime</scope>
 			<optional>true</optional>
 		</dependency>
-		<dependency>
-			<groupId>com.h2database</groupId>
-			<artifactId>h2</artifactId>
-			<scope>runtime</scope>
-		</dependency>
 		<dependency>
 			<groupId>org.postgresql</groupId>
 			<artifactId>postgresql</artifactId>
diff --git a/src/main/java/com/totopia/server/Application.java b/src/main/java/com/totopia/server/Application.java
new file mode 100644
index 0000000..4c6dde2
--- /dev/null
+++ b/src/main/java/com/totopia/server/Application.java
@@ -0,0 +1,15 @@
+package com.totopia.server;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.jackson.JacksonAutoConfiguration;
+
+@SpringBootApplication
+@EnableAutoConfiguration(exclude = { JacksonAutoConfiguration.class })
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+}
diff --git a/src/main/java/com/totopia/server/ApplicationGsonExclusionStrategy.java b/src/main/java/com/totopia/server/ApplicationGsonExclusionStrategy.java
new file mode 100644
index 0000000..3e16a42
--- /dev/null
+++ b/src/main/java/com/totopia/server/ApplicationGsonExclusionStrategy.java
@@ -0,0 +1,30 @@
+package com.totopia.server;
+
+import com.google.gson.ExclusionStrategy;
+import com.google.gson.FieldAttributes;
+import com.totopia.server.commons.base.gson.annotation.Exclude;
+
+import org.springframework.boot.autoconfigure.gson.GsonBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class ApplicationGsonExclusionStrategy {
+
+  @Bean
+  GsonBuilderCustomizer gsonBuilderCustomizer() {
+    return (gsonBuilder) -> gsonBuilder.addSerializationExclusionStrategy(new ExclusionStrategy() {
+
+      @Override
+      public boolean shouldSkipField(FieldAttributes f) {
+        return f.getAnnotation(Exclude.class) != null;
+      }
+
+      @Override
+      public boolean shouldSkipClass(Class<?> clazz) {
+        return false;
+      }
+
+    });
+  }
+}
diff --git a/src/main/java/com/totopia/server/ServerApplication.java b/src/main/java/com/totopia/server/ServerApplication.java
deleted file mode 100644
index a86cfa1..0000000
--- a/src/main/java/com/totopia/server/ServerApplication.java
+++ /dev/null
@@ -1,12 +0,0 @@
-package com.totopia.server;
-
-import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.SpringBootApplication;
-
-@SpringBootApplication
-public class ServerApplication {
-
-	public static void main(String[] args) {
-		SpringApplication.run(ServerApplication.class, args);
-	}
-}
diff --git a/src/main/java/com/totopia/server/commons/base/gson/annotation/Exclude.java b/src/main/java/com/totopia/server/commons/base/gson/annotation/Exclude.java
new file mode 100644
index 0000000..daf6dad
--- /dev/null
+++ b/src/main/java/com/totopia/server/commons/base/gson/annotation/Exclude.java
@@ -0,0 +1,11 @@
+package com.totopia.server.commons.base.gson.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface Exclude {
+}
diff --git a/src/main/java/com/totopia/server/user/model/User.java b/src/main/java/com/totopia/server/user/model/User.java
index eccece4..cd806cd 100644
--- a/src/main/java/com/totopia/server/user/model/User.java
+++ b/src/main/java/com/totopia/server/user/model/User.java
@@ -5,7 +5,7 @@ import java.util.Date;
 
 import javax.persistence.*;
 
-import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.totopia.server.commons.base.gson.annotation.Exclude;
 
 import lombok.AllArgsConstructor;
 import lombok.Builder;
@@ -34,7 +34,7 @@ public class User implements Serializable {
 
   @Basic
   @Column(name = "password", nullable = false, length = 100)
-  @JsonIgnore
+  @Exclude
   private String password;
 
   @Basic
diff --git a/src/main/java/com/totopia/server/user/model/UserGroup.java b/src/main/java/com/totopia/server/user/model/UserGroup.java
index 6af4b95..fee6a3c 100644
--- a/src/main/java/com/totopia/server/user/model/UserGroup.java
+++ b/src/main/java/com/totopia/server/user/model/UserGroup.java
@@ -1,6 +1,5 @@
 package com.totopia.server.user.model;
 
-import com.fasterxml.jackson.annotation.JsonIgnore;
 import lombok.AllArgsConstructor;
 import lombok.Builder;
 import lombok.Data;
@@ -18,6 +17,8 @@ import java.util.Date;
 @NoArgsConstructor
 @AllArgsConstructor
 public class UserGroup implements Serializable {
+    private static final long serialVersionUID = 4801565634000630034L;
+
     @Id
     @GeneratedValue(generator = "user_group_generator")
     @SequenceGenerator(name = "user_group_generator", sequenceName = "user_group_sequence", initialValue = 1, allocationSize = 1)
@@ -25,7 +26,6 @@ public class UserGroup implements Serializable {
 
     @Basic
     @Column(name = "title", nullable = false, length = 100)
-    @JsonIgnore
     private String title;
 
     @Basic
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 0e68dda..2d2fa8a 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -1,42 +1,45 @@
 # Spring Boot configuration
 spring:
- application:
-  name: totopia-server
- h2:
-  console:
-   enabled: true
-   path: /h2-console
- datasource:
-   driver-class-name: org.postgresql.Driver
-   url: jdbc:postgresql://localhost:15432/postgres
-   data-username: postgres
-   password: qwer5795
-   username: postgres
-  # JPA properties
-   initialization-mode: never
- jpa:
-  hibernate:
-   ddl-auto: update
-  database: postgresql
-  show-sql: true
-  database-platform: org.hibernate.dialect.PostgreSQLDialect
-  properties:
+  application:
+    name: totopia-server
+  http:
+    converters:
+      preferred-json-mapper: gson
+  h2:
+    console:
+      enabled: true
+      path: /h2-console
+  datasource:
+    driver-class-name: org.postgresql.Driver
+    url: jdbc:postgresql://localhost:15432/postgres
+    data-username: postgres
+    username: postgres
+    password: qwer5795
+    # JPA properties
+    initialization-mode: never
+  jpa:
     hibernate:
+      ddl-auto: update
+    database: postgresql
+    show-sql: true
+    database-platform: org.hibernate.dialect.PostgreSQLDialect
+    properties:
+      hibernate:
       temp:
         use_jdbc_metadata_defaults: false
 
 
 # Logger configuration
 logging:
- pattern:
-  console: "%d %-5level %logger : %msg%n"
- level:
-  org.springframework: INFO
-  org.hibernate: DEBUG
+  pattern:
+    console: "%d %-5level %logger : %msg%n"
+  level:
+    root: ERROR
+    org.springframework: INFO
+    org.hibernate: DEBUG
 
 # Server configuration
 server:
- port: 8088
- servlet:
-  context-path: /api
-
+  port: 8088
+  servlet:
+    context-path: /api