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Run Main Class of Maven Project

java
maven-plugin
java-execution
command-line-arguments
Nikita BarsukovbyNikita Barsukov·Aug 27, 2024
TLDR

Kickstart your Maven project by executing the main class:

mvn exec:java -Dexec.mainClass="com.example.Main"

Don't forget to replace com.example.Main with your class's full path to get your project up and running.

Got arguments to pass? No problem!

mvn exec:java -Dexec.mainClass="com.example.Main" -Dexec.args="firstArg secondArg thirdArg"

Just change firstArg secondArg thirdArg with your actual arguments.

Leveraging Maven-exec-plugin

The maven-exec-plugin, a handy tool for executing Java applications, can be tailor-fitted in your pom.xml or dispatched directly from the CLI like a skilled commando.

Profile Activation

Power up specific Maven profiles or bypass prompts with the -P option. Like a secret handshake, it helps you gain exclusive access to your Main class.

The Power of mvnexec

Finding the Main class in a deeply nested project structure is like finding a needle in a haystack. The mvnexec script automatically locates classes with Main methods – it's like a compass directing you through your labyrinth-like project.

Faster Execution with -B

Shave off compilation time when not required with the -B option or --batch-mode flag. It's like hitting the turbo boost on your project execution!

Flexible Class Filtering

mvnexec not only locates our Main classes, but also allows you to filter based on scope (test/main) or name. Perfect for when you're dealing with larger projects and need a bit more control.

Insightful Execution Details

Pom.xml - Your Stage Setter

Adding the maven-exec-plugin in your pom.xml provides a stable environment for class execution. Especially handy when working with a team or on a CI/CD pipeline.

Passing the Baton - Arguments

mvn exec:java can pass arguments to your main method similar to a relay race. Use -Dexec.args to ensure a smooth transition of your arguments.

Working with Multiple Main Methods

In case your project has multiple main methods, consider using naming conventions or Maven profiles to clearly select the appropriate class. This will help to avoid the "Oops! Wrong door" scenario.