Spring Boot allows the creation of Spring Framework based applications in a quick and easy way without any XML configuration. It does not generate code, but provides useful defaults and an opinionated approach to the configuration but it quickly gets out of the way when we want to change and override the configuration. As if this wasn't enough we can also create production-ready applications with features such as metrics, health checks and externalized configuration. If you add Groovy you have the perfect combination to speed up your development and have fun while developing. In this talk you will see introductory examples of Spring Boot, the creation of a small RESTful API, the usage of Websockets, some of the Spring Boot CLI goodness... and many more examples!

1. Spring Boot and Groovy.
What more do you need?
Iván López - @ilopmar

2. Hello!
I am Iván López
@ilopmar
http://greachconf.com@madridgug

3. What is
Spring Boot?

4. Spring Boot
▷ Fast bootstrap for Spring applications
▷ Opinionated framework (convention over
configuration)
▷ Total integration with Spring ecosystem

5. Why is different?
▷ Non-functional requirements
▷ No XML/Code generation
▷ Groovy!
▷ Stand-alone applications
▷ Micro-services

7. What do I need to install it?
▷ Java 6+
▷ GVM: http://gvmtool.net
▷ Download it

8. Spring Boot CLI

9. 1.
Demo
Spring Boot CLI

10. What happened?
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
@Grab('org.springframework.boot:spring-boot-starter-web:1.2.3.RELEASE')
@EnableAutoConfiguration
@RestController
class ThisWillActuallyRun {
@RequestMapping("/")
String home() {
'Hello GR8Conf!'
}
static void main(String[] args) {
SpringApplication.run ThisWillActuallyRun, args
}
}

11. What happened?
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
@Grab('org.springframework.boot:spring-boot-starter-web')
@EnableAutoConfiguration
@RestController
class ThisWillActuallyRun {
@RequestMapping("/")
String home() {
'Hello GR8Conf!'
}
static void main(String[] args) {
SpringApplication.run ThisWillActuallyRun, args
}
}

12. @EnableAutoConfiguration
▷ Tries to configure automatically the app
▷ Use the .jars on our classpath
▷ It goes away when we define our beans

13. Starters
▷ Standard POMs
▷ Recommended dependencies
▷ Transitive dependencies management

14. Starters
actuator
amqp
aop
batch
data-elasticsearch
data-mongodb
groovy-templates
integration
jdbc
redis
remote-shell
security
websockets
...

15. Alright. How do I start?
▷ http://start.spring.io
▷ Maven/Gradle
▷ Java/Groovy
▷ JDK version (6, 7 & 8)
▷ Starters

17. Project structure
$ tree
.
├── build.gradle
└── src
├── main
│ ├── groovy
│ │ └── eu
│ │ └── gr8conf
│ │ └── DemoApplication.groovy
│ └── resources
│ ├── application.properties
│ ├── static
│ └── templates
└── test
└── groovy
└── eu
└── gr8conf
└── DemoApplicationTests.groovy

18. spring-boot-starter-actuator
▷ Non-functional requirements
▷ Metrics
▷ Health-checks

19. Ready for production
▷ Spring boot CLI
spring jar my-app.jar app.groovy
java -jar my-app.jar
▷ Gradle
./gradlew build
java -jar build/libs/my-app-0.0.1.jar

20. “Make jar not war
- Josh Long
(@starbuxman)

21. Configuration
▷ application.properties / application.yml
▷ Override properties
java -jar app.jar --server.port=8181
▷ @ConfigurationProperties

22. Logging
▷ Logback by default
▷ Groovy configuration: logback.groovy
▷ @groovy.util.logging.Slf4j

23. 2.
Demo

25. What about Grails?
▷ Grails 3 built on top of Spring Boot
▷ Hybrid projects

26. And the bad things?
▷ It's Spring (for good and for bad)
▷ Annotation Driven Development
▷ Documentation

27. 3.
Summary

28. Let’s review some concepts
Fast bootstrap
Spring applications
Future of Spring
Framework
Micro-services
Gaining a lot of
traction
Gradle integration Groovy

29. Thanks!
Any questions?
@ilopmar
lopez.ivan@gmail.com
https://github.com/lmivan
Iván López
http://kcy.me/23j7w