Customize Spring Boot's auto configurations

In this tutorial, we will customize the spring boot's auto configurations. This can be done in following ways:

• Through program arguments
• application.properties
• application.yml
YAML is a serialization format that follows the hierarchical structure, which is in ways similar to JSON. It will contain key value pairs in a hierarchical format. And it is really popular in ruby. Spring dependencies have snake yaml jar which is responsible for parsing yaml.

Spring boot gives developers choices, often there are multiple methods to achieve the same thing in spring boot. This allows developers to pick their favorite approach.

Find this project on Github

https://github.com/javacodenet/springBootApplicationPropertiesDemo

pom.xml

	<?xml version="1.0" encoding="UTF-8"?>
	<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.javacodenet</groupId>
	<artifactId>spring-boot</artifactId>
	<version>1.0-SNAPSHOT</version>
	<parent>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-parent</artifactId>
	<version>1.4.0.RELEASE</version>
	</parent>
	<dependencies>
	<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-web</artifactId>
	</dependency>
	</dependencies>
	<build>
	<plugins>
	<plugin>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-maven-plugin</artifactId>
	</plugin>
	</plugins>
	</build>
	</project>

view raw pom.xml hosted with ❤ by GitHub

Application.java

	package com.javacodenet;
	import org.springframework.boot.SpringApplication;
	import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
	import org.springframework.web.bind.annotation.RequestMapping;
	import org.springframework.web.bind.annotation.RestController;
	@RestController
	@EnableAutoConfiguration
	public class Application {
	@RequestMapping("/")
	public String homePage(){
	return "Welcome to home page";
	}
	public static void main(String[] args) {
	SpringApplication.run(Application.class, args);
	}
	}

view raw Application.java hosted with ❤ by GitHub

Through program arguments

application.properties

	server.port=8585
	server.context-path=/hello
	page: home page
	title: Welcome to ${page}

view raw application.properties hosted with ❤ by GitHub

application.yml

	server:
	port: 8585
	context-path: /hello
	page: home page
	title: Welcome to ${page}

view raw application.yml hosted with ❤ by GitHub

Output