How to run a maven created jar file using just the command line

Question

I need some help trying to run the following maven project using the command line: https://github.com/sarxos/webcam-capture, the webcam-capture-qrcode example is the one I'm trying to run. I have it running using an the Eciplse IDE but need to move it over to just using the command line. I have the jar's created by maven.

I'm trying

java -classpath ./webcam-capture/target/webcam-capture-0.3.10-SNAPSHOT.jar  com.github.sarxos.webcam.WebcamQRCodeExample

but I keep getting the

Exception in thread "main" java.lang.NoClassDefFoundError: com/github/sarxos/webcam/WebcamQRCodeExample
Caused by: java.lang.ClassNotFoundException: com.github.sarxos.webcam.WebcamQRCodeExample

score 148 · Answer 1 · edited Jul 26 '17 at 14:51

148

Just use the exec-maven-plugin.

<build>
    <plugins>
        <plugin>
            <groupId>org.codehaus.mojo</groupId>
            <artifactId>exec-maven-plugin</artifactId>
            <version>1.2.1</version>
            <configuration>
                <mainClass>com.example.Main</mainClass>
            </configuration>
        </plugin>
    </plugins>
</build>

Then you run you program:

mvn exec:java

edited Jul 26 '17 at 14:51

mss

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answered Apr 08 '13 at 06:52

maba

47,113
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4

Where should I add that? To the main project pom.xml? – Oujk Apr 08 '13 at 15:01
@Oujk Yes, to the pom file – maba Apr 08 '13 at 15:44
1

Which one? There is a pom.xml for almost every single directory in the project. – Oujk Apr 08 '13 at 18:41
@Oujk Normally the one where your main class is in. In your case where you have com.github.sarxos.webcam.WebcamQRCode. Dependencies will be resolved by maven as usual. – maba Apr 08 '13 at 18:52
where should execute this last mvn command? My system may not have maven installed. I need to distribute that jar for client without any more information. – MrYo Aug 13 '15 at 09:44
Don't forget to specify your Main class in the tag. – raafaar Nov 27 '20 at 21:58
This approach is normal fine. Except when you have lots of command line arguments to pass to the program this gets ridiculous. – William Entriken Feb 19 '21 at 01:00
But this does not make a runnable jar file – Celsiuss Mar 01 '21 at 21:59

score 21 · Answer 2 · answered Apr 21 '14 at 10:23

1st Step: Add this content in pom.xml

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-shade-plugin</artifactId>
            <version>2.1</version>
            <executions>
                <execution>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <transformers>
                            <transformer
                                implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                            </transformer>
                        </transformers>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

2nd Step : Execute this command line by line.

cd /go/to/myApp
mvn clean
mvn compile 
mvn package
java -cp target/myApp-0.0.1-SNAPSHOT.jar go.to.myApp.select.file.to.execute

score 16 · Answer 3 · answered Jul 25 '16 at 01:41

16

Use this command.

mvn package

to make the package jar file. Then, run this command.

java -cp target/artifactId-version-SNAPSHOT.jar package.Java-Main-File-Name

after mvn package command. Target folder with classes, test classes, jar file and other resources folder and files will be created.

type your own artifactId, version and package and java main file.

answered Jul 25 '16 at 01:41

Hafiz Shehbaz Ali

2,566
25
21

i used this method and i'm getting 'could not find or load main' error. I ran this: java -cp TwitterMapReduce-1.0-SNAPSHOT.jar hadoop.TwitterJob after doing mvn package. Any ideas why? – Hana Mar 16 '19 at 02:50
5

This alone will not work when the jar file has dependencies. The Maven exec plugin suggested by maba will _find_ the dependencies, while the Maven shade plugin suggested by Mohammed will _package_ them. – Sep 12 '19 at 12:43

score 4 · Answer 4 · edited May 23 '17 at 12:10

4

I am not sure in your case. But as I know to run any jar file from cmd we can use following command:

Go up to the directory where your jar file is saved:

java -jar <jarfilename>.jar

But you can check following links. I hope it'll help you:

Run Netbeans maven project from command-line?

http://www.sonatype.com/books/mvnref-book/reference/running-sect-options.html

edited May 23 '17 at 12:10

Community

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answered Apr 08 '13 at 04:36

Shailesh Saxena

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5

That only works if there is manifest in the jar; in this case there is none. Thank you though. – Oujk Apr 08 '13 at 05:12
6

A maven jar does not include dependencies – Top Sekret Apr 02 '16 at 19:34

How to run a maven created jar file using just the command line

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