Maven으로 Java 프로젝트 생성하기

Maven 설치

본 글에서는 MacOS 환경에서 Maven을 설치하고, Homebrew를 이용한다.

# MacOSX
brew install maven

 

설치 완료 후 버전 확인

$ mvn --version
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /usr/local/Cellar/maven/3.6.3_1/libexec
Java version: 14.0.1, vendor: N/A, runtime: /usr/local/Cellar/openjdk/14.0.1/libexec/openjdk.jdk/Contents/Home
Default locale: ko_KR, platform encoding: UTF-8
OS name: "mac os x", version: "10.15.5", arch: "x86_64", family: "mac"

 

Maven으로 Java 프로젝트 생성하기

archetype:generate 옵션을 넣어 프로젝트를 생성한다.

$ mvn archetype:generate -DgroupId=com.exam -DartifactId=crawler -DarchetypeArtifactId=maven-archetype-quickstart -Dversion=1.0.0-SNAPSHOT
...중략...
Confirm properties configuration:
groupId: com.exam
artifactId: crawler
version: 1.0.0-SNAPSHOT
package: com.exam
 Y: :  Y	# 위 내용 확인 후 'Y' 입력
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  47.231 s
[INFO] Finished at: 2020-09-11T19:04:15+09:00
[INFO] ------------------------------------------------------------------------

옵션 설명

• -DgroupId: 프로젝트 패키지 (그룹 ID)
• -DartifactId: 프로젝트 명 (아티팩트 ID)
• -DarchetypeArtifactId: Maven 템플릿
• -Dversion: 버전

 

프로젝트 생성 확인

InteliJ에서 실행

 

Maven 패키징

clean package 옵션으로 실행한다.

• clean: 이전에 만들어진 산출물을 삭제
• pacakge: 컴파일 -> 테스트 -> 빌드 과정을 한번에 해준다.

$ mvn clean package

[INFO] Scanning for projects...
[INFO] 
[INFO] --------------------------< com.exam:crawler >--------------------------
[INFO] Building crawler 1.0.0-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ crawler ---
[INFO] Deleting /Users/hong/dev/crawler/target
...중략...
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ crawler ---
[INFO] Surefire report directory: /Users/hong/dev/crawler/target/surefire-reports
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.pom (1.7 kB at 1.5 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-providers/2.12.4/surefire-providers-2.12.4.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-providers/2.12.4/surefire-providers-2.12.4.pom (2.3 kB at 7.7 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/surefire/surefire-junit3/2.12.4/surefire-junit3-2.12.4.jar (26 kB at 55 kB/s)

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running com.exam.AppTest
Tests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.006 sec

Results :

Tests run: 1, Failures: 0, Errors: 0, Skipped: 0

[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ crawler ---
[INFO] Building jar: /Users/hong/dev/crawler/target/crawler-1.0.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  3.527 s
[INFO] Finished at: 2020-09-11T19:11:25+09:00
[INFO] ------------------------------------------------------------------------

 

패키징된 산출물은 target/{artifactID}-{version}.jar로 생성된다.

 

오류 발생하면?

만약, 아래와 같은 오류가 발생하면 pom.xml에 Java의 source, target 버전을 넣어, Maven Compiler가 알 수 있도록 명시하자.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project crawler: Compilation failure: Compilation failure: 
[ERROR] Source option 5 is no longer supported. Use 7 or later.
[ERROR] Target option 5 is no longer supported. Use 7 or later.

 

pom.xml 에 아래 내용 추가

<properties>
  <maven.compiler.source>1.8</maven.compiler.source>
  <maven.compiler.target>1.8</maven.compiler.target>
</properties>