Srping boot + gradle + jpa 설정

✅ 1. Gradle 설정 (build.gradle.kts)

plugins {
    id("org.springframework.boot") version "3.2.5"
    id("io.spring.dependency-management") version "1.1.5"
    kotlin("jvm") version "1.9.23" // Kotlin 사용 시
    kotlin("plugin.spring") version "1.9.23"
    // kotlin("plugin.jpa") version "1.9.23" // Kotlin + JPA 사용할 경우
}

group = "com.example"
version = "0.0.1-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_17

repositories {
    mavenCentral()
}

dependencies {
    implementation("org.springframework.boot:spring-boot-starter-data-jpa")
    implementation("org.springframework.boot:spring-boot-starter-web")
    runtimeOnly("com.h2database:h2") // 테스트용 DB
    testImplementation("org.springframework.boot:spring-boot-starter-test")
}

☝️ Java를 사용할 경우 Kotlin 관련 플러그인은 제거하세요.

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✅ 2. application.yml 설정

src/main/resources/application.yml

spring:
  datasource:
    url: jdbc:h2:mem:testdb
    driver-class-name: org.h2.Driver
    username: sa
    password:
  jpa:
    hibernate:
      ddl-auto: update  # create, create-drop, validate, update 등 선택
    show-sql: true
    properties:
      hibernate:
        format_sql: true
  h2:
    console:
      enabled: true

---

✅ 3. 엔티티 클래스 예시

// Java 예제
package com.example.demo.entity;

import jakarta.persistence.*;

@Entity
public class Member {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    // getters, setters
}

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✅ 4. 리포지토리 인터페이스

package com.example.demo.repository;

import com.example.demo.entity.Member;
import org.springframework.data.jpa.repository.JpaRepository;

public interface MemberRepository extends JpaRepository<Member, Long> {
}

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✅ 5. 테스트용 컨트롤러

package com.example.demo.controller;

import com.example.demo.entity.Member;
import com.example.demo.repository.MemberRepository;
import org.springframework.web.bind.annotation.*;

import java.util.List;

@RestController
@RequestMapping("/members")
public class MemberController {
    private final MemberRepository repository;

    public MemberController(MemberRepository repository) {
        this.repository = repository;
    }

    @PostMapping
    public Member save(@RequestBody Member member) {
        return repository.save(member);
    }

    @GetMapping
    public List<Member> findAll() {
        return repository.findAll();
    }
}

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🔁 실행

Gradle로 프로젝트 실행:

./gradlew bootRun

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✅ 추가 팁

• MySQL 같은 실제 DB를 쓰려면 runtimeOnly("mysql:mysql-connector-java") 추가하고, application.yml에서 spring.datasource.url을 바꾸면 됩니다.
• ddl-auto는 운영 환경에선 validate 또는 none을 사용하는 것이 좋습니다.