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readme.md

First 10 Steps in Spring Boot

  • Step 1 : Introduction to Spring Boot - Goals and Important Features
  • Step 2 : Developing Spring Applications before Spring Boot
  • Step 3 : Using Spring Initializr to create a Spring Boot Application
  • Step 4 : Creating a Simple REST Controller
  • Step 5 : What is Spring Boot Auto Configuration?
  • Step 6 : Spring Boot vs Spring vs Spring MVC
  • Step 7 : Spring Boot Starter Projects - Starter Web and Starter JPA
  • Step 8 : Overview of different Spring Boot Starter Projects
  • Step 9 : Spring Boot Actuator
  • Step 10 : Spring Boot Developer Tools
  • Spring Boot - Conclusion

Complete Code Example

/notes.txt

Goals
Enable building production ready applications quickly
Provide common non-functional features 
- embedded servers
- metrics
- health checks
- externalized configuration

What Spring Boot is NOT!
ZERO code generation
Neither an application server nor a web server

Features
Quick Starter Projects with Auto Configuration
 - Web
 - JPA
Embedded Servers - Tomcat, Jetty or Undertow
Production-ready features
 - metrics and health checks 
 - externalized configuration
 
 
http:https://localhost:8080/books => Few hardcoded books

/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http:https://maven.apache.org/POM/4.0.0" xmlns:xsi="http:https://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http:https://maven.apache.org/POM/4.0.0 http:https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.in28minutes.springboot.basics</groupId>
	<artifactId>springboot-in-10-steps</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springboot-in-10-steps</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

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

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.data</groupId>
			<artifactId>spring-data-rest-hal-browser</artifactId>
		</dependency>

<!-- 
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		 -->
		
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>

	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>


</project>

/src/main/java/com/in28minutes/springboot/basics/springbootin10steps/Book.java

package com.in28minutes.springboot.basics.springbootin10steps;

public class Book {
	long id;
	String name;
	String author;

	public Book(long id, String name, String author) {
		super();
		this.id = id;
		this.name = name;
		this.author = author;
	}

	public long getId() {
		return id;
	}

	public String getName() {
		return name;
	}

	public String getAuthor() {
		return author;
	}

	@Override
	public String toString() {
		return String.format("Book [id=%s, name=%s, author=%s]", id, name, author);
	}

}

/src/main/java/com/in28minutes/springboot/basics/springbootin10steps/BooksController.java

package com.in28minutes.springboot.basics.springbootin10steps;

import java.util.Arrays;
import java.util.List;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class BooksController {
	@GetMapping("/books")
	public List<Book> getAllBooks() {
		return Arrays.asList(
				new Book(1l, "Mastering Spring 5.2", "Ranga Karanam"));
	}
}

/src/main/java/com/in28minutes/springboot/basics/springbootin10steps/SpringbootIn10StepsApplication.java

package com.in28minutes.springboot.basics.springbootin10steps;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ConfigurableApplicationContext;

@SpringBootApplication
public class SpringbootIn10StepsApplication {

	public static void main(String[] args) {
		ApplicationContext applicationContext = 
				SpringApplication.run(SpringbootIn10StepsApplication.class, args);
		
		for (String name : applicationContext.getBeanDefinitionNames()) {
			System.out.println(name);
		}
	}
}

/src/main/resources/application.properties

#logging.level.org.springframework = DEBUG
management.endpoints.web.exposure.include=*

/src/test/java/com/in28minutes/springboot/basics/springbootin10steps/SpringbootIn10StepsApplicationTests.java

package com.in28minutes.springboot.basics.springbootin10steps;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;

@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootIn10StepsApplicationTests {

	@Test
	public void contextLoads() {
	}

}