This document provides an overview of building applications with Spring Boot. It discusses key features such as creating stand-alone Spring applications without separate web servers, automatic Spring configuration, and getting started quickly with one Java file and a build script. Pros include faster deployments and no need for web.xml files. Cons can include custom configuration challenges and incompatibility with some legacy Spring projects. The document also demonstrates sample code and references Spring Initializr for project setups.

1. Building a
Spring Boot
Application
(ask the audience)
Hanno Embregts @hannotify

2. Hanno?

3. Introducing
Spring Boot

4. Spring Boot?
( )
"Takes an opinionated view of building
production-ready Spring applications.
Favors convention over con guration and
is designed to get you up and running as
quickly as possible."
https://projects.spring.io/spring-boot

5. Key features?
create stand-alone Spring applications
embed web server directly (no WAR les)
automatic Spring con guration wherever
possible
no code generation and no XML con guration
still offering all Spring features.

6. Pros?
no separate web server needed
better debugging in IDEs
faster deployments (about 50%)
no web.xml or con guration classes needed
up and running with one Java le and a build
script.
( )https://www.ethode.com/blog/6-simple-reasons-why-spring-boot-rocks

7. Cons?
custom con guration will be a bit of a puzzle
porting your legacy Spring project would be a
disaster!
it uses Spring, excluding roughly half of the Java
community.

8. Starting Out

9. About What We Claimed
Earlier...
"up and running with one Java le and a
build script"

10. Java le(s)
// imports...
@RestController
public class HelloController {
@RequestMapping("/")
public String index() {
return "Greetings from Spring Boot!";
}
}
// imports...
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

11. Build script
apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'org.springframework.boot'
jar {
// some properties...
}
// repositories...
dependencies {
compile("org.springframework.boot:spring-boot-starter-web")
testCompile("junit:junit")
}

12. Starter Dependencies
a set of convenient dependency descriptors
follow the naming pattern spring-boot-starter-
*
Name Purpose
spring-boot-starter Core starter, includes auto-con g & logging
spring-boot-starter-test Test starter, includes JUnit, Hamcrest & Mockito
spring-boot-starter-web Starter for Spring MVC Web applications
spring-boot-starter-data-jpa Spring Data with JPA
(more starters at
)
https://docs.spring.io/spring-
boot/docs/current/reference/htmlsingle/#using-boot-starter

13. Spring Initializr
(a quick way to download a project setup)
http://start.spring.io/

14. Live coding

15. Kahoot! #1

16. Kahoot! #2

17. Wrap-up &
Questions

18. Wrap-up
Spring Boot
gets you up & running quickly;
assumes standard con guration for rapid
development;
plays nice with a wide range of frameworks;
is up to the task no matter what choices you make.

19. And what if I prefer JavaEE?
At least you can use embedded servers:
TomEE Embedded
( )
Wild y Swarm
( )
Quick assembly with JBoss ShrinkWrap
(
)
http://tomee.apache.org/advanced/tomee-embedded/index.html
http://wild y-swarm.io/
http://www.lordofthejars.com/2014/09/apache-tomee-shrinkwrap-javaee-boot-
not.html

20. Any questions?

21. Thank you! ☺
You can contact me at:
@hannotify
hanno.embregts@infosupport.com