Spring Boot

SPRING BOOT
HONGSEONG JEON
HSJEON70@GMAIL.COM
MAY 24, 2016
Easy to create, run spring applications

INTRODUCING SPRING BOOT
 Easy to create stand-alone, production-grade Spring based
applications that you can “just run”.
 It needs very little spring configuration.
 Create Java applications that can be started using java –jar or
more traditional war deployments.
 Primary goals for the Spring Boot.
 Provide a radically faster and widely accessible getting started
experience for all Spring development.
 Be opinionated out of the box, but get out of the way quickly as
requirements start to diverge from the defaults.
 Provide a range of non-functional features that are common to
large classes of projects (e.g.embedded servers, security,
metrics, health checks, externalized configuration).
 Absolutely no code generation and no requirement for XML
configuration.

SYSTEM REQUIREMENTS
 Spring Boot 1.4.0 requires Java 7 and Spring Framework 4.1.5
or above.
 Servlet containers
 Servlet 3.0+ compatible container

DEVELOPMENT ENVIRONMENT
 Build tool that supports dependency management
 Maven – maven.apache.org
 Gradle – www.gradle.org
 Development IDE
 Eclipse or Any Editor
 Eclipse plugin
- m2ecipse
- gradle

SIMPLE APPLICATION
 New Gradle Project
 Create HelloApplication

SIMPLE APPLICATION
 Create HelloController
 Create application.properties in the resources

SIMPLE APPLICATION
 Run HelloApplication at the eclipse
 Run http://localhost:8010/hello

SPRING BOOT ADMIN
 Spring Boot Admin is a simple application to manage and
monitor your Spring Boot Applications.
 The applications register with our Spring Boot Admin Client
(via http) or are discovered using Spring Cloud (e.g. Eureka).

SPRING BOOT ADMIN APPLICATION
 Create New Gradle Project
 Add spring boot server libraries to project dependencies.
 Create SpringBootAdminApplication
dependencies {
compile 'de.codecentric:spring-boot-admin-server:1.3.2'
compile 'de.codecentric:spring-boot-admin-server-ui:1.3.2'
compile 'org.springframework.boot:spring-boot-starter-web:1.3.1.RELEASE'
}

SPRING BOOT ADMIN APPLICATION
 Application properties
# =======================
# Tomcat Configuration
# =======================
server.tomcat.max-threads=10
server.address=127.0.0.1
server.port=9090
# =======================
# Security Configuration
# =======================
security.user.name=admin
security.user.password=admin
management.security.role=SUPERUSER
management.security.enabled=false

SPRING BOOT ADMIN CLIENT
 Add spring-boot-admin-starter-client to project dependencies.
 Add run task in the build.gradle
dependencies {
compile 'de.codecentric:spring-boot-admin-starter-client:1.3.2‘
compile 'org.springframework.boot:spring-boot-starter-web:1.3.1.RELEASE'
}
task run (dependsOn: classes, type: JavaExec) {
classpath = sourceSets.main.runtimeClasspath
main = 'com.example.myproject.HelloApplication'
}

SPRING BOOT ADMIN CLIENT
 Add spring boot admin properties in the application.properties
# Tomcat Configuration
server.address=127.0.0.1
server.port=8010
# =======================
# JMX Configuration
#management.port=8011
#management.address=127.0.0.1
management.security.role=SUPERUSER
management.security.enabled=false
# ============================================
# Client Configuration for Spring Boot Admin
info.version=1.0
info.info=spring boot hello application
spring.boot.admin.client.name=hello
spring.boot.admin.url=http://127.0.0.1:9090
spring.boot.admin.username=admin
spring.boot.admin.password=admin
spring.boot.admin.client.health-url=http://localhost:8010/health
spring.boot.admin.client.service-url=http://localhost:8010
spring.boot.admin.client.management-url=http://localhost:8010

SPRING BOOT ADMIN TESTING
 Run HelloApplication

SPRING BOOT ADMIN TESTING
 Run SpringBootAdminApplication
 http://localhost:9090/
 Application Dashboard

SPRING BOOT ADMIN
 Applications Details

SPRING BOOT ADMIN
 Application Details

SPRING BOOT ADMIN
 Application Environment

SPRING BOOT ADMIN
 Application Logging

SPRING BOOT ADMIN
 Application JMX

SPRING BOOT ADMIN
 Application Threads

SPRING BOOT ADMIN
 Application Trace

DATABASE CONFIGURATION
 H2 Database
 H2 is written in Java and is easily runs as an embedded in-
memory database.
 Because it is an embedded in memory database, it makes your
build portable.
 H2 Database and Spring Boot
 By adding this dependency to your gradle, Sring Boot will
automatically configure the H2 database.
 JDBC DataSource Configuration in the application.properties.
dependencies {
compile 'com.h2database:h2'
}
spring.datasource.jndi-name=java:jboss/datasources/customers

 JDBC DataSource Configuration in the application.properties
# ===============================
# = DATA SOURCE
# ===============================
# Set here configurations for the database connection
spring.datasource.url = jdbc:h2:d:/applications/springBoot/data/boot.db
# JDBC Driver class
spring.datasource.driver-class-name=org.h2.Driver
# Username and password
spring.datasource.username = sa
spring.datasource.password = sa
# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.testWhileIdle = true
spring.datasource.validationQuery = SELECT 1
# Number of ms to wait before throwing an exception if no connection is available.
spring.datasource.max-wait=10000
# Maximum number of active connections that can be allocated from this pool at the same
time.
spring.datasource.max-active=50
# Validate the connection before borrowing it from the pool.
spring.datasource.test-on-borrow=true

 H2 Database Web Console
 Enable H2 Database Web Console in the application.properties
 H2 Database Web Console : http://${serviceUrl}/h2-console/
# Enable H2 Database Web Console
spring.h2.console.enabled=true

 Spring Boot Admin – Database Monitoring

SPRING DATA JPA
 Using Spring Data JPA can save you a lot of time when
interacting with the database.
 Spring Data JPA implements the Repository Pattern.
 Domain Driven Design
 Create a Persistence Repository
 Defining a repository for our City domain class is as simple as
defining a interface and extending the CrudRepository
interface.

SPRING DATA JPA
 Create a City Loader component

SPRING DATA JPA
 Run Application

SPRING DATA JPA
 Confirm loaded data

SPRING REST CONTROLLER
 Create a CityService interface
 Create a CityServiceImpl class

SPRING REST CONTROLLER
 Create a CityController
 Testing

SPRING BOOT EHCACHE
 Gradle Dependency for ehcache
 Ehcache configuration – config/ehcache.xml
dependencies {
compile 'net.sf.ehcache:ehcache-core:2.6.10'
}
<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance"xsi:noNamespaceSchemaLocation="ehcache.xsd"
updateCheck="true"monitoring="autodetect"dynamicConfig="true" statistics="true">
<diskStore path="java.io.tmpdir" />
<cache name="myCache"
maxEntriesLocalHeap="5000“ maxEntriesLocalDisk="1000" eternal="false"
diskSpoolBufferSizeMB="20“ timeToIdleSeconds="300"
timeToLiveSeconds="600“ memoryStoreEvictionPolicy="LFU"
transactionalMode="off">
<persistence strategy="localTempSwap" />
</cache>
</ehcache>

SPRING BOOT EHCACHE
 Enable Cache and Define a CacheManager bean in the
Application class.

SPRING BOOT EHCACHE
 Apply Cacheable annotation
 Run and Testing

SPRING BOOT EHCACHE
 Ehcache Statistics on the Spring Boot Admin

SPRING BOOT WEB APPLICATION
 Thymeleaf is a modern server-side Java template engine for
both web and standalone environments.
 Thymeleaf is ideal for modern-day HTML5 JVM web
development
 http://www.thymeleaf.org/
 Gradle Dependency for Thymeleaf
 Create a HelloController
dependencies {
compile 'org.springframework.boot:spring-boot-starter-thymeleaf'
}

 Create a greeting.html
 src/main/resources/templates/greeting.html
 Run and Testing
<!DOCTYPE HTML>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>Getting Started: Serving Web Content</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</head>
<body>
<p th:text="'Hello, ' + ${name} + '!'" />
</body>
</html>

 Spring Boot Admin – HTTP API Monitoring

SPRING BOOT APPLICATION
 Project Package Layout
Spring Boot main application class
 Resources Layout

REFERENCES
 https://projects.spring.io/spring-framework/
 http://projects.spring.io/spring-boot/
 http://codecentric.github.io/spring-boot-admin/1.3.0/
 http://www.thymeleaf.org/
 http://gradle.org/
 http://www.h2database.com/html/main.html
 Example projects repository
- https://bitbucket.org/jlookexamples/examples-spring-boot-admin
- https://bitbucket.org/jlookexamples/examples-spring-boot
- https://bitbucket.org/jlookexamples/examples-hello

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