JVM Web Frameworks Exploration

JVM Web Frameworks Exploration covering Grails, Spring Boot and Ratpack.

Transcript

1. JVM Web Frameworks Exploration Edition by Kevin Tan
2. #intro #shamelessplug 5 years of working experience #freelance #android #groovy #grailsfw #springboot #gaelyk
3. Common Patterns in Web Frameworks 1. Able to go micro (microservices) or full blown 2. Layout templating (simplicity of front end coding) 3. Able to initialize and bootstrap data in development mode 4. Code generation to hasten the development process and reduce the margin of error 5. Non-cryptic error messages 6. Supports auto-reloading to some extent 7. Ease of deployment 8. RESTful (architectural style)
4. 3 JVM Web Frameworks to Learn in 2015/6
5. BUT FIRST! Install SDK Manager from Sdkman.io
6. How SDKMAN Works
7. Grails Convention over configuration, sensible defaults, opinionated APIs
8. Grails 3 Domain as REST Resource Multi database support in GORM - Postgresql, MySql, MongoDB, etc Profiles (as of Grails 3.x) - web-api, web-micro, etc Plugin ecosystem - optional components such as Spring Security Core Spock testing framework integrated GSP Layout Templating
9. Grails 3 @Resource(uri=’/user’, readOnly = false, formats=[‘json’, ‘xml’]) @ToString class User { String name String email }
10. Grails 3 grails run-app
11. DEMO grails create-app <projectname>
12. Spring Boot Opinionated view on building production ready and lightweight Spring applications
13. Spring Boot Production ready features - metrics, health checks, app configs, etc. Can be coded in Java or Groovy, depends on your liking full blown / micro web deploys as WAR, JAR or even Groovy script Any layout templating language you choose such as Thymeleaf, GSP or Groovy template engine
14. Spring Boot Demo Start project using http://start.spring.io For more concrete examples: https://github.com/spring-projects/spring-boot/tree/master/spring-boot- samples
15. Spring Boot Demo Use the command line: spring init --list (to list down the spring components you can initialize with a new project) then: spring init --java=1.8 --dependencies=websocket,data-jpa --packaging=war <ProjectName> https://docs.spring.io/spring-boot/docs/current/reference/html/cli-using-the-cli. html
16. Ratpack Lightweight, async non-blocking, unopinionated
17. Ratpack Flexible Metrics integration Circuit breaker for fault tolerance Dependency injection In-built modules such as sessions, auth, etc Groovy template engine as default layout templating
18. Ratpack Demo lazybones create ratpack <project name> For more concrete examples: https://github.com/ratpack/example-books
19. BEST of ALL THREE Deployable by just using ONE groovy script Grape Dependency Engine in Groovy (with @Grapes and @Grab ) Netty server / Embedded Tomcat container
20. Groovy Script Example : Grails grails create-app <appname> --profile=web-micro
21. Groovy Script Example : Spring Boot @RestController class TestSpringMicro { @RequestMapping("/") String home() { "Hello World!" } }
22. Groovy Script Example : Spring Boot https://gist.github.com/kevintanhongann/a02016ebf0bea464ec0f To run, use command ‘spring run <filename>.groovy’
23. Groovy Script Example : Ratpack groovy ratpack.groovy for this script written below (You can tweet this!) : @Grab(‘io.ratpack:ratpack-groovy:1.0.0’) import static ratpack.groovy.Groovy.ratpack ratpack { handlers{ render “Hello world!” } }
24. Groovy script based Microservices? When to use it?? Prototyping Hackathons Production use (code and deploy while production is running) #not100percentsure #perhapsnotsopractical #whoknows
25. References Spring Boot - http://projects.spring.io/spring-boot/ Grails - http://www.grails.org/ Ratpack - https://ratpack.io/ Groovy programming language - http://www.groovy-lang.org/