Grails Spring Boot

AGENDA
1. What and why?
2. Key features ofSpring boot
3. Prototyping usingCLI
4. Gradle primer
5. Managing profiles aka environment in grails
6. Using Spring data libraries e.g. MongoDB
7. UsingGORM
8. Presentation layer
9. UsingGSP

• Its not a replacement for Spring framework but it presents a small
surface area for usersto approach and extract value from the rest of
Spring
• Spring-boot provides a quick way to create a Spring based
application from dependency management to convention over
configuration
• Grails 3.0will be based on Spring Boot
WHAT & WHY?

• Stand-alone Springapplications
• No code generation/ No XML Config
• Automatic configuration by creating sensible defaults
• Starterdependencies
• Structure your code as you like
• Supports Gradle andMaven
• Common non-functional requirements for a "real" application
- embedded servers,
- security, metrics, healthchecks
- externalized configuration
KEY FEATURES

• Quickest way to get a spring app off the ground
• Allows you to run groovy scripts without much boilerplate code
• Not recommended forproduction
RAPID PROTOTYPING : SPRING CLI

@Controller
classExample{
@RequestMapping("/")
@ResponseBody
public StringhelloWorld(){
"Hello Spring bootaudience!!!"
}
}
GETTING STARTED REALLY QUICKLY

// importorg.springframework.web.bind.annotation.Controller
// otherimports...
//@Grab("org.springframework.boot:spring-boot-web-starter:0.5.0")
//@EnableAutoConfiguration
@Controller
classExample{
@RequestMapping("/")
@ResponseBody
publicStringhello(){
return"HelloWorld!";
}
// public static void main(String[]args){
// SpringApplication.run(Example.class,args);
// }
}
WHAT JUST HAPPENED?

• One-stop-shop 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 runningquickly
• All starters follow a similarnaming pattern;
• spring-boot-starter-*
• Examples
-spring-boot-starter-web
- spring-boot-starter-data-rest
- spring-boot-starter-security
- spring-boot-starter-amqp
- spring-boot-starter-data-jpa
- spring-boot-starter-data-elasticsearch
- spring-boot-starter-data-mongodb
- spring-boot-starter-actuator
STARTER POMs

LETS GO BEYOND PROTOTYPING : GRADLE

task hello <<{
println "Hello!!!!"
}
task greet<<{
println "Welocome Mr.Kumar"
}
task intro(dependsOn: hello)<<{
println "I'mGradle"
}
hello <<{println "Hello extended!!!!" }
greet.dependsOn hello,intro
// gradletasks
// gradleintro
:listall the available tasks
:executes introtask
// gradle -q greet :bare build output
// gradle --daemon hello:subsequent execution wil be fast
BUILD.GRADLE

apply plugin:"groovy"
//look for sources in src/main/groovyfolder
//inherits java plugin: src/main/javafolder
// tasks compileJava, compileGroovy, build, clean
sourceCompatibility =1.6
repositories {
mavenCentral()
}
dependencies {
compile 'org.codehaus.groovy:groovy-all:2.3.6'
compile "org.apache.commons:commons-lang3:3.0.1"
testCompile "junit:unit:4.+"
}
BUILD.GRADLE: USING PLUGIN AND
ADDING DEPENDENCIES

apply plugin:'groovy'
apply plugin:'idea'
apply plugin:'spring-boot'
buildscript{
repositories {mavenCentral()}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin: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-all'
compile 'org.springframework.boot:spring-boot-starter-web'
}
BUILD.GRADLE: FOR SPRING BOOT APP
WITH HOT RELOADING

• Put application.properties/application.yml somewhere in classpath
• Easy one: src/main/resourcesfolder
ENVIRONMENT AND PROFILE AKA GRAILS
CONFIG

Using ConfigurationProperties annotation
import org.springframework.boot.context.properties.ConfigurationProperties
importorg.springframework.stereotype.Component
@Component
@ConfigurationProperties(prefix="app")
class AppInfo {
String name
Stringversion
}
Using Valueannotation
importorg.springframework.beans.factory.annotation.Value
importorg.springframework.stereotype.Component
@Component
classAppConfig{
@Value('${app.name}')
StringappName
@Value('${server.port}')
Integerport
}
BINDING PROPERTIES

OS envvariable
export SPRING_PROFILES_ACTIVE=development
export SERVER_PORT=8090
gradle bootRun
java -jarbuild/libs/demo-1.0.0.jar
with a -D argument (remember to put it before the main class or jararchive)
java -jar -Dspring.profiles.active=development build/libs/dem-1.0.0.jar
java -jar -Dserver.port=8090build./libs/demo-1.0.0.jar
EXAMPLES

• Add dependency
compile 'org.springframework.boot:spring-boot-starter-data-mongodb'
• Configure database URL
spring.data.mongodb.uri=mongodb://localhost/springtestdev
• Add entityclass
importorg.springframework.data.annotation.Id;
classPerson{@IdStringid, Stringname}
• Add repositoryinterface
importorg.springframework.data.mongodb.repository.MongoRepository
public interface PersonRepositoryextendsMongoRepository<Person, String> {}
• Autowire and use like charm
@AutowiredPersonRepository personRepository
personRepository.save(new Person(name:'SpringBoot'))
personRepository.findAll()
personRepository.count()
USING SPRING DATA

• Add dependencies to use GORM-Hibernate
compile 'org.springframework.boot:spring-boot-starter-data-jpa'
compile 'org.grails:gorm-hibernate4-spring-boot:1.1.0.RELEASE'
runtime 'com.h2database:h2' //for h2database
• Add entity with@grails.persistence.entity
importgrails.persistence.Entity
@Entity
class Person{
Stringname;
Integerage
static constraints ={
name blank:false
age min:15
}
}
• For GORM MongoDB use the following dependencies
compile 'org.grails:gorm-mongodb-spring-boot:1.1.0.RELEASE'
NEXT LEVEL PERSISTENCE WITH GORM

• JSP/JSTL
• Thymeleaf
• Freemarker
• Velocity
• Tiles
• GSP
• Groovy TemplateEngine
SERVER SIDE VIEW TEMPLATE LIBRARIES

• Very limited existing tags available
https://github.com/grails/grails-boot/issues/3
• Add dependency
compile "org.grails:grails-gsp-spring-boot:1.0.0.RC1"
compile "org.grails:grails-web:2.4.0.M2"
• Put gsptemplates in resources/templates folder
GSP

• Sample requesthandler
@RequestMapping("/show/{id}")
public ModelAndView show(@PathVariableLong id){
Person person =Person.read(id)
if(person) {
new ModelAndView("/person/show",[personInstance:Person.get(id)])
}else{
log.info "No entity fount for id:"+id
newModelAndView("redirect:/person/list")
}
}
GSP CONTINUED

@grails.gsp.TagLib
@org.springframework.stereotype.Component
class ApplicationTagLib{
static namespace ="app"
def paginate ={attrs ->
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"/>
GRAILS TAGLIB

Packaging as jar with embedded tomcat
$gradle build
$java -jarbuild/libs/mymodule-0.0.1-SNAPSHOT.jar
Packaging as war :configurebuild.groovy
//...
apply plugin:'war'
war{
baseName ='myapp'
version ='0.5.0'
}
//....
configurations {
providedRuntime
}
dependencies{
compile("org.springframework.boot:spring-boot-starter-web")
providedRuntime("org.springframework.boot:spring-boot-
starter-tomcat")
// ...
}
$gradle war
PACKAGING EXECUTABLE JAR AND WAR
FILES

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Grails Spring Boot

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