To package a Maven project into a single JAR file, you can use the "maven-jar-plugin" in your project's pom.xml file. The plugin's "jar" goal creates a JAR file with the compiled classes and resources of the project.
Here is an example of how to configure the maven-jar-plugin in your pom.xml file:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
This will package the project into a JAR file with the default settings, which includes all the compiled classes and resources in the project's "target/classes" directory.
You can also specify the finalName of the JAR and its location by adding the following configuration:
<configuration>
<finalName>${project.artifactId}-${project.version}</finalName>
<outputDirectory>${project.build.directory}</outputDirectory>
</configuration>
You can also include dependencies of the project by adding the following configuration:
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>com.example.Main</mainClass>
</manifest>
</archive>
</configuration>
This will create a JAR file in the "target" directory of your project with the name specified in finalName.
It is important to note that the Main class should be specified in the fully-qualified format, that is package name and class name should be specified. Also, you should make sure that Java is installed and the JAVA_HOME environment variable is set properly on your system for this to work.
To run a Maven project with its dependencies, you can use the "maven-shade-plugin" to package the dependencies into a single JAR file. The shade plugin allows you to create a "fat" JAR file, which includes all the dependencies of the project.
Here is an example of how to configure the maven-shade-plugin in your pom.xml file:
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>3.2.4</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
This will package the project and its dependencies into a single JAR file named projectName-version-shaded.jar in the "target" directory of your project.
You can also specify the finalName of the JAR and its location by adding the following configuration:
<configuration>
<finalName>${project.artifactId}-${project.version}-shaded</finalName>
<outputDirectory>${project.build.directory}</outputDirectory>
</configuration>
Once you've added the plugin configuration to your pom.xml file, you can create the shaded JAR by running the following command:
mvn package
To run this JAR you can use the following command:
java -jar target/<finalName>.jar