How to execute a java main class from the command line

Question

My class:

package com.your.company.cli;

import com.github.domain.cli.Cli;
import com.your.company.utils.MySuperClass;

public class Hello {
    public static void main(String[] args) throws TechnicalException {
        new Cli().runcli(MySuperClass.class, args);
    }
}

On my Eclipse is OK:

I need run my class by a command line. (after compile by Maven (mvn clean install))

java -cp .... ???? com.your.company.cli.Hello ... ???

EDIT 1:

I try java -jar myproject.jar

aucun attribut manifest principal dans myproject.jar

I try java -cp myproject.jar com.your.company.cli.Hello

impossible de trouver la classe principale com.your.company.cli.Hello

EDIT 2:

I try add maven-jar-plugin but my result is a Maven jar (not a fat jar). I looking for a solution with commande line without jar file please (juste the same behavior as on Eclipse).

mvn clean install didn't create a jar file under target folder ? — Elarbi Mohamed Aymen
– Elarbi Mohamed Aymen, Commented Apr 17, 2018 at 21:44
'java -jar myproject.jar' do not work. aucun attribut manifest principal dans myproject.jar — Stéphane GRILLON
– Stéphane GRILLON, Commented Apr 17, 2018 at 21:54

Stéphane GRILLON · Accepted Answer · 2018-04-18 09:09:29Z

5

I find solution without modify my project:

mvn clean install
mvn exec:java -Dexec.mainClass=com.your.company.cli.Hello

answered Apr 18, 2018 at 9:09

Stéphane GRILLON

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Comments

Elarbi Mohamed Aymen · Accepted Answer · 2018-04-18 09:10:29Z

0

You can launch the jar file created with java -jar /target/myproject.jar.
You cannot use java -cp ... or javac because you need to put all java files in the same folder to be compiled.
For the error aucun attribut manifest principal dans myproject.jar is generated because java could not find main class i advise you to add this to your pom.xml file

`

<build>
  <plugins>
    <plugin>
      <!-- Build an executable JAR -->
      <groupId>org.apache.maven.plugins</groupId>
      <artifactId>maven-jar-plugin</artifactId>
      <version>3.0.2</version>
      <configuration>
        <archive>
          <manifest>
            <addClasspath>true</addClasspath>
            <classpathPrefix>lib/</classpathPrefix>
            <mainClass>com.mypackage.MyClass</mainClass>
          </manifest>
        </archive>
      </configuration>
    </plugin>
  </plugins>
</build>

and mention full name of your main class

[UPDATE]

In case you have multiple dependecies and you want to include all of them with your final jar you can use maven-assembly-plugin like this :

<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> <mainClass>${mainClass}</mainClass> </manifest> </archive> <descriptorRefs> <descriptorRef>jar-with-dependencies</descriptorRef> </descriptorRefs> </configuration> </execution> </executions> </plugin>

you must replace ${mainClass} with your main class full name

edited Apr 18, 2018 at 9:10

answered Apr 17, 2018 at 22:00

Elarbi Mohamed Aymen

1,7102 gold badges18 silver badges28 bronze badges

4 Comments

Stéphane GRILLON Over a year ago

if I have more one main class?

Elarbi Mohamed Aymen Over a year ago

how is this possible sir ? you must have only one main class, the entry point to your project/program

Stéphane GRILLON Over a year ago

Yes, i can have more one entries point (main actions, CLI action, admin action, ...)

Stéphane GRILLON Over a year ago

I add maven-jar-plugin but my jar do not contain any dependencies in lib/. So I have this error:

Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: com/github/foo/exception/TechnicalException

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