Slide deck for the talk "Building a Spring Boot Application - Ask the Audience!" at JVMCon 2018.

1. Building aBuilding a
Spring BootSpring Boot
ApplicationApplication
(ask the audience)(ask the audience)
Hanno Embregts @hannotify

2. Hanno?Hanno?Hanno?Hanno?Hanno?

3. IntroducingIntroducingIntroducingIntroducingIntroducing
Spring BootSpring BootSpring BootSpring BootSpring Boot

4. Spring Boot?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?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?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?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 OutStarting OutStarting OutStarting OutStarting Out

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

10. Java le(s)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 scriptBuild 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 DependenciesStarter 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
)
http://docs.spring.io/spring-
boot/docs/current/reference/htmlsingle/#using-boot-starter

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

14. Live codingLive codingLive codingLive codingLive coding

15. Kahoot! #1

16. Kahoot! #2

17. Implementing RepositoryImplementing Repository
MethodsMethods
De ne them in a @Query annotation
Use one of the many supported query methods
(
)
https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-
methods.query-creation
List<Entity> findByNameContainingIgnoreCase(String name);

18. Wrap-up &Wrap-up &Wrap-up &Wrap-up &Wrap-up &
QuestionsQuestionsQuestionsQuestionsQuestions

19. Wrap-upWrap-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.

20. And what if I prefer JavaEE?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

21. Any questions?Any questions?Any questions?Any questions?Any questions?

22. Thank you! ☺Thank you! ☺
Just can't get enough?
https://hannotify.github.io
@hannotify
hanno.embregts@infosupport.com