diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..8af972c
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,3 @@
+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d70d5a9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,43 @@
+*#
+*.iml
+*.ipr
+*.iws
+*.jar
+*.sw?
+*~
+.#*
+.*.md.html
+.DS_Store
+.attach_pid*
+.classpath
+.factorypath
+.gradle
+.metadata
+.project
+.recommenders
+.settings
+.springBeans
+.vscode
+/code
+MANIFEST.MF
+_site/
+activemq-data
+bin
+build
+!/**/src/**/bin
+!/**/src/**/build
+build.log
+dependency-reduced-pom.xml
+dump.rdb
+interpolated*.xml
+lib/
+manifest.yml
+out
+overridedb.*
+target
+.flattened-pom.xml
+secrets.yml
+.gradletasknamecache
+.sts4-cache
+
+.idea
\ No newline at end of file
diff --git a/HELP.md b/HELP.md
new file mode 100644
index 0000000..015785b
--- /dev/null
+++ b/HELP.md
@@ -0,0 +1,27 @@
+# Read Me First
+The following was discovered as part of building this project:
+
+* The original package name 'com.ceos21.spring-boot' is invalid and this project uses 'com.ceos21.spring_boot' instead.
+
+# Getting Started
+
+### Reference Documentation
+For further reference, please consider the following sections:
+
+* [Official Gradle documentation](https://docs.gradle.org)
+* [Spring Boot Gradle Plugin Reference Guide](https://docs.spring.io/spring-boot/3.4.3/gradle-plugin)
+* [Create an OCI image](https://docs.spring.io/spring-boot/3.4.3/gradle-plugin/packaging-oci-image.html)
+* [Spring Web](https://docs.spring.io/spring-boot/3.4.3/reference/web/servlet.html)
+
+### Guides
+The following guides illustrate how to use some features concretely:
+
+* [Building a RESTful Web Service](https://spring.io/guides/gs/rest-service/)
+* [Serving Web Content with Spring MVC](https://spring.io/guides/gs/serving-web-content/)
+* [Building REST services with Spring](https://spring.io/guides/tutorials/rest/)
+
+### Additional Links
+These additional references should also help you:
+
+* [Gradle Build Scans – insights for your project's build](https://scans.gradle.com#gradle)
+
diff --git a/README.md b/README.md
index ebeffaf..6ec0bd1 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,79 @@
-# spring-tutorial-21st
+# WIL 1
 CEOS back-end 21st spring tutorial project
+
+## Spring Framework
+시작하기 전 알면 좋을 개념
+- **프레임워크 vs 라이브러리**
+  - 공통점: 이미 만들어진 것을 개발자가 사용한다
+  - 차이점: 프로그램의 제어권 여부(프레임워크 -> 코드 -> 라이브러리)
+- **컨테이너란?**
+  - 어떤 환경에서든 코드를 실행할 수 있도록, 코드 실행에 필요한 모든 요소를 담아둔 소프트웨어 패키지.
+  코드는 물론 언어, 라이브러리 같이 종속적인 모든 항목을 포함한다.
+
+### Spring 프레임워크란?
+기업에서 자바 어플리케이션을 만들기 위해 사용할 수 있을 정도의 기술을 포함하고 있는 프레임워크.
+- 자바 플랫폼
+- 경량(과도한 엔지니어링 없이 단순한 환경에서 사용 가능)
+
+#### Spring Boot vs Spring
+기존에는 다소 복잡했던 스프링 프레임워크의 의존성 설정이나 버전 관리, 빈 등록, 배포 등을 더 쉽게 할 수 있도록 도와주는 프레임워크가 Spring Boot 이다.
+
+### Spring이 지원하는 기술들
+- IoC/DI
+  - 제어의 역전: 스프링 컨테이너가 빈으로 등록된 객체의 생명 주기를 관리한다.
+  - 의존성 주입: 어떤 객체를 이용해야 할 때, 내부에서 선언, 생성하는 것이 아니라 스프링이 외부에서 주입해줌.
+- AOP
+  - 어떤 코드들이 사용하는 공통적인 로직이 있을 때 이 코드들을 모아서 필요한 곳에 공통으로 적용 가능
+- PSA
+  - 여러 서비스를 묶어서 하나로 추상화하는 것. 이 때문에 내부 전략이 바뀌더라도 이를 신경쓰지 않아도 된다.
+  - 예를 들어 `@Transactional` 어노테이션을 사용할 때 데이터베이스와 연결 시 JDBC, JPA 중 어느것을 사용하든 해당 어노테이션의 내부적 구현을 바꾸지 않고 사용 가능하다.
+  사용자의 선언에 따라 의존성을 주입받기 때문이다.
+- POJO
+  - Java 스펙에 기술되지 않은 다른 기술을 사용하지 않고 순수한 자바 코드만으로 작성한 오브젝트.
+  - 이를 위해 위의 IoC/Di, AOP 등의 기술을 지원한다.
+
+
+## Spring Bean
+앞서 일반적인 컨테이너에 대해 설명해두었는데, 스프링 컨테이너에 대해 더 자세히 알아보자.
+
+스프링 컨테이너란 `ApplicationContext`라는 인터페이스를 일컫는다. 즉, 자바 코드 내에서 객체로 선언하고 구현체를 생성할 수 있다.
+이 인터페이스의 구현체를 생성할때 빈들 간의 관계를 정의한 config 파일(xml 등)을 넘겨주는데, 이곳에 정의된 메타 정보(데이터의 스펙)를 읽으면서 '스프링 컨테이너'가 된다.
+
+context 객체는 xml 파일을 읽으면서, 파일 내 정의된 객체를 생성하고 관리하게 된다. `getBean` 메소드를 통해 객체를 전달할 수 있다.
+
+이 때 xml 파일에 정의되어 스프링 컨테이너가 관리하게 된 자바 객체를 **빈** 이라고 한다.
+
+### 스프링 빈의 생명 주기
+`스프링컨테이너 생성 -> 스프링 빈 생성 -> 의존관계 주입 -> 초기화 콜백 -> 사용 -> 소멸 전 콜백 -> 스프링 종료`
+이 때, 생성자로 의존성을 주입 받는다면 객체 생성과 동시 의존 관계가 주입된다.
+그렇지 않고 setter 등으로 의존 관계를 주입 받는다면 객체를 먼저 생성하고, 그 후에 의존성을 주입한다.
+- 초기화 콜백
+
+## Spring Annotation
+### 어노테이션이란?
+코드 자체의 기능을 변경하는 것이 아니라, 해당 코드의 메타 정보에 추가적인 정보를 제공하면서
+런타임에 특정 기능을 실행하도록 알려주는 일종의 메타 데이터이다.
+
+각 어노테이션은 또 다른 어노테이션을 포함하고 있을 수 있고, 어노테이션을 직접 만들 수도 있다.
+
+### 종류
+매우 많다. `@Controller`, `@Service`, `@Bean` 등의 어노테이션이 있다. 각 어노테이션들은 다른 어노테이션을 포함하고 있을 수도 있는데, `@Component` 어노테이션을 포함하고 있는 어노테이션들은 빈으로 등록될 수 있다.
+
+### Bean 등록 과정
+`@ComponentScan`어노테이션은 `@Component` 어노테이션이 포함되어있는 어노테이션을 자동으로 스캔하여 해당 객체를 빈으로 등록한다.
+
+이 전에는 xml 파일에 패키지 경로를 입력하여 정의했지만 어노테이션을 사용하면 자바 파일에서 스캔할 수 있다.
+
+
+
+## 단위 테스트와 통합 테스트
+### 단위 테스트
+격리된 환경에서 필요한 부분만 모의 객체를 모아서 빠르고 효율적으로 테스트를 진행한다.
+서비스, 레포지토리, 도메인, 또는 코드 별 테스트를 작성할 수 있다.
+
+실제 테스트하려는 클래스와 의존 관계에 있는 다른 객체들은 가짜 객체로 대체하여 진행한다.
+### 통합 테스트
+어플리케이션의 전체 컨텍스트를 가져와 실제 동작 환경과 유사한 환경에서 테스트를 진행한다.
+
+시스템 바깥의 다른 외부 시스템과의 연동 상태도 점검 가능하다.
+
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..ce0459b
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,38 @@
+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '3.4.3'
+	id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'com.ceos21'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(17)
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+
+	//jpa
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+
+	//lombok
+	compileOnly 'org.projectlombok:lombok'
+	annotationProcessor 'org.projectlombok:lombok'
+
+	//h2
+	runtimeOnly 'com.h2database:h2'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..e18bc25
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.12.1-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100644
index 0000000..f5feea6
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,252 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# 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
+#
+#      https://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.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s
+' "$PWD" ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..9d21a21
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,94 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+@rem SPDX-License-Identifier: Apache-2.0
+@rem
+
+@if "%DEBUG%"=="" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%"=="" set DIRNAME=.
+@rem This is normally unused
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if %ERRORLEVEL% equ 0 goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo. 1>&2
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2
+echo. 1>&2
+echo Please set the JAVA_HOME variable in your environment to match the 1>&2
+echo location of your Java installation. 1>&2
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if %ERRORLEVEL% equ 0 goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+set EXIT_CODE=%ERRORLEVEL%
+if %EXIT_CODE% equ 0 set EXIT_CODE=1
+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%
+exit /b %EXIT_CODE%
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 0000000..19b5204
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'spring-boot'
diff --git a/src/main/java/com/ceos21/spring_boot/Application.java b/src/main/java/com/ceos21/spring_boot/Application.java
new file mode 100644
index 0000000..deae1f6
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/Application.java
@@ -0,0 +1,34 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.Bean;
+
+import java.util.Arrays;
+
+@SpringBootApplication
+public class Application {
+
+	public static void main(String[] args) {
+		SpringApplication.run(Application.class, args);
+	}
+
+	@Bean
+	public CommandLineRunner commandLineRunner(ApplicationContext ctx) {
+		return args -> {
+
+			System.out.println("Let's inspect the beans provided by Spring Boot:");
+
+			// Spring Boot 에서 제공되는 Bean 확인
+			String[] beanNames = ctx.getBeanDefinitionNames();
+			Arrays.sort(beanNames);
+			for (String beanName : beanNames) {
+				System.out.println(beanName);
+			}
+
+		};
+	}
+
+}
\ No newline at end of file
diff --git a/src/main/java/com/ceos21/spring_boot/HelloController.java b/src/main/java/com/ceos21/spring_boot/HelloController.java
new file mode 100644
index 0000000..fbd862f
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/HelloController.java
@@ -0,0 +1,14 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+public class HelloController {
+
+    @GetMapping("/")
+    public String index() {
+        return "Greetings from Spring Boot!";
+    }
+
+}
diff --git a/src/main/java/com/ceos21/spring_boot/Test.java b/src/main/java/com/ceos21/spring_boot/Test.java
new file mode 100644
index 0000000..7020b84
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/Test.java
@@ -0,0 +1,14 @@
+package com.ceos21.spring_boot;
+
+import jakarta.persistence.Entity;
+import jakarta.persistence.Id;
+import lombok.Data;
+
+@Data
+@Entity
+public class Test {
+
+    @Id
+    private Long id;
+    private String name;
+}
\ No newline at end of file
diff --git a/src/main/java/com/ceos21/spring_boot/TestController.java b/src/main/java/com/ceos21/spring_boot/TestController.java
new file mode 100644
index 0000000..bdb833f
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/TestController.java
@@ -0,0 +1,21 @@
+package com.ceos21.spring_boot;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping(value = "/tests")
+public class TestController {
+
+    private final TestService testService;
+
+    @GetMapping
+    public List<Test> findAllTests() {
+        return testService.findAllTests();
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/ceos21/spring_boot/TestRepository.java b/src/main/java/com/ceos21/spring_boot/TestRepository.java
new file mode 100644
index 0000000..b90d2ed
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/TestRepository.java
@@ -0,0 +1,5 @@
+package com.ceos21.spring_boot;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface TestRepository extends JpaRepository<Test, Long> {}
\ No newline at end of file
diff --git a/src/main/java/com/ceos21/spring_boot/TestService.java b/src/main/java/com/ceos21/spring_boot/TestService.java
new file mode 100644
index 0000000..523f226
--- /dev/null
+++ b/src/main/java/com/ceos21/spring_boot/TestService.java
@@ -0,0 +1,20 @@
+package com.ceos21.spring_boot;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+
+@Service
+@RequiredArgsConstructor
+public class TestService {
+
+    private final TestRepository testRepository;
+
+    /* Read All*/
+    @Transactional(readOnly = true)
+    public List<Test> findAllTests() {
+        return testRepository.findAll();
+    }
+}
\ No newline at end of file
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
new file mode 100644
index 0000000..e02c51d
--- /dev/null
+++ b/src/main/resources/application.yml
@@ -0,0 +1,17 @@
+spring:
+  datasource:
+    url: jdbc:h2:tcp://localhost/~/ceos21
+    username: sa
+    password:
+    driver-class-name: org.h2.Driver
+
+  jpa:
+    hibernate:
+      ddl-auto: create
+    properties:
+      hibernate:
+        format_sql: true
+
+logging:
+  level:
+    org.hibernate.SQL: debug
\ No newline at end of file
diff --git a/src/test/java/com/ceos21/spring_boot/ApplicationTests.java b/src/test/java/com/ceos21/spring_boot/ApplicationTests.java
new file mode 100644
index 0000000..cfbe7af
--- /dev/null
+++ b/src/test/java/com/ceos21/spring_boot/ApplicationTests.java
@@ -0,0 +1,13 @@
+package com.ceos21.spring_boot;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class ApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}
diff --git a/src/test/java/com/ceos21/spring_boot/HelloControllerTest.java b/src/test/java/com/ceos21/spring_boot/HelloControllerTest.java
new file mode 100644
index 0000000..0411a97
--- /dev/null
+++ b/src/test/java/com/ceos21/spring_boot/HelloControllerTest.java
@@ -0,0 +1,31 @@
+package com.ceos21.spring_boot;
+
+import static org.hamcrest.Matchers.equalTo;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
+
+@SpringBootTest
+@AutoConfigureMockMvc
+public class HelloControllerTest {
+
+    @Autowired
+    private MockMvc mvc;
+
+    @DisplayName("DisplayName : 테스트 이름을 설정할 수 있습니다")
+    @Test
+    public void getHello() throws Exception {
+        mvc.perform(MockMvcRequestBuilders.get("/").accept(MediaType.APPLICATION_JSON))
+                .andExpect(status().isOk())
+                .andExpect(content().string(equalTo("Greetings from Spring Boot!")));
+    }
+}