# spring start

## lombok 설정

`lombok.config` 파일을 프로젝트 root 디렉토리에 위치 시킨다.

```systemd
lombok.Setter.flagUsage = error
lombok.AllArgsConstructor.flagUsage = error
lombok.data.flagUsage= error
lombok.ToString.flagUsage = warning
lombok.anyConstructor.addConstructorProperties=true

# https://www.baeldung.com/lombok-configuration-system
# https://velog.io/@shinhyocheol/Lombok-%EA%B3%BC-Jackson-Deserialize-%EA%B4%80%EA%B3%84
```

* `@Setter`, `@AllArgsConstructor`, `@Data` 와 같은 lombok 기능을 제한하고 싶을 때 사용
* `@ToString` 은 warning 으로 관리할 수 있다. (순환 참조 문제가 발생할 수 있기 때문에)
* `lombok.anyConstructor.addConstructorProperties=true` : Jackson 라이브러리의 deserialize 를 도와주는 `@ConstructorProperties` 기능을 모든 생성자에 추가하는 옵션

<https://velog.io/@shinhyocheol/Lombok-%EA%B3%BC-Jackson-Deserialize-%EA%B4%80%EA%B3%84>

## Spring Data JPA

개발단계에서 쿼리를 찍어보는 설정이 중요하다.

```yaml
spring:
  datasource:
  url: jdbc:h2:tcp://localhost/~/datajpa
  username: sa
  password:
  driver-class-name: org.h2.Driver
jpa:
  hibernate:
    ddl-auto: create
  properties:
    hibernate:
#      show_sql: true
      format_sql: true
logging.level:
  org.hibernate.SQL: debug
#  org.hibernate.type: trace
```

* `show_sql: true` 옵션은 쿼리 로그 출력을 logger 가 아닌 System.out 으로 콘솔에 남긴다. (사용하지 말자)
* 쿼리 파라미터 로그를 남기기 위한 방법으로 외부 라이브러리를 사용하는 방법이 있다.
  * <https://github.com/gavlyukovskiy/spring-boot-data-source-decorator>

```gradle
implementation 'com.github.gavlyukovskiy:p6spy-spring-boot-starter:1.9.0'
```

<details>

<summary>build.gradle</summary>

```gradle
plugins {
     id ‘org.springframework.boot’ version ‘2.2.1.RELEASE’
     id ‘io.spring.dependency-management’ version ‘1.0.8.RELEASE’
     id ‘java’
}
 group = ‘study’
 version = ‘0.0.1-SNAPSHOT’
 sourceCompatibility = ‘1.8’
 configurations {
     compileOnly {
         extendsFrom annotationProcessor
     }
}
 repositories {
     mavenCentral()
}
 dependencies {
     implementation ‘org.springframework.boot:spring-boot-starter-data-jpa’
     implementation ‘org.springframework.boot:spring-boot-starter-web’
     implementation ‘com.github.gavlyukovskiy:p6spy-spring-boot-starter:1.5.7’
     compileOnly ‘org.projectlombok:lombok’
     runtimeOnly ‘com.h2database:h2’
     annotationProcessor ‘org.projectlombok:lombok’
     testImplementation(‘org.springframework.boot:spring-boot-starter-test’) {
         exclude group: ‘org.junit.vintage’, module: ‘junit-vintage-engine’
     }
}
 test {
     useJUnitPlatform()
}
```

</details>

## 멀티 모듈


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