초간단 Gradle build 테스트

1. 프로젝트 디렉토리 생성

$ mkdir -p gradle-test

---

2. 소스 코드 작성

$ cd gradle-test
$ mkdir -p src/main/java/test

따라서 gradle-test/src/main/java/test 구조가 디렉토리가 있는 것이다.

2.1. Hello.java

package test;

public class Hello {
  public static void main(String[] args) {
     You you = new You();
     System.out.println(you.say());
  }
}

2.2. You.java

package test;

public class You {
  public String say() {
    return "Hello world!";
  }
}

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3. build.gradle 파일

이 파일은 gradle-test 하위에 있으면 된다.

apply plugin: 'java'

---

4. Gradle Build

# gradle build

BUILD SUCCESSFUL in 1s
2 actionable tasks: 2 executed

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5. 확인

build 디렉토리 생성되고 그 안에 class 파일들이 생성된다.

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6. Dependency 설정

6.1. You.java 수정

package test;

import org.joda.time.LocalTime;

public class You {
  public String say() {
    LocalTime currentTime = new LocalTime();
    return "Hello world! " + currentTime;
  }

6.2. 빌드

# gradle build

> Task :compileJava FAILED
/src/gradle-test/src/main/java/test/You.java:3: error: package org.joda.time does not exist
import org.joda.time.LocalTime;
                    ^
/src/gradle-test/src/main/java/test/You.java:7: error: cannot find symbol
    LocalTime currentTime = new LocalTime();
    ^
  symbol:   class LocalTime
  location: class You
/src/gradle-test/src/main/java/test/You.java:7: error: cannot find symbol
    LocalTime currentTime = new LocalTime();
                                ^
  symbol:   class LocalTime
  location: class You
3 errors

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 1s
1 actionable task: 1 executed

6.3. build.gradle 수정

apply plugin: 'java'

repositories { mavenCentral() }
dependencies {
  compile "joda-time:joda-time:2.2"
}

6.4 재빌드

# gradle build

BUILD SUCCESSFUL in 6s
2 actionable tasks: 2 executed

---

7. (참고) gradle.build 예제

plugins {
	id 'org.springframework.boot' version '2.1.7.RELEASE'
	id 'io.spring.dependency-management' version '1.0.8.RELEASE'
	id 'java'
}

group = 'io.pivotal.cloud'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '1.8'

configurations {
	developmentOnly
	runtimeClasspath {
		extendsFrom developmentOnly
	}
}

repositories {
	mavenCentral()
}

ext {
	set('springCloudVersion', "Greenwich.SR2")
}

dependencies {
	implementation 'org.springframework.boot:spring-boot-starter-amqp'
	implementation 'org.springframework.boot:spring-boot-starter-web'
	implementation 'org.springframework.cloud:spring-cloud-stream'
	implementation 'org.springframework.cloud:spring-cloud-stream-binder-rabbit'
	developmentOnly 'org.springframework.boot:spring-boot-devtools'
	testImplementation 'org.springframework.boot:spring-boot-starter-test'
	testImplementation 'org.springframework.cloud:spring-cloud-stream-test-support'
	compileOnly "org.springframework.boot:spring-boot-configuration-processor"
}

dependencyManagement {
	imports {
		mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
	}
}

compileJava.dependsOn(processResources)