How Can I Run Java Main Methods with Maven?

Running Java Main Methods with Maven

Building and testing Java applications with Maven is a common task. Sometimes, it is necessary to execute the main method of a Java class for manual testing or debugging purposes. However, Maven does not provide a built-in phase or goal for this task.

To overcome this limitation, the exec Maven plugin can be used. It allows the execution of system commands, including running Java classes.

To run a Java class using the exec plugin, the following syntax can be used:

mvn exec:java -Dexec.mainClass="com.example.Main" [-Dexec.args="argument1"] ...

If the plugin is configured in the project's pom.xml, the invocation can be simplified to:

mvn exec:java

Below is an example of a pom.xml configuration for the exec plugin:

<project>
    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.mojo</groupId>
                <artifactId>exec-maven-plugin</artifactId>
                <version>3.2.0</version>
                <configuration>
                    <mainClass>com.example.Main</mainClass>
                    <arguments>
                        <argument>argument1</argument>
                    </arguments>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

By utilizing the exec Maven plugin in this manner, developers can easily run Java classes from within Maven, facilitating manual testing and debugging.

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