Spring boot
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Spring boot is a great and relatively a new project from Spring.io. The presentation discusses about basics of spring boot to advance topics. Sample demo apps are available here : https://github.com/bhagwat/spring-boot-samples
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Spring boot
- 1. Spring Boot By Bhagwat Kumar
- 2. Agenda ⢠What and Why? ⢠Key features of Spring boot ⢠Prototyping using CLI. ⢠Gradle primer ⢠Managing profiles aka environment in grails ⢠Using Spring data libraries e.g. MongoDB ⢠Using GORM ⢠Presentation layer ⢠Using GSP 2
- 3. What and why? ⢠Its not a replacement for Spring framework but it presents a small surface area for users to approach and extract value from the rest of Spring. ⢠Spring-Ââboot provides a quick way to create a Spring based application from dependency management to convention over configuration. ⢠Grails 3.0 will be based on Spring Boot. image source : http://spring.io/blog/2013/08/06/spring-Ââboot-Ââsimplifying-Ââspring-Ââfor-Ââeveryone 3
- 4. Key Features ⢠Stand-Ââalone Spring applications ⢠No code generation/ No XML Config ⢠Automatic configuration by creating sensible defaults ⢠Starter dependencies ⢠Structure your code as you like ⢠Supports Gradle and Maven ⢠Common non-Ââfunctional requirements for a "real" application â embedded servers, â security, metrics, health checks â externalised configuration
- 5. Rapid Prototyping : Spring CLI ⢠Quickest way to get a spring app off the ground ⢠Allows you to run groovy scripts without much boilerplate code ⢠Not recommended for production Install using GVM $ gvm install springboot Running groovy scripts $ spring run app.groovy $ spring run --watch app.groovy $ spring test tests.groovy
- 6. A quick web application using spring boot app.groovy @Controller class Example { @RequestMapping("/") @ResponseBody public String helloWorld() { "Hello Spring boot audience!!!" } } $ spring run app.groovy
- 7. What Just happened? // import org.springframework.web.bind.annotation.Controller // other imports ... // @Grab("org.springframework.boot:spring-Ââboot-Ââweb-Ââstarter:0.5.0") // @EnableAutoConfiguration @Controller class Example { @RequestMapping("/") @ResponseBody public String hello() { return "Hello World!"; } // public static void main(String[] args) { // SpringApplication.run(Example.class, args); // } }
- 8. Starter POMs ⢠One-Ââstop-Ââshop for all the Spring and related technology ⢠A set of convenient dependency descriptors ⢠Contain a lot of the dependencies that you need to get a project up and running quickly ⢠All starters follow a similar naming pattern; â spring-Ââboot-Ââstarter-Ââ* ⢠Examples â spring-Ââboot-Ââstarter-Ââweb â spring-Ââboot-Ââstarter-Ââdata-Âârest â spring-Ââboot-Ââstarter-Ââsecurity â spring-Ââboot-Ââstarter-Ââamqp â spring-Ââboot-Ââstarter-Ââdata-Ââjpa â spring-Ââboot-Ââstarter-Ââdata-Ââelasticsearch â spring-Ââboot-Ââstarter-Ââdata-Ââmongodb â spring-Ââboot-Ââstarter-Ââactuator
- 9. Demo : Starter POMs @Grab('spring-Ââboot-Ââstarter-Ââsecurity') @Grab('spring-Ââboot-Ââstarter-Ââactuator') @Controller class Example { @RequestMapping("/") @ResponseBody public String helloWorld() { return "Hello Audience!!!" } } //security.user.name : default 'user' //security.user.password : see log for auto generated password //actuator endpoints: /beans, /health, /mappings, /metrics etc.
- 10. Building using Gradle 10
- 11. Lets go beyond prototyping : Gradle Image source : http://www.drdobbs.com/jvm/why-Ââbuild-Ââyour-Ââjava-Ââprojects-Ââwith-Ââgradle/240168608
- 12. build.gradle task hello << { println "Hello !!!!" } task greet <<{ println "Welocome Mr. Kumar" } task intro(dependsOn: hello) << { println "I'm Gradle" } hello << { println "Hello extended!!!!" } greet.dependsOn hello, intro // gradle tasks :list all the available tasks // gradle intro :executes intro task // gradle -Ââq greet :bare build output // gradle -Ââ-Ââdaemon hello :subsequent execution will be fast
- 13. build.gradle : using plugin and adding dependencies apply plugin: "groovy" //look for sources in src/main/groovy folder //inherits java plugin: src/main/java folder // tasks compileJava, compileGroovy, build, clean sourceCompatibility = 1.6 repositories { mavenCentral() } dependencies { compile 'org.codehaus.groovy:groovy-Ââall:2.3.6' compile "org.apache.commons:commons-Ââlang3:3.0.1" testCompile "junit:unit:4.+" }
- 14. build.gradle: for Spring boot app with hot reloading apply plugin: 'groovy' apply plugin: 'idea' apply plugin: 'spring-Ââboot' buildscript { repositories { mavenCentral()} dependencies { classpath("org.springframework.boot:spring-Ââboot-Ââgradle-Ââplugin:1.1.8.RELEASE") classpath 'org.springframework:springloaded:1.2.0.RELEASE' } } idea { module { inheritOutputDirs = false outputDir = file("$buildDir/classes/main/") } } repositories { mavenCentral() } dependencies { compile 'org.codehaus.groovy:groovy-Ââall' compile 'org.springframework.boot:spring-Ââboot-Ââstarter-Ââweb' }
- 15. Environment and Profile aka Grails config ⢠Put application.properties/application.yml somewhere in classpath ⢠Easy one: src/main/resources folder 15 application.yml app: name: Springboot+Config+Yml+Demo version: 1.0.0 server: port: 8080 settings: counter: 1 -Ââ-Ââ-Ââ spring: profiles: development server: port: 9001 application.properties app.name=Springboot+Config+Demo app.version=1.0.0 server.port=8080 settings.coutner=1 application-Ââdevelopment.properties app.name=Springboot+Config+Demo app.version=1.0.0 server.port=8080
- 16. Binding properties 16 Using ConfigurationProperties annotation import org.springframework.boot.context.properties.ConfigurationProperties import org.springframework.stereotype.Component @Component @ConfigurationProperties(prefix = "app") class AppInfo { String name String version } Using Value annotation import org.springframework.beans.factory.annotation.Value import org.springframework.stereotype.Component @Component class AppConfig { @Value('${app.name}') String appName @Value('${server.port}') Integer port }
- 17. Examples 17 OS env variable export SPRING_PROFILES_ACTIVE=development export SERVER_PORT=8090 gradle bootRun java -Ââjar build/libs/demo-Ââ1.0.0.jar with a -ÂâD argument (remember to put it before the main class or jar archive) java -Ââjar -ÂâDspring.profiles.active=development build/libs/dem-Ââ1.0.0.jar java -Ââjar -ÂâDserver.port=8090 build./libs/demo-Ââ1.0.0.jar
- 18. Using Spring data ⢠Add dependency compile 'org.springframework.boot:spring-Ââboot-Ââstarter-Ââdata-Ââmongodb' ⢠Configure database URL spring.data.mongodb.uri=mongodb://localhost/springtestdev ⢠Add entity class import org.springframework.data.annotation.Id; class ⢠Add Person{@Id String id, String name} repository interface import org.springframework.data.mongodb.repository.MongoRepository public interface PersonRepository extends ⢠Autowire and use like charm MongoRepository<Person, String> {} @Autowired PersonRepository personRepository personRepository.save(new Person(name:'Spring Boot')) personRepository.findAll() personRepository.count()
- 19. Next level persistence with GORM ⢠Add dependencies to use GORM-ÂâHibernate ⢠For GORM MongoDB use the following dependencies compile 'org.grails:gorm-Ââmongodb-Ââspring-Ââboot:1.1.0.RELEASE' ⢠Add entity with @grails.persistence.entity 19 compile 'org.springframework.boot:spring-Ââboot-Ââstarter-Ââdata-Ââjpa' compile 'org.grails:gorm-Ââhibernate4-Ââspring-Ââboot:1.1.0.RELEASE' runtime 'com.h2database:h2' //for h2 database import grails.persistence.Entity @Entity class Person { String name; Integer age static constraints = { name blank: false age min: 15 } } Further reading https://github.com/grails/grails-Ââdata-Ââmapping
- 20. Server side view template libraries ⢠JSP/JSTL ⢠Thymeleaf ⢠Freemarker ⢠Velocity ⢠Tiles ⢠GSP ⢠Groovy Template Engine 20
- 21. ⢠Very limited existing tags available ⢠https://github.com/grails/grails-Ââboot/issues/3 ⢠Add dependency ⢠Put GSP templates in resources/templates folder GSP 21 compile "org.grails:grails-Ââgsp-Ââspring-Ââboot:1.0.0.RC1" compile "org.grails:grails-Ââweb:2.4.0.M2"
- 22. GSP continued... ⢠Sample request handler 22 @RequestMapping("/show/{id}") public ModelAndView show(@PathVariable Long id) { Person person = Person.read(id) if (person) { //render(view:"/person/show", model:[personInstance:personInstance]) new ModelAndView("/person/show", [personInstance: Person.get(id)]) } else { log.info "No entity fount for id : " + id //redirect(controller:"person", action:"list") new ModelAndView("redirect:/person/list") } }
- 23. Grails Taglib 23 @grails.gsp.TagLib @org.springframework.stereotype.Component class ApplicationTagLib { static namespace = "app" def paginate = { attrs -Ââ> String action = attrs.action Integer total = attrs.total Integer currentPage = attrs.currentPage ?: 1 Integer pages = (total / 10) + 1 out << render(template: "/shared/pagination", model: [action: action, total: total, currentPage: currentPage, pages: pages] ) } } <app:paginate total="${personInstanceCount ?: 0}" currentPage="${currentPage}" action="/person/list"/>
- 24. Packaging executable jar and war files 24 Packaging as jar with embedded tomcat $ gradle build $ java -Ââjar build/libs/mymodule-Ââ0.0.1-ÂâSNAPSHOT.jar Packaging as war : configure build.groovy //... apply plugin: 'war' war { baseName = 'myapp' version = '0.5.0' } //.... configurations { providedRuntime } dependencies { compile("org.springframework.boot:spring-Ââboot-Ââstarter-Ââweb") providedRuntime("org.springframework.boot:spring-Ââboot-Ââstarter-Ââtomcat") // ... } $ gradle war
- 25. Q/A 25
- 26. Thank you. 26 Blog: http://www.intelligrape.com/blog/author/bhagwat LikedIn: http://www.linkedin.com/in/bhagwatkumar Twitter: http://twitter.com/bhagwatkumar Mail : bhagwat@intelligrape.com
- 27. References Samples : https://github.com/bhagwat/spring-Ââboot-Ââsamples http://docs.spring.io/spring-Ââboot/docs/current-ÂâSNAPSHOT/reference/htmlsingle http://docs.spring.io/spring-Ââboot/docs/current-ÂâSNAPSHOT/reference/htmlsingle/#getting-Ââ started-Ââgvm-Ââcli-Ââinstallation https://github.com/spring-Ââprojects/spring-Ââboot/tree/master/spring-Ââboot-Ââcli/samples http://docs.spring.io/spring-Ââboot/docs/current-ÂâSNAPSHOT/reference/htmlsingle/#using-Ââboot-Ââ starter-Ââpoms http://spring.io/guides/gs/accessing-Ââmongodb-Ââdata-Âârest/ https://spring.io/guides/gs/accessing-Ââdata-Ââmongodb/ https://spring.io/guides/gs/accessing-Ââdata-Ââjpa/ http://www.gradle.org/ http://www.slideshare.net/Soddino/developing-Ââan-Ââapplication-Ââwith-Ââspring-Ââboot-Ââ34661781 http://presos.dsyer.com/decks/spring-Ââboot-Ââintro.html http://pygments.org/ for nicely formatting code snippets included in presentation 27