[Java] maven

title: "[Java] maven"
date: 2019-01-01 01:39:59

Maven

외부 라이브러리 jar 추가하기

1) 외부 jar가 위치한 폴더 추가

<repositories>
    <repository>
        <id>local-maven-repo</id>
        <url>file:///${project.basedir}/libs</url>
    </repository>
</repositories>

2) dependency 추가

• groupId/artifactId/version 정보는 외부 jar 파일에 포함된 pom.properties 파일을 참고

• /META-INF/maven/demo/pom.properties

  <dependencies>
    <dependency>
        <groupId>com.demo</groupId>
        <artifactId>demo</artifactId>
        <version>2.0.3</version>
    </dependency>
  </dependencies>

실행 가능한 jar 만들기

1) maven-assembly-plugin

• 외부 jar 파일도 함께 포함된 실행 가능한 jar 파일 생성

• 외부 라이브러리 jar 파일이 빌드 결과 실행 jar 파일에 jar 형식으로 포함되지 않고 압축이 다 풀린 class 구조로 포함이 됨

  <project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.demo.executejar</groupId>
    <artifactId>executeDemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
  
    <properties>
        <project.build.sourceEncoding>utf-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>utf-8</project.reporting.outputEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
  
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                        <configuration>
                            <archive>
                                <manifest>
                                    <!-- main class path -->
                                    <mainClass>
                                        executeDemo.demo.StartMain
                                    </mainClass>
                                </manifest>
                            </archive>
                            <descriptorRefs>
                                <descriptorRef>jar-with-dependencies</descriptorRef>
                            </descriptorRefs>
                            <appendAssemblyId>false</appendAssemblyId>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
  </project>
  

### 2) Eclipse Export 기능 사용
- 테스트 : STS 4.0
- File -> Export -> Java -> Runnable JAR File



## rt.jar 에러  
- maven-compiler-plugin 설정에 -XDignore.symbol.file 옵션 추가 

``` xml
<plugin>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
        <source>1.8</source>
        <target>1.8</target>
        <fork>true</fork>
        <compilerArgs>
            <arg>-XDignore.symbol.file</arg>
        </compilerArgs>
    </configuration>
</plugin>

참고

• 특정 버전 셋팅

  • https://maven.apache.org/plugins/maven-compiler-plugin/examples/set-compiler-source-and-target.html

• javac 옵션

  • https://docs.oracle.com/javase/8/docs/technotes/tools/windows/javac.html

• java jar

  • https://docs.oracle.com/javase/tutorial/deployment/jar/index.html

• How to Create an Executable JAR with Maven

  • https://www.baeldung.com/executable-jar-with-maven