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 ...
