thuongnn/ga-java

Example containerized java spring boot project

Step 1. Generate java spring boot project

Click here to open generate page: https://start.spring.io

Step 2. Upate hello world code

Edit file in src/main/com/techmaster/helloworldexample

package com.techmaster.helloworldexample;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication
@RestController
public class HelloWorldExampleApplication {

	@RequestMapping("/")
    public String home() {
        return "Hello Docker World";
    }

	public static void main(String[] args) {
		SpringApplication.run(HelloWorldExampleApplication.class, args);
	}

}

Step 3. Build application

chmod +x ./mvnw
mvnw package

Step 4. Run application

java -jar target/hello-world-example-0.0.1-SNAPSHOT.jar

How Maven works?

These are the default life cycle phases in maven

• validate - validate the project is correct and all necessary information is available
• compile - compile the source code of the project
• test - test the compiled source code using a suitable unit testing framework. These tests should not require the code be packaged or deployed package - take the compiled code and package it in its distributable format, such as a JAR.
• verify - run any checks on results of integration tests to ensure quality criteria are met
• install - install the package into the local repository, for use as a dependency in other projects locally
• deploy - done in the build environment, copies the final package to the remote repository for sharing with other developers and projects.

Understand

order of execution

validate >> compile >> test (optional) >> package >> verify >> install >> deploy

So when you run the command mvn package, it runs the commands for all lifecycle phases till package

validate >> compile >> test (optional) >> package

And as for mvn install, it runs the commands for all lifecycle phases till install, which includes package as well

validate >> compile >> test (optional) >> package >> verify >> install