how to package jar file include classes in jar files

Question

My project have some dependcies which are jar files. My project will be packaged as a jar file.

Is it possible to package all files including classes compiled from sources of my project and all classes under depended jar files. I am using JDK 1.6+.

If it is possible, how to do that using command or ant or Eclipse?

score 2 · Accepted Answer · answered Jul 30 '14 at 03:45

Copy dependency jar class files into the project jar file:

Use Maven plugin maven-shade-plugin by command: mvn package

All the class files under <dependencies> will be included in your project jar file.

<dependencies>
    <dependency>
        <groupId>com.googlecode.json-simple</groupId>
        <artifactId>json-simple</artifactId>
        <version>1.1.1</version>
        <type>jar</type>
    </dependency>
    <dependency>
        <groupId>javax.mail</groupId>
        <artifactId>mail</artifactId>
        <version>1.4.5</version>
    </dependency>
</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                </execution>
            </executions>
            <configuration>
                <finalName>Test.jar</finalName>
            </configuration>
        </plugin>
    </plugins>
</build>

score 1 · Answer 2 · answered Jul 28 '14 at 12:01

1

What you asked is possible. but not a good way to do that. Jar files are like components and should stay in their own jar files. If you include all the class files into one jar, it is impossible to reuse them and your jar file will be too large.

I recommend you use Maven (http://maven.apache.org), which can manage your dependency for you.

answered Jul 28 '14 at 12:01

sendon1982

9,982
61
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Yes, I need a fat jar, just for now. – Nick Dong Jul 30 '14 at 02:20
In this case, you can use Maven plugin which can do this. – sendon1982 Jul 30 '14 at 03:42

score 0 · Answer 3 · answered Jul 28 '14 at 10:59

0

Use Export option in eclipse. Export->Runnable Jar and select the option "Package the required libraries into generated jar"

This should fit your needs.

HTH, Keshava.

answered Jul 28 '14 at 10:59

Keshava

702
1
7
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Please refer another post here http://stackoverflow.com/questions/8828493/how-to-do-eclipses-export-jar-from-the-command-line Also see ANT example http://ant.apache.org/manual/tutorial-HelloWorldWithAnt.html . – Keshava Jul 28 '14 at 11:14
That would be using jar xvf to unpack other packages and then using mv to move their classes to the target folder and then using jar cvf to create the target jar. Is it the elegant way? Is there any alternative ways? @Keshava – Nick Dong Jul 30 '14 at 02:13
For eclipse, Is that can do same thing when building project automatically not export manually? – Nick Dong Jul 30 '14 at 02:15

how to package jar file include classes in jar files

3 Answers3