diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..c2065bc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,37 @@
+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/
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 0000000..4312515
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,53 @@
+plugins {
+    id 'java'
+    id 'org.springframework.boot' version '3.1.6'
+    id 'io.spring.dependency-management' version '1.1.4'
+    id 'org.asciidoctor.jvm.convert' version '3.3.2'
+}
+
+group = 'com.example'
+version = '0.0.1-SNAPSHOT'
+
+java {
+    sourceCompatibility = '17'
+}
+
+configurations {
+    compileOnly {
+        extendsFrom annotationProcessor
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+ext {
+    set('snippetsDir', file("build/generated-snippets"))
+}
+
+dependencies {
+    implementation 'org.springframework.boot:spring-boot-starter-data-jpa'
+    implementation 'org.springframework.boot:spring-boot-starter-jdbc'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+    implementation 'org.springframework.boot:spring-boot-starter-web'
+    compileOnly 'org.projectlombok:lombok'
+    runtimeOnly 'com.h2database:h2'
+    annotationProcessor 'org.projectlombok:lombok'
+    testImplementation 'org.springframework.boot:spring-boot-starter-test'
+    testImplementation 'org.springframework.restdocs:spring-restdocs-mockmvc'
+}
+
+tasks.named('bootBuildImage') {
+    builder = 'paketobuildpacks/builder-jammy-base:latest'
+}
+
+tasks.named('test') {
+    outputs.dir snippetsDir
+    useJUnitPlatform()
+}
+
+tasks.named('asciidoctor') {
+    inputs.dir snippetsDir
+    dependsOn test
+}
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..d64cd49
Binary files /dev/null and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..1af9e09
--- /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-8.5-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..1aa94a4
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,249 @@
+#!/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.
+#
+
+##############################################################################
+#
+#   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/subprojects/plugins/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 "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&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..93e3f59
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,92 @@
+@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
+
+@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.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+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..6b30e33
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1 @@
+rootProject.name = 'seminar'
diff --git a/src/main/java/com/example/seminar/SeventhSeminarApplication.java b/src/main/java/com/example/seminar/SeventhSeminarApplication.java
new file mode 100644
index 0000000..30d05a0
--- /dev/null
+++ b/src/main/java/com/example/seminar/SeventhSeminarApplication.java
@@ -0,0 +1,13 @@
+package com.example.seminar;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SeventhSeminarApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(SeventhSeminarApplication.class, args);
+    }
+
+}
diff --git a/src/main/java/com/example/seminar/controller/CustomerController.java b/src/main/java/com/example/seminar/controller/CustomerController.java
new file mode 100644
index 0000000..a88e22f
--- /dev/null
+++ b/src/main/java/com/example/seminar/controller/CustomerController.java
@@ -0,0 +1,25 @@
+package com.example.seminar.controller;
+
+
+import com.example.seminar.dto.CustomerRequest;
+import com.example.seminar.service.CustomerService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/customers")
+public class CustomerController {
+
+    private final CustomerService customerService;
+
+    @PostMapping
+    public ResponseEntity<Void> createCustomer(@RequestBody CustomerRequest request) {
+        customerService.create(request);
+        return ResponseEntity.ok().build();
+    }
+}
diff --git a/src/main/java/com/example/seminar/controller/MemberController.java b/src/main/java/com/example/seminar/controller/MemberController.java
new file mode 100644
index 0000000..666948a
--- /dev/null
+++ b/src/main/java/com/example/seminar/controller/MemberController.java
@@ -0,0 +1,32 @@
+package com.example.seminar.controller;
+
+
+import com.example.seminar.dto.MemberCreateRequest;
+import com.example.seminar.service.MemberService;
+import lombok.RequiredArgsConstructor;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/members")
+public class MemberController {
+
+    private final MemberService memberService;
+
+    @Autowired
+    public MemberController(MemberService memberService) {
+        this.memberService = memberService;
+    }
+
+    @PostMapping
+    public ResponseEntity<Void> createMember(
+            @RequestBody MemberCreateRequest request) {
+        memberService.create(request);
+        return ResponseEntity.ok().build();
+    }
+
+}
diff --git a/src/main/java/com/example/seminar/controller/PostController.java b/src/main/java/com/example/seminar/controller/PostController.java
new file mode 100644
index 0000000..991ebb7
--- /dev/null
+++ b/src/main/java/com/example/seminar/controller/PostController.java
@@ -0,0 +1,26 @@
+package com.example.seminar.controller;
+
+
+import com.example.seminar.dto.PostRequest;
+import com.example.seminar.service.PostService;
+import jakarta.validation.Valid;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequiredArgsConstructor
+@RequestMapping("/posts")
+public class PostController {
+
+    private final PostService postService;
+
+    @PostMapping
+    public ResponseEntity<Void> createPost(@Valid @RequestBody PostRequest request) {
+        postService.create(request);
+        return ResponseEntity.ok().build();
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/seminar/dto/CustomerRequest.java b/src/main/java/com/example/seminar/dto/CustomerRequest.java
new file mode 100644
index 0000000..7f23afc
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/CustomerRequest.java
@@ -0,0 +1,8 @@
+package com.example.seminar.dto;
+
+public record CustomerRequest(
+        String name,
+        int age,
+        String nickname
+) {
+}
diff --git a/src/main/java/com/example/seminar/dto/MemberCreateRequest.java b/src/main/java/com/example/seminar/dto/MemberCreateRequest.java
new file mode 100644
index 0000000..58a1514
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/MemberCreateRequest.java
@@ -0,0 +1,7 @@
+package com.example.seminar.dto;
+
+public record MemberCreateRequest(
+        String name,
+        int age
+) {
+}
diff --git a/src/main/java/com/example/seminar/dto/PostRequest.java b/src/main/java/com/example/seminar/dto/PostRequest.java
new file mode 100644
index 0000000..e620859
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/PostRequest.java
@@ -0,0 +1,28 @@
+package com.example.seminar.dto;
+
+import jakarta.validation.constraints.AssertTrue;
+import jakarta.validation.constraints.Size;
+
+public record PostRequest(
+
+        @Size(min = 1, max = 50, message = "제목은 1자 이상, 50자 이하로 작성해주세요.")
+        String title,
+
+        String content
+) {
+
+    @AssertTrue(message = "제목은 10자 이상으로 작성해주세요.")
+    public boolean isValidContent() {
+        try {
+            return this.content.length() >= 10;
+        } catch (RuntimeException e) {
+            return false;
+        }
+    }
+
+    public void validateTitle() {
+        if (this.title.isBlank()) {
+            throw new IllegalArgumentException("제목은 공백으로만 이뤄질 수 없습니다.");
+        }
+    }
+}
diff --git a/src/main/java/com/example/seminar/dto/PostRequestV2.java b/src/main/java/com/example/seminar/dto/PostRequestV2.java
new file mode 100644
index 0000000..955f6e2
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/PostRequestV2.java
@@ -0,0 +1,13 @@
+package com.example.seminar.dto;
+
+import jakarta.validation.constraints.Pattern;
+
+public record PostRequestV2(
+
+        @Pattern(regexp = "^[a-zA-Z0-9가-힣\\s]*$", message = "제목은 한글, 영문, 숫자만 입력 가능합니다.")
+        String title,
+
+        String content
+) {
+
+}
diff --git a/src/main/java/com/example/seminar/dto/PostRequestV3.java b/src/main/java/com/example/seminar/dto/PostRequestV3.java
new file mode 100644
index 0000000..cd00e88
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/PostRequestV3.java
@@ -0,0 +1,8 @@
+package com.example.seminar.dto;
+
+public record PostRequestV3(
+        @ValidTitle
+        String title,
+        String content
+) {
+}
diff --git a/src/main/java/com/example/seminar/dto/TitleValidator.java b/src/main/java/com/example/seminar/dto/TitleValidator.java
new file mode 100644
index 0000000..36af52b
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/TitleValidator.java
@@ -0,0 +1,31 @@
+package com.example.seminar.dto;
+
+import jakarta.validation.ConstraintValidator;
+import jakarta.validation.ConstraintValidatorContext;
+
+public class TitleValidator implements ConstraintValidator<ValidTitle, String> {
+
+    private String pattern;
+
+    @Override
+    public void initialize(ValidTitle constraintAnnotation) {
+        this.pattern = constraintAnnotation.pattern();
+    }
+
+    @Override
+    public boolean isValid(String title, ConstraintValidatorContext context) {
+
+        // null, 공백으로만 이뤄지는 경우, 빈 값인 경우 ''
+        if (title.isBlank()) {
+            return false;
+        }
+
+        // 길이가 1보다 작거나 10보다 큰 경우
+        if (title.isEmpty() || title.length() > 10) {
+            return false;
+        }
+
+        // 첫 글자가 공백인 경우
+        return !(title.charAt(0) == ' ');
+    }
+}
diff --git a/src/main/java/com/example/seminar/dto/UsernameValidator.java b/src/main/java/com/example/seminar/dto/UsernameValidator.java
new file mode 100644
index 0000000..ad1e74b
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/UsernameValidator.java
@@ -0,0 +1,16 @@
+package com.example.seminar.dto;
+
+import org.springframework.validation.Errors;
+import org.springframework.validation.Validator;
+
+public class UsernameValidator implements Validator {
+    @Override
+    public boolean supports(Class<?> clazz) {
+        return false;
+    }
+
+    @Override
+    public void validate(Object target, Errors errors) {
+
+    }
+}
diff --git a/src/main/java/com/example/seminar/dto/ValidTitle.java b/src/main/java/com/example/seminar/dto/ValidTitle.java
new file mode 100644
index 0000000..d91162b
--- /dev/null
+++ b/src/main/java/com/example/seminar/dto/ValidTitle.java
@@ -0,0 +1,19 @@
+package com.example.seminar.dto;
+
+
+import jakarta.validation.Constraint;
+
+import java.lang.annotation.Documented;
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+@Documented
+@Constraint(validatedBy = TitleValidator.class)
+@Target({java.lang.annotation.ElementType.FIELD})
+@Retention(java.lang.annotation.RetentionPolicy.RUNTIME)
+public @interface ValidTitle {
+
+    String message() default "Invalid title";
+
+    String pattern() default "[가-힣|a-z|A-Z|0-9|]";
+}
diff --git a/src/main/java/com/example/seminar/entity/CustomerEntity.java b/src/main/java/com/example/seminar/entity/CustomerEntity.java
new file mode 100644
index 0000000..502503d
--- /dev/null
+++ b/src/main/java/com/example/seminar/entity/CustomerEntity.java
@@ -0,0 +1,52 @@
+package com.example.seminar.entity;
+
+
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import org.springframework.util.Assert;
+
+@Entity
+@Table(name = "customer")
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+@Getter
+public class CustomerEntity {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+
+    @NotNull
+    private String name;
+
+    @Column(nullable = false)
+    private String nickname;
+
+    private int age;
+
+    @Builder
+    public CustomerEntity(String name, String nickname, int age) {
+        validateAge(age);
+        validateName(name);
+        validateNickname(nickname);
+        this.name = name;
+        this.nickname = nickname;
+        this.age = age;
+    }
+
+    private void validateNickname(String nickname) {
+        Assert.notNull(nickname, "닉네임은 널이면 안됩니다.");
+    }
+
+    private void validateName(String name) {
+        Assert.notNull(name, "이름은 널이면 안됩니다.");
+    }
+
+    private void validateAge(int age) {
+        Assert.isTrue(age > 0 && age < 200 , "나이는 1살부터 200살 사이로 설정해야합니다.");
+    }
+}
diff --git a/src/main/java/com/example/seminar/entity/MemberEntity.java b/src/main/java/com/example/seminar/entity/MemberEntity.java
new file mode 100644
index 0000000..7fd1996
--- /dev/null
+++ b/src/main/java/com/example/seminar/entity/MemberEntity.java
@@ -0,0 +1,27 @@
+package com.example.seminar.entity;
+
+
+import jakarta.persistence.*;
+import lombok.*;
+
+import java.util.UUID;
+
+@Table(name = "member")
+@Entity @Getter
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class MemberEntity {
+
+    @Id @GeneratedValue(strategy = GenerationType.UUID)
+    private UUID id;
+
+    @Column(nullable = false)
+    private String name;
+
+    private int age;
+
+    @Builder
+    public MemberEntity(String name, int age) {
+        this.name = name;
+        this.age = age;
+    }
+}
diff --git a/src/main/java/com/example/seminar/entity/PostEntity.java b/src/main/java/com/example/seminar/entity/PostEntity.java
new file mode 100644
index 0000000..bfa1988
--- /dev/null
+++ b/src/main/java/com/example/seminar/entity/PostEntity.java
@@ -0,0 +1,27 @@
+package com.example.seminar.entity;
+
+
+import jakarta.persistence.*;
+import jakarta.validation.constraints.NotNull;
+import lombok.AccessLevel;
+import lombok.Builder;
+import lombok.NoArgsConstructor;
+
+@Table(name = "post")
+@Entity
+@NoArgsConstructor(access = AccessLevel.PROTECTED)
+public class PostEntity {
+
+    @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
+    private Long id;
+
+    @NotNull
+    private String title;
+    private String content;
+
+    @Builder
+    public PostEntity(String title, String content) {
+        this.title = title;
+        this.content = content;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/example/seminar/exception/ErrorResponse.java b/src/main/java/com/example/seminar/exception/ErrorResponse.java
new file mode 100644
index 0000000..e158dac
--- /dev/null
+++ b/src/main/java/com/example/seminar/exception/ErrorResponse.java
@@ -0,0 +1,4 @@
+package com.example.seminar.exception;
+
+public record ErrorResponse(String message) {
+}
diff --git a/src/main/java/com/example/seminar/exception/GlobalExceptionHandler.java b/src/main/java/com/example/seminar/exception/GlobalExceptionHandler.java
new file mode 100644
index 0000000..cb63f86
--- /dev/null
+++ b/src/main/java/com/example/seminar/exception/GlobalExceptionHandler.java
@@ -0,0 +1,16 @@
+package com.example.seminar.exception;
+
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ErrorResponse> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
+        return ResponseEntity.badRequest().body(new ErrorResponse(e.getMessage()));
+    }
+}
diff --git a/src/main/java/com/example/seminar/repository/CustomerJpaRepository.java b/src/main/java/com/example/seminar/repository/CustomerJpaRepository.java
new file mode 100644
index 0000000..5eb262a
--- /dev/null
+++ b/src/main/java/com/example/seminar/repository/CustomerJpaRepository.java
@@ -0,0 +1,7 @@
+package com.example.seminar.repository;
+
+import com.example.seminar.entity.CustomerEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface CustomerJpaRepository extends JpaRepository<CustomerEntity, Long> {
+}
diff --git a/src/main/java/com/example/seminar/repository/MemberJpaRepository.java b/src/main/java/com/example/seminar/repository/MemberJpaRepository.java
new file mode 100644
index 0000000..9083b89
--- /dev/null
+++ b/src/main/java/com/example/seminar/repository/MemberJpaRepository.java
@@ -0,0 +1,9 @@
+package com.example.seminar.repository;
+
+import com.example.seminar.entity.MemberEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+import java.util.UUID;
+
+public interface MemberJpaRepository extends JpaRepository<MemberEntity, UUID> {
+}
diff --git a/src/main/java/com/example/seminar/repository/PostJpaRepository.java b/src/main/java/com/example/seminar/repository/PostJpaRepository.java
new file mode 100644
index 0000000..7d8655f
--- /dev/null
+++ b/src/main/java/com/example/seminar/repository/PostJpaRepository.java
@@ -0,0 +1,7 @@
+package com.example.seminar.repository;
+
+import com.example.seminar.entity.PostEntity;
+import org.springframework.data.jpa.repository.JpaRepository;
+
+public interface PostJpaRepository extends JpaRepository<PostEntity, Long> {
+}
diff --git a/src/main/java/com/example/seminar/service/CustomerService.java b/src/main/java/com/example/seminar/service/CustomerService.java
new file mode 100644
index 0000000..3adae12
--- /dev/null
+++ b/src/main/java/com/example/seminar/service/CustomerService.java
@@ -0,0 +1,28 @@
+package com.example.seminar.service;
+
+import com.example.seminar.dto.CustomerRequest;
+import com.example.seminar.entity.CustomerEntity;
+import com.example.seminar.repository.CustomerJpaRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+import org.springframework.web.bind.annotation.PostMapping;
+
+
+@Service
+@RequiredArgsConstructor
+public class CustomerService {
+
+    private final CustomerJpaRepository customerJpaRepository;
+
+    @Transactional
+    public void create(CustomerRequest request) {
+        CustomerEntity customer = CustomerEntity.builder()
+                .name(request.name())
+                .age(request.age())
+                .nickname(request.nickname())
+                .build();
+        System.out.println(customer);
+        customerJpaRepository.save(customer);
+    }
+}
diff --git a/src/main/java/com/example/seminar/service/MemberService.java b/src/main/java/com/example/seminar/service/MemberService.java
new file mode 100644
index 0000000..0ad0bda
--- /dev/null
+++ b/src/main/java/com/example/seminar/service/MemberService.java
@@ -0,0 +1,27 @@
+package com.example.seminar.service;
+
+
+import com.example.seminar.controller.MemberController;
+import com.example.seminar.dto.MemberCreateRequest;
+import com.example.seminar.entity.MemberEntity;
+import com.example.seminar.repository.MemberJpaRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+@Transactional
+public class MemberService {
+
+    private final MemberJpaRepository memberJpaRepository;
+
+    public void create(MemberCreateRequest request) {
+        MemberEntity member = MemberEntity.builder()
+                .name(request.name())
+                .age(request.age())
+                .build();
+        System.out.println(member);
+        memberJpaRepository.save(member);
+    }
+}
diff --git a/src/main/java/com/example/seminar/service/PostService.java b/src/main/java/com/example/seminar/service/PostService.java
new file mode 100644
index 0000000..8066ec2
--- /dev/null
+++ b/src/main/java/com/example/seminar/service/PostService.java
@@ -0,0 +1,28 @@
+package com.example.seminar.service;
+
+
+import com.example.seminar.dto.PostRequest;
+import com.example.seminar.entity.PostEntity;
+import com.example.seminar.repository.PostJpaRepository;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@RequiredArgsConstructor
+@Transactional(readOnly = true)
+public class PostService {
+
+    private final PostJpaRepository postJpaRepository;
+
+
+    @Transactional
+    public void create(PostRequest request) {
+        PostEntity post = PostEntity.builder()
+                .title(request.title())
+                .content(request.content())
+                .build();
+        postJpaRepository.save(post);
+    }
+
+}
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
new file mode 100644
index 0000000..8b13789
--- /dev/null
+++ b/src/main/resources/application.properties
@@ -0,0 +1 @@
+
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
new file mode 100644
index 0000000..25c577d
--- /dev/null
+++ b/src/main/resources/application.yml
@@ -0,0 +1,19 @@
+# default profile
+spring:
+  datasource:
+    driver-class-name: org.h2.Driver
+    url: jdbc:h2:tcp://localhost/~/test
+    username: sa
+    password:
+  config:
+    activate:
+      on-profile: local
+
+  jpa:
+    show-sql: true
+    hibernate:
+      ddl-auto: create
+    properties:
+      hibernate:
+        format_sql: true
+        show_sql: true
\ No newline at end of file
diff --git a/src/test/java/com/example/seminar/SeventhSeminarApplicationTests.java b/src/test/java/com/example/seminar/SeventhSeminarApplicationTests.java
new file mode 100644
index 0000000..a121689
--- /dev/null
+++ b/src/test/java/com/example/seminar/SeventhSeminarApplicationTests.java
@@ -0,0 +1,13 @@
+package com.example.seminar;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+
+@SpringBootTest
+class SeventhSeminarApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+
+}
diff --git a/src/test/java/com/example/seminar/domain/CustomerEntityTest.java b/src/test/java/com/example/seminar/domain/CustomerEntityTest.java
new file mode 100644
index 0000000..bef2845
--- /dev/null
+++ b/src/test/java/com/example/seminar/domain/CustomerEntityTest.java
@@ -0,0 +1,68 @@
+package com.example.seminar.domain;
+
+
+import com.example.seminar.entity.CustomerEntity;
+import com.example.seminar.repository.CustomerJpaRepository;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThatThrownBy;
+
+@SpringBootTest
+public class CustomerEntityTest {
+
+    @Autowired
+    CustomerJpaRepository customerJpaRepository;
+
+
+    @Nested
+    @DisplayName("Customer 생성 관련 Test")
+    class CustomerCreateTest {
+        private static final String NAME = "홍길동";
+        private static final int INVALID_AGE = -1;
+        private static final int AGE = 20;
+        private static final String NICKNAME = "hong";
+
+        @DisplayName("나이가 1이상 200이하인 경우 Customer 객체 생성을 실패한다.")
+        @Test
+        void createInvalidAgeCustomerTest() {
+            assertThatThrownBy(() ->
+                    CustomerEntity.builder()
+                            .name(NAME)
+                            .age(INVALID_AGE)
+                            .nickname(NICKNAME)
+                            .build())
+                    .isInstanceOf(IllegalArgumentException.class)
+                    .hasMessage("나이는 1살부터 200살 사이로 설정해야합니다.");
+        }
+
+        @DisplayName("닉네임은 null인 경우 Customer 객체 생성을 실패한다.")
+        @Test
+        void createNullNicknameCustomerTest() {
+            assertThatThrownBy(() ->
+                    CustomerEntity.builder()
+                            .name(NAME)
+                            .age(AGE)
+                            .nickname(null)
+                            .build())
+                    .isInstanceOf(IllegalArgumentException.class)
+                    .hasMessage("닉네임은 널이면 안됩니다.");
+        }
+
+        @DisplayName("이름은 null인 경우 Customer 객체 생성을 실패한다.")
+        @Test
+        void createNullNameCustomerTest() {
+            assertThatThrownBy(() ->
+                    CustomerEntity.builder()
+                            .name(null)
+                            .age(AGE)
+                            .nickname(NICKNAME)
+                            .build())
+                    .isInstanceOf(IllegalArgumentException.class)
+                    .hasMessage("이름은 널이면 안됩니다.");
+        }
+    }
+}
diff --git a/src/test/java/com/example/seminar/domain/PostEntityTest.java b/src/test/java/com/example/seminar/domain/PostEntityTest.java
new file mode 100644
index 0000000..4dbfd2c
--- /dev/null
+++ b/src/test/java/com/example/seminar/domain/PostEntityTest.java
@@ -0,0 +1,37 @@
+package com.example.seminar.domain;
+
+import com.example.seminar.entity.PostEntity;
+import com.example.seminar.repository.PostJpaRepository;
+import jakarta.validation.ConstraintViolationException;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+@SpringBootTest
+public class PostEntityTest {
+
+    @Autowired
+    PostJpaRepository postJpaRepository;
+
+    @Nested
+    @DisplayName("Post 생성 관련 Test")
+    class CreatePostEntityTest {
+        private static final String TITLE = "테스트 제목";
+        private static final String CONTENT = "테스트 내용";
+
+        @DisplayName("제목이 null인 경우 Post 객체 생성을 실패한다.")
+        @Test
+        void test_createNullTitlePostEntity() {
+            assertThatThrownBy(() ->
+                    postJpaRepository.save(PostEntity.builder()
+                                    .title(null)
+                                    .content(CONTENT)
+                                    .build()))
+                            .isInstanceOf(ConstraintViolationException.class);
+        }
+    }
+}