Create a fat Jar file Maven Shade Plugin

摘要: In this tutorial, we will show you how to use Maven Shade Plugin to create a Jar together with its dependency Jars into a single executable Jar file, so called fat Jar or uber Jar.

In this tutorial, we will show you how to use Maven Shade Plugin to create a Jar together with its dependency Jars into a single executable Jar file, so called fat Jar or uber Jar.

Note
Maven Shade plugin is a better plugin to create fat/uber jar, if compare with assembly plugin, because it provides class relocating feature, to avoid same class name conflict in the classpath.

1. Review a Java project

Previous Java project (dateutils) will be reused, see following folder structure

Note
This project has a single dependency – joda-time.jar

2. Pom.xml

Read below comment for self-explanatory.

pom.xml
<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.mkyong.core.utils</groupId>
	<artifactId>dateUtils</artifactId>
	<packaging>jar</packaging>
	<version>1.0-SNAPSHOT</version>
	<name>dateUtils</name>
	<url>http://maven.apache.org</url>
	<properties>
		<jdk.version>1.7</jdk.version>
		<jodatime.version>2.5</jodatime.version>
		<junit.version>4.11</junit.version>
	</properties>
	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>${junit.version}</version>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>joda-time</groupId>
			<artifactId>joda-time</artifactId>
			<version>${jodatime.version}</version>
		</dependency>
	</dependencies>
	<build>
		<finalName>dateutils</finalName>
		<plugins>
			<!-- download source code in Eclipse, best practice -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-eclipse-plugin</artifactId>
				<version>2.9</version>
				<configuration>
					<downloadSources>true</downloadSources>
					<downloadJavadocs>false</downloadJavadocs>
				</configuration>
			</plugin>
			<!-- Set a compiler level -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>2.3.2</version>
				<configuration>
					<source>${jdk.version}</source>
					<target>${jdk.version}</target>
				</configuration>
			</plugin>
		<!-- Maven Shade Plugin -->
		<plugin>
		  <groupId>org.apache.maven.plugins</groupId>
		  <artifactId>maven-shade-plugin</artifactId>
		  <version>2.3</version>
		  <executions>
		     <!-- Run shade goal on package phase -->
		    <execution>
			<phase>package</phase>
			<goals>
				<goal>shade</goal>
			</goals>
			<configuration>
			  <transformers>
				<!-- add Main-Class to manifest file -->
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
					<mainClass>com.mkyong.core.utils.App</mainClass>
				</transformer>
			  </transformers>
			</configuration>
		      </execution>
		  </executions>
		</plugin>
		</plugins>
	</build>
</project>

3. Package It

To produces the final Jar, just package it :

$ mvn package
[INFO] 
[INFO] --- maven-jar-plugin:2.4:jar (default-jar) @ dateUtils ---
[INFO] Building jar: /Users/mkyong/dateUtils/target/dateutils.jar
[INFO] 
[INFO] --- maven-shade-plugin:2.3:shade (default) @ dateUtils ---
[INFO] Including joda-time:joda-time:jar:2.5 in the shaded jar.
[INFO] Replacing original artifact with shaded artifact.
[INFO] Replacing /Users/mkyong/dateUtils/target/dateutils.jar with /Users/mkyong/dateUtils/target/dateUtils-1.0-SNAPSHOT-shaded.jar
[INFO] Dependency-reduced POM written at: /Users/mkyong/dateUtils/dependency-reduced-pom.xml
[INFO] Dependency-reduced POM written at: /Users/mkyong/dateUtils/dependency-reduced-pom.xml
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.594s
[INFO] Finished at: Tue Oct 21 15:24:28 MYT 2014
[INFO] Final Memory: 17M/42M
[INFO] ------------------------------------------------------------------------

Two jar files will be created in the target folder.

  1. dateutils.jar – Project and dependency classes in a single jar, this is what you want.
  2. original-dateutils.jar – Only your project classes

P.S The generated dependency-reduced-pom.xml is for reference only, just ignore it.

4. Review It

List out the content of dateutils.jar

$ jar tf target/dateutils.jar 
META-INF/MANIFEST.MF
META-INF/
com/
com/mkyong/
com/mkyong/core/
com/mkyong/core/utils/
com/mkyong/core/utils/App.class
META-INF/maven/
META-INF/maven/com.mkyong.core.utils/
META-INF/maven/com.mkyong.core.utils/dateUtils/
META-INF/maven/com.mkyong.core.utils/dateUtils/pom.xml
META-INF/maven/com.mkyong.core.utils/dateUtils/pom.properties
META-INF/LICENSE.txt
META-INF/NOTICE.txt
org/
org/joda/
org/joda/time/
org/joda/time/base/
org/joda/time/base/AbstractDateTime.class
org/joda/time/base/AbstractDuration.class
//...
org/joda/time/Weeks.class
org/joda/time/YearMonth$Property.class
org/joda/time/YearMonth.class
org/joda/time/YearMonthDay$Property.class
org/joda/time/YearMonthDay.class
org/joda/time/Years.class
META-INF/maven/joda-time/
META-INF/maven/joda-time/joda-time/
META-INF/maven/joda-time/joda-time/pom.xml
META-INF/maven/joda-time/joda-time/pom.properties
MANIFEST.MF
Manifest-Version: 1.0
Build-Jdk: 1.7.0_05
Built-By: mkyong
Created-By: Apache Maven 3.1.1
Main-Class: com.mkyong.core.utils.App
Archiver-Version: Plexus Archiver

Run it

$ java -jar target/dateutils.jar 
2014-10-21

References

  1. Apache Maven Shade Plugin
  2. Apache Maven Assembly Plugin
  3. Create A Fat Jar File – Maven One-JAR Example
  4. Create a fat Jar file – Maven Assembly Plugin
  5. How to create a jar file with Maven

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