feat: 수강신청 프로젝트 생성

.env

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+timezone=UTC

.gitattributes

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+/gradlew text eol=lf
+*.bat text eol=crlf
+*.jar binary

.gitignore

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+HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/

build.gradle

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+plugins {
+	id 'java'
+	id 'org.springframework.boot' version '4.1.1'
+	id 'io.spring.dependency-management' version '1.1.7'
+}
+
+group = 'com.study'
+version = '0.0.1-SNAPSHOT'
+
+java {
+	toolchain {
+		languageVersion = JavaLanguageVersion.of(21)
+	}
+}
+
+repositories {
+	mavenCentral()
+}
+
+dependencies {
+	//Web
+	implementation 'org.springframework.boot:spring-boot-starter-web'
+	//JPA
+	implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+	//PostgreSQL
+	runtimeOnly 'org.postgresql:postgresql'
+	//Lombok
+	compileOnly 'org.projectlombok:lombok'
+	annotationProcessor 'org.projectlombok:lombok'
+	//Swagger
+    implementation 'org.springdoc:springdoc-openapi-starter-webmvc-ui:2.8.9'
+	//Validation
+	implementation 'org.springframework.boot:spring-boot-starter-validation'
+	//Jackson
+	implementation 'com.fasterxml.jackson.datatype:jackson-datatype-jsr310'
+	//H2
+	runtimeOnly 'com.h2database:h2'
+	runtimeOnly 'org.springframework.boot:spring-boot-h2console'
+	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+	testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
+}
+
+tasks.named('test') {
+	useJUnitPlatform()
+}

gradle/wrapper/gradle-wrapper.properties

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+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.7.1-bin.zip
+networkTimeout=10000
+retries=0
+retryBackOffMs=500
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists

gradlew

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+#!/bin/sh
+
+#
+# Copyright © 2015 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
+#
+
+##############################################################################
+#
+#   gradlew 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 gradlew
+#
+#       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/3d91ce3b8caaf77ad09f381f43615b715b53f72c/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 "${APP_HOME:-./}" > /dev/null && printf '%s\n' "$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 "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$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 "$APP_HOME" )
+
+    JAVACMD=$( 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, 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=$APP_BASE_NAME" \
+        -jar "$APP_HOME/gradle/wrapper/gradle-wrapper.jar" \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$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 "$JAVACMD" "$@"

gradlew.bat

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+@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  gradlew startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables, and ensure extensions are enabled
+setlocal EnableExtensions
+
+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
+
+"%COMSPEC%" /c exit 1
+
+: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
+
+"%COMSPEC%" /c exit 1
+
+:execute
+@rem Setup the command line
+
+
+
+@rem Execute gradlew
+@rem endlocal doesn't take effect until after the line is parsed and variables are expanded
+@rem which allows us to clear the local environment before executing the java command
+endlocal & "%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -jar "%APP_HOME%\gradle\wrapper\gradle-wrapper.jar" %* & call :exitWithErrorLevel
+
+:exitWithErrorLevel
+@rem Use "%COMSPEC%" /c exit to allow operators to work properly in scripts
+"%COMSPEC%" /c exit %ERRORLEVEL%

settings.gradle

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+rootProject.name = 'course-registration'

src/main/java/com/study/course_registration/CourseRegistrationApplication.java

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+package com.study.course_registration;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class CourseRegistrationApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(CourseRegistrationApplication.class, args);
+	}
+
+}

src/main/java/com/study/course_registration/config/JpaConfig.java

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+package com.study.course_registration.config;
+
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
+
+@Configuration 
+@EnableJpaAuditing
+public class JpaConfig {
+    
+}

src/main/java/com/study/course_registration/controller/CourseRegistrationController.java

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+package com.study.course_registration.controller;
+
+import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.responses.ApiResponse;
+import io.swagger.v3.oas.annotations.responses.ApiResponses;
+
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.study.course_registration.service.CourseRegistrationService;
+
+import com.study.course_registration.dto.RequestDto;
+import com.study.course_registration.dto.ResponseDto;
+
+@RestController
+@RequestMapping ("/api/v1")
+public class CourseRegistrationController {
+
+    private final CourseRegistrationService courseRegistrationService;
+    
+    public CourseRegistrationController(CourseRegistrationService courseRegistrationService) {
+        this.courseRegistrationService = courseRegistrationService;
+    }
+
+    @PostMapping("/course-register")
+    @Operation(summary = "Register a course",
+            description = "Registers a new course with the provided details.")
+    @ApiResponses({
+        @ApiResponse (responseCode = "200", description = "Course registered successfully"),
+        @ApiResponse (responseCode = "400", description = "Invalid request data")
+    })
+    public ResponseDto registerCourse(@Validated RequestDto requestDto) {
+        return courseRegistrationService.registerCourse(requestDto);
+    }
+
+}

src/main/java/com/study/course_registration/dto/RequestDto.java

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+package com.study.course_registration.dto;
+
+public record RequestDto(
+    
+) {
+    
+}

src/main/java/com/study/course_registration/dto/ResponseDto.java

@@ -0,0 +1,7 @@
+package com.study.course_registration.dto;
+
+public record ResponseDto(
+    
+) {
+    
+}

src/main/java/com/study/course_registration/entity/BaseCreateEntity.java

@@ -0,0 +1,15 @@
+package com.study.course_registration.entity;
+
+import java.time.Instant;
+
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+
+import jakarta.persistence.*;
+
+@MappedSuperclass 
+@EntityListeners (AuditingEntityListener.class)
+public class BaseCreateEntity {
+    @CreatedDate 
+    private Instant createdAt;
+}

src/main/java/com/study/course_registration/entity/BaseDeleteEntity.java

@@ -0,0 +1,24 @@
+package com.study.course_registration.entity;
+
+import java.time.Instant;
+
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@MappedSuperclass
+@Getter 
+public class BaseDeleteEntity {
+    private Instant deletedAt;
+
+    public void delete() {
+        this.deletedAt = Instant.now();
+    }
+
+    public void restore() {
+        this.deletedAt = null;
+    }
+
+    public boolean isDeleted() {
+        return this.deletedAt != null;
+    }
+}

src/main/java/com/study/course_registration/entity/BaseEntity.java

@@ -0,0 +1,15 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.GeneratedValue;
+import jakarta.persistence.GenerationType;
+import jakarta.persistence.Id;
+import jakarta.persistence.MappedSuperclass;
+import lombok.Getter;
+
+@Getter
+@MappedSuperclass 
+public class BaseEntity {
+    @Id 
+    @GeneratedValue(strategy = GenerationType.UUID)
+    private String id;
+}

src/main/java/com/study/course_registration/entity/BaseTimeZoneEntity.java

@@ -0,0 +1,19 @@
+package com.study.course_registration.entity;
+
+import java.time.Instant;
+
+import org.springframework.data.annotation.CreatedDate;
+import org.springframework.data.annotation.LastModifiedDate;
+import org.springframework.data.jpa.domain.support.AuditingEntityListener;
+import jakarta.persistence.EntityListeners;
+import jakarta.persistence.MappedSuperclass;
+
+@MappedSuperclass 
+@EntityListeners (AuditingEntityListener.class)
+public class BaseTimeZoneEntity extends BaseEntity {
+    @CreatedDate 
+    private Instant createdAt;
+
+    @LastModifiedDate 
+    private Instant updatedAt;
+}

src/main/java/com/study/course_registration/entity/Lesson.java

@@ -0,0 +1,33 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+import java.time.Instant;
+
+@Entity 
+@NoArgsConstructor 
+@Getter 
+@Table(name = "lessons")
+public class Lesson extends BaseTimeZoneEntity {
+    private String name;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    private Subject subject;
+
+    @ManyToOne(fetch = FetchType.LAZY)
+    private Professor professor;
+
+    private Instant startTime;
+
+    private Instant endTime;
+
+    public Lesson(String name, Subject subject, Professor professor, Instant startTime, Instant endTime) {
+        this.name = name;
+        this.subject = subject;
+        this.professor = professor;
+        this.startTime = startTime;
+        this.endTime = endTime;
+    }
+}

src/main/java/com/study/course_registration/entity/Professor.java

@@ -0,0 +1,17 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity 
+@NoArgsConstructor 
+@Getter
+@Table(name = "professors")
+public class Professor extends BaseTimeZoneEntity {
+    private String name;
+
+    public Professor(String name) {
+        this.name = name;
+    }
+}

src/main/java/com/study/course_registration/entity/Subject.java

@@ -0,0 +1,23 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity 
+@NoArgsConstructor 
+@Getter 
+@Table(name = "subjects")
+public class Subject extends BaseTimeZoneEntity {
+    private String name;
+
+    private String code;
+
+    private String description;
+
+    public Subject(String name, String code, String description) {
+        this.name = name;
+        this.code = code;
+        this.description = description;
+    }
+}

src/main/java/com/study/course_registration/entity/User.java

@@ -0,0 +1,26 @@
+package com.study.course_registration.entity;
+
+import com.study.course_registration.enums.UserRole;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity
+@Getter 
+@NoArgsConstructor
+@Table(name = "users")
+public class User extends BaseTimeZoneEntity {
+    private String name;
+
+    private Long grade;
+
+    @Enumerated(EnumType.STRING)
+    private UserRole role;
+
+    public User(String name, Long grade, UserRole role) {
+        this.name = name;
+        this.grade = grade;
+        this.role = role;
+    }
+}

src/main/java/com/study/course_registration/entity/UserLesson.java

@@ -0,0 +1,36 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.*;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Entity 
+@NoArgsConstructor
+@Getter
+@Table(name = "user_lessons")
+public class UserLesson extends BaseCreateEntity {
+
+    @EmbeddedId 
+    private UserLessonId id;
+
+    @MapsId("userId")
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn (
+        name = "user_id",
+        foreignKey = @ForeignKey(name = "fk_user_lesson_user_id")
+    )
+    private User user;
+
+    @MapsId("lessonId")
+    @ManyToOne(fetch = FetchType.LAZY)
+    @JoinColumn (
+        name = "lesson_id",
+        foreignKey = @ForeignKey(name = "fk_user_lesson_lesson_id")
+    )
+    private Lesson lesson;
+
+    public UserLesson(User user, Lesson lesson) {
+        this.user = user;
+        this.lesson = lesson;
+    }
+}

src/main/java/com/study/course_registration/entity/UserLessonId.java

@@ -0,0 +1,21 @@
+package com.study.course_registration.entity;
+
+import jakarta.persistence.Embeddable;
+import java.io.Serializable;
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+
+@Embeddable
+@Getter 
+@NoArgsConstructor 
+@EqualsAndHashCode 
+public class UserLessonId implements Serializable {
+    private String userId;
+    private String lessonId;
+    
+    public UserLessonId(String userId, String lessonId) {
+        this.userId = userId;
+        this.lessonId = lessonId;
+    }
+}

src/main/java/com/study/course_registration/enums/UserRole.java

@@ -0,0 +1,5 @@
+package com.study.course_registration.enums;
+
+public enum UserRole {
+    STUDENT, POSTGRADUATE
+}

src/main/java/com/study/course_registration/repository/LessonRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.Lesson;
+
+public interface LessonRepository extends JpaRepository<Lesson, String> {
+    
+}

src/main/java/com/study/course_registration/repository/ProfessorRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.Professor;
+
+public interface ProfessorRepository extends JpaRepository<Professor, String> {
+    
+}

src/main/java/com/study/course_registration/repository/SubjectRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.Subject;
+
+public interface SubjectRepository extends JpaRepository<Subject, String> {
+    
+}

src/main/java/com/study/course_registration/repository/UserLessonRepository.java

@@ -0,0 +1,10 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.UserLesson;
+import com.study.course_registration.entity.UserLessonId;
+
+public interface UserLessonRepository extends JpaRepository<UserLesson, UserLessonId> {
+    
+}

src/main/java/com/study/course_registration/repository/UserRepository.java

@@ -0,0 +1,9 @@
+package com.study.course_registration.repository;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import com.study.course_registration.entity.User;
+
+public interface UserRepository extends JpaRepository<User, String> {
+    
+}

src/main/java/com/study/course_registration/seeder/DataSeeder.java

@@ -0,0 +1,91 @@
+package com.study.course_registration.seeder;
+
+import org.springframework.context.annotation.Profile;
+import org.springframework.stereotype.Component;
+import org.springframework.transaction.annotation.Transactional;
+
+import com.study.course_registration.entity.Lesson;
+import com.study.course_registration.entity.Professor;
+import com.study.course_registration.entity.Subject;
+import com.study.course_registration.entity.User;
+import com.study.course_registration.entity.UserLesson;
+import com.study.course_registration.enums.UserRole;
+import com.study.course_registration.repository.LessonRepository;
+import com.study.course_registration.repository.UserRepository;
+import com.study.course_registration.repository.SubjectRepository;
+import com.study.course_registration.repository.ProfessorRepository;
+import com.study.course_registration.repository.UserLessonRepository;
+
+import java.time.Instant;
+import java.time.ZoneId;
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
+import java.util.List;
+
+import org.springframework.boot.CommandLineRunner;
+
+@Component
+@Profile ("local")
+public class DataSeeder implements CommandLineRunner {
+
+    private static final ZoneId KST = ZoneId.of("Asia/Seoul");
+
+    private final UserRepository userRepository;
+    private final LessonRepository lessonRepository;
+    private final SubjectRepository subjectRepository;
+    private final ProfessorRepository professorRepository;
+    private final UserLessonRepository userLessonRepository;
+
+    public DataSeeder(UserRepository userRepository, LessonRepository lessonRepository, SubjectRepository subjectRepository, ProfessorRepository professorRepository, UserLessonRepository userLessonRepository) {
+        this.userRepository = userRepository;
+        this.lessonRepository = lessonRepository;
+        this.subjectRepository = subjectRepository;
+        this.professorRepository = professorRepository;
+        this.userLessonRepository = userLessonRepository;
+    }
+
+    @Override
+    @Transactional
+    public void run(String... args) throws Exception {
+        if(userRepository.count() > 0) {
+            return;
+        }
+
+        List<Professor> professors = professorRepository.saveAll(List.of(
+            new Professor("김영한"),
+            new Professor("최태영"),
+            new Professor("조재한")
+        ));
+
+        List<Subject> subjects = subjectRepository.saveAll(List.of(
+            new Subject("자바 프로그래밍", "CS201", "자바 프로그래밍 기초"),
+            new Subject("자료구조", "CS202", "자료구조 및 알고리즘"),
+            new Subject("데이터베이스", "CS203", "데이터베이스 시스템")
+        ));
+
+        Instant base = Instant.now().truncatedTo(ChronoUnit.HOURS);
+        List<Lesson> lessons = lessonRepository.saveAll(List.of(
+            new Lesson("자바 프로그래밍", subjects.get(0), professors.get(0), kst(3, 2, 9), kst(3, 2, 11)),
+            new Lesson("자료구조", subjects.get(1), professors.get(1), kst(3, 2, 13), kst(3, 2, 17)),
+            new Lesson("데이터베이스", subjects.get(2), professors.get(2), kst(3, 3, 10), kst(3, 3, 14))
+        ));
+
+        List<User> users = userRepository.saveAll(List.of(
+            new User("학생1", 1L, UserRole.STUDENT),
+            new User("학생2", 2L, UserRole.STUDENT),
+            new User("대학원생", 3L, UserRole.POSTGRADUATE)
+        ));
+
+        List<UserLesson> userLessons = userLessonRepository.saveAll(List.of(
+            new UserLesson(users.get(0), lessons.get(0)),
+            new UserLesson(users.get(0), lessons.get(1)),
+            new UserLesson(users.get(1), lessons.get(1)),
+            new UserLesson(users.get(2), lessons.get(2))
+        ));
+    }
+
+    private Instant kst(int month, int day, int hour) {
+        return ZonedDateTime.of(2026, month, day, hour, 0, 0, 0, KST).toInstant();
+    }
+    
+}

src/main/java/com/study/course_registration/service/CourseRegistrationService.java

@@ -0,0 +1,36 @@
+package com.study.course_registration.service;
+
+import org.springframework.stereotype.Service;
+
+import com.study.course_registration.dto.RequestDto;
+import com.study.course_registration.dto.ResponseDto;
+import com.study.course_registration.repository.LessonRepository;
+import com.study.course_registration.repository.UserLessonRepository;
+import com.study.course_registration.repository.UserRepository;
+import com.study.course_registration.repository.SubjectRepository;
+import com.study.course_registration.repository.ProfessorRepository;
+
+@Service
+public class CourseRegistrationService {
+    private final UserRepository userRepository;
+    private final LessonRepository lessonRepository;
+    private final SubjectRepository subjectRepository;
+    private final ProfessorRepository professorRepository;
+    private final UserLessonRepository userLessonRepository;
+
+    public CourseRegistrationService(UserRepository userRepository, LessonRepository lessonRepository, SubjectRepository subjectRepository, ProfessorRepository professorRepository, UserLessonRepository userLessonRepository) {
+        this.userRepository = userRepository;
+        this.lessonRepository = lessonRepository;
+        this.subjectRepository = subjectRepository;
+        this.professorRepository = professorRepository;
+        this.userLessonRepository = userLessonRepository;
+    }
+
+    public ResponseDto registerCourse(RequestDto requestDto) {
+        
+        return new ResponseDto();
+    }
+}
+// 저장 전 log
+// 검증 로직
+// 

src/main/resources/application-local.yaml

@@ -0,0 +1,21 @@
+spring:
+    datasource:
+        url: jdbc:h2:mem:course_db
+        driver-class-name: org.h2.Driver
+        username: sa
+        password: 
+    jpa:
+        hibernate:
+            ddl-auto: create-drop
+        show-sql: true
+        properties:
+            hibernate:
+                format_sql: true
+    h2:
+        console:
+            enabled: true
+            path: /h2-console
+
+logging:
+    level:
+        org.hibernate.SQL: debug

src/main/resources/application.yaml

@@ -0,0 +1,28 @@
+server:
+    application:
+        name: ${APP_NAME:course-registration}
+    profiles:
+        active: ${APP_PROFILE:local}
+
+spring:
+    jackson:
+        time-zone: UTC
+    h2:
+      console:
+        enabled: true
+        path: /h2-console
+    datasource:
+        url: jdbc:h2:mem:course_db
+        username: sa
+        password: 
+        driver-class-name: org.h2.Driver
+    jpa:
+        hibernate:
+            ddl-auto: create
+        show-sql: true
+        properties:
+            hibernate:
+                format_sql: true
+
+logging.level:
+    org.hibernate.SQL: debug

src/test/java/com/study/course_registration/CourseRegistrationApplicationTests.java

@@ -0,0 +1,13 @@
+package com.study.course_registration;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class CourseRegistrationApplicationTests {
+
+	@Test
+	void contextLoads() {
+	}
+
+}