Shade Plugin은 매우 쓸모가 많은 Plugin입니다. Classpath에서 외부 라이브러리 사용시 Conflict가 났을 때 참 처리하기 어렵니다. Shade Plugin을 사용하면 JAR 파일의 패키지를 다른 패키지로 이동할 수 있습니다.

아래 예제는 Netty 4의 패키지를 변경하는 예제입니다.

<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>pilot.maven</groupId>
    <artifactId>maven-shade</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>maven-shade</name>
 
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.1.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <shadedArtifactAttached>true</shadedArtifactAttached>
                            <shadedClassifierName>jackofall</shadedClassifierName>
 
                            <relocations>
                                <relocation>
                                    <pattern>io.netty</pattern>
                                    <shadedPattern>com.mycompany.netty</shadedPattern>
                                </relocation>
                            </relocations>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
 
    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>
 
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty-all</artifactId>
            <version>4.1.17.Final</version>
        </dependency>
    </dependencies>
</project>