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Spring Boot made command apps more popular, so in this post we’re going to show how in Maven run Java app from command line.

Sample Java program

Let’s create a simple Spring Boot application that will serve our testing purposes.

Maven pom.xmlns

Place the following POM inside a directory: 

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="https://maven.apache.org/POM/4.0.0">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.farenda.tutorials</groupId>
    <artifactId>spring</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>1.4.1.RELEASE</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

Java code for Spring Boot app

Put the following code in src/main/java/com/farenda/tutorials/spring/App.java: 

package com.farenda.tutorials.spring;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {

    public static void main(String[] args) throws Exception {
        System.out.println("Hello, Maven!");
        SpringApplication.run(App.class, args);
    }
}

That’s it! Spring Boot requires nothing else to start!

Maven exec plugin

Now, let’s execute the above application using Maven exec plugin: 

mvn exec:java -Dexec.mainClass=com.farenda.tutorials.spring.App

When you run the above command, Maven will do processing and eventually run the app: 

//... cut for brevity
[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ spring ---
Hello, Maven!

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v1.4.1.RELEASE)

2016-11-06 18:21:35.920  INFO 22922 --- [ring.App.main()] com.farenda.tutorials.spring.App         : Starting App on namek with PID 22922 (/home/przemek/poligon/java/spring/springboothw/target/classes started by przemek in /home/przemek/poligon/java/spring/springboothw)
2016-11-06 18:21:35.952  INFO 22922 --- [ring.App.main()] com.farenda.tutorials.spring.App         : No active profile set, falling back to default profiles: default
...

References:

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