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Spring	Boot
Who	Am	I?
• You	will	find	me	here
https://github.com/tan9
http://stackoverflow.com/users/3440376/tan9
• My	Java	experience
• Java	and	Java	EE	development	– 8+	years
• Spring	Framework	– 6+	years
• Spring	Boot	– 1.5	years
2
Before	We Get Started…
• Join	the	channel:	http://bit.do/spring-boot
• Direct	link:	https://gitter.im/tan9/spring-boot-training
• Sign	in	using	your	GitHub account
• Or	sign	up	right	now!
3
Spring	Framework
4
Spring	Framework
• Inversion	of	Control	(IoC)	container
• Dependency	Injection	(DI)
• Bean	lifecycle	management
• Aspect-Oriented	Programming	(AOP)
• “Plumbing”	of	enterprise	features
• MVC	w/	RESTful,	TX,	JDBC,	JPA,	JMS…
• Neutral
• Does	not	impose	any	specific	programming	model.
• Supports	various	third-party	libraries.
5
Spring	2.5	JavaConfig
• Favor	Java	Annotation (introduced	in	Java	SE	5)
• @Controller,	 @Service and	@Repository
• @Autowired
• Thin	XML	configuration	file
6
<context:annotation-config/>
<context:component-scan
base-package="com.cht"/>
JavaConfig Keep	Evolving
• @Bean &	@Configuration since	3.0
• Get	rid	of	XML	configuration	files.
• @ComponentScan,	@Enable* and
@Profile since	3.1
• With	WebApplicationInitializer powered	by	
Servlet	3,	say	goodbye	to	web.xml too.
• @Conditional since	4.0
• We’re	able	to	filter	beans	programmatically.
7
Maven	Bill-Of-Materials	(BOM)
• Keep	library	versions	in	ONE	place.
• Import	from	POM’s	<dependencyManagement>
section.
• Declare	dependencies without	<version>:
8
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
</dependency>
Things Getting	Complicated
• Spring	seldom	deprecates	anything
• And	offers	little	opinion	or	guidance.
• Older	approaches	remain	at	the	top	in	search	results.
• Bootstrapping	can	be	painful
• Due	to	the	sheer	size	and	growth	rate	of	the	portfolio.
• Spring	is	an	incredibly	powerful	tool…
• Once	you	get	it	setup.
Should	you	use	spring	boot	in	your	next	project?	- Steve	Perkins
https://steveperkins.com/use-spring-boot-next-project/ 9
Spring	Boot
10
ThoughtWorks Technology	Radar
11
ThoughtWorks Techonlogy Rader	April	‘16
https://www.thoughtworks.com/radar
Spring	Boot
• Opinionated
• Convention over	configuration.
• Production-ready	non-functional	features
• Embedded	servers,	security,	metrics,	health	checks…
• Speed	up
• Designed	to	get	you	up	and	running	as	quickly	as	
possible.
• Plain	Java
• No	code	generation	and	no	XML	configuration.	
12
System	Requirements
• Spring	Boot	1.3	requires	Java	7+ by	default
• Java	8	is	recommended	if	at	all	possible.
• Can	use	with	Java	6	with	some	additional	configuration.
• Servlet	3.0+ container
• Embedded Tomcat	7+,	Jetty	8+,	Undertow	1.1+.
• Oracle	WebLogic	Server	12c	or	later.
• IBM	WebSphere	Application	Server	8.5	or	later.
• JBoss EAP	6	or	later.
13
Boot	With	Apache	Maven
14
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.cht</groupId>
<artifactId>inception</artifactId>
<version>0.0.1-SNAPSHOT</version>
<!-- Inherit defaults from Spring Boot -->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.5.RELEASE</version>
</parent>
<!-- Add typical dependencies for a web application -->
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<!-- Package as an executable jar -->
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Starter	POMs
• Make	easy	to	add	jars	to	your	classpath.
• spring-boot-starter-parent
• Provides	useful	Maven	defaults.
• Defines	version tags	for	“blessed”	dependencies.
• spring-boot-starter-*
• Provides	dependencies	you	are	likely	to	need	for	*.
15
First	Class
package com.cht.inception;
import org.springframework.boot.*;
import org.springframework.boot.autoconfigure.*;
import org.springframework.web.bind.annotation.*;
@RestController
@EnableAutoConfiguration
public class Application {
@RequestMapping("/")
String home() {
return "Hello World!";
}
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
16
mvn spring-boot:run
17
. ____ _ __ _ _
/ / ___'_ __ _ _(_)_ __ __ _    
( ( )___ | '_ | '_| | '_ / _` |    
/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |___, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.3.5.RELEASE)
2016-07-03 23:38:04.683 INFO 93490 --- [ main] com.cht.inception.Application : Starting Application on
2016-07-03 23:38:04.685 INFO 93490 --- [ main] com.cht.inception.Application : No active profile set,
2016-07-03 23:38:04.718 INFO 93490 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springfra
2016-07-03 23:38:05.482 INFO 93490 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with
2016-07-03 23:38:05.491 INFO 93490 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat
2016-07-03 23:38:05.491 INFO 93490 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine
2016-07-03 23:38:05.548 INFO 93490 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring emb
2016-07-03 23:38:05.548 INFO 93490 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationConte
2016-07-03 23:38:05.702 INFO 93490 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispa
2016-07-03 23:38:05.705 INFO 93490 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'charac
2016-07-03 23:38:05.705 INFO 93490 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hidden
2016-07-03 23:38:05.705 INFO 93490 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPu
2016-07-03 23:38:05.705 INFO 93490 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'reques
2016-07-03 23:38:05.833 INFO 93490 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerA
2016-07-03 23:38:05.876 INFO 93490 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto jav
2016-07-03 23:38:05.879 INFO 93490 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" ont
2016-07-03 23:38:05.879 INFO 93490 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produc
2016-07-03 23:38:05.898 INFO 93490 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webja
2016-07-03 23:38:05.898 INFO 93490 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] o
2016-07-03 23:38:05.921 INFO 93490 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/fa
2016-07-03 23:38:05.986 INFO 93490 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for J
2016-07-03 23:38:06.032 INFO 93490 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(
2016-07-03 23:38:06.036 INFO 93490 --- [ main] com.cht.inception.Application : Started ⏎
Application in 1.529 seconds (JVM running for 4.983)
18
Application	Properties
• Place	application.yaml in	classpath
• For	example:
• Configuring	embedded	server		can	be	as	easy	as:
19
server:
address: 127.0.0.1
port: 5566
YAML	(YAML	Ain’t Markup	Language)
• Superset	of	JSON.
• UTF-8!
• Really	good	for	hierarchical	configuration	data.
• But…	can't	be	loaded	via	the	@PropertySource.
20
my:
servers:
- dev.bar.com
- foo.bar.com
my.servers[0]=dev.bar.com
my.servers[1]=foo.bar.com
YAML
Java	Properties
Executable	JAR
• $ mvn package
• Build	and	package	the	project.
• Spring	Boot	will	repackage	it	into	an	executable	one.
• $ java -jar target/
inception-0.0.1-SNAPSHOT.jar
• It’s	just	running.
• The	jar	is	completely	self-contained,	you	can	deploy	and	
run	it	anywhere	(with	Java).
21
Spring	Boot:	Dev
22
Quick	Start
• Spring	Initializr Web	Service
• http://start.spring.io
• SpringSourceTools	Suite	(eclipse-based)
• https://spring.io/tools/sts/all
• IntelliJ	IDEA	Ultimate	(Costs	$$$)
• https://www.jetbrains.com/idea/
• Or	import	Spring	Initializr generated	project	from	IntelliJ	
IDEA	Community	Edition.
23
Developer	Tools
• Set	dev	properties,	like	disabling	cache.
• Automatic	restart when	resources	changed.
• LiveReload the	browser.
• Remote	update	and	debug.
24
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
Externalized	Configuration
1. Command	line	arguments.
2. Properties	from SPRING_APPLICATION_JSON.
3. JNDI	attributes	from java:comp/env.
4. Java	System	properties	(System.getProperties()).
5. OS	environment	variables.
6. RandomValuePropertySource for	random.*.
7. Application	property	files.
8. @PropertySource on	@Configuration.
9. SpringApplication.setDefaultProperties().
25
Application	Property	Files	Lookup
• Profile	and	File	Type	Priority
1. application-{profile|default}.properties	/	.yml /		.yaml
2. application.properties/	.yml /	.yaml
• Location	Priority
1. A	/config subdirectory	of	the	current	directory.
2. The	current	directory.
3. A	classpath /config package.
4. The	classpath root.
26
Property	Name	Relaxed	Binding
Property Note
person.firstName Standard	camel	case	syntax.
person.first-name Dashed	notation,	recommended	
for	use	in	.properties	and	.yml files.
person.first_name Underscore	notation,	alternative	
format	for	use	in	.properties	and	
.yml files.
PERSON_FIRST_NAME Upper	case	format.	Recommended	
when	using	a	system	environment	
variables.
27
@ConfigurationProperties
• It	is	Type-safe.
• More	clear	and	expressive	than	
@Value("{connection.username}")
28
@lombok.Data
@Component
@ConfigurationProperties(prefix = "connection")
public class ConnectionProperties {
private String username = "anonymous";
@NotNull
private InetAddress remoteAddress;
}
Incorporate	Our	@Configurations
29
@Configuration
@EnableAutoConfiguration
@ComponentScan
public @interface SpringBootApplication {
...
}
@Order(Ordered.LOWEST_PRECEDENCE - 1)
public class
EnableAutoConfigurationImportSelector
implements DeferredImportSelector...
Configuration	Override	
Convention
• Always	look	up	the	properties	list	first
• http://docs.spring.io/spring-
boot/docs/current/reference/html/common-
application-properties.html
• Write	@Configurations	and	@Beans	if	needed
• Then	@ComponentScan them	in.
• That’s	what	you	are	really	good	at.
• AutoConfigurations just	serves	as	a	fallback.
30
Spring	Boot:	Run
31
Spring	Boot	Actuator
“An	actuator	is	a	manufacturing	term,	referring	to	a	
mechanical	device	for	moving	or	controlling	
something.
Actuators	can	generate	a	large	amount	of	motion	
from	a	small	change.”
32
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
Production-Ready	Endpoints
• Spring	Configuration
• autoconfig,	beans,	configprops,	env and	mappings
• Logging	&	stats
• logfile,	metrics,	trace
• Informational
• dump,	info,	flyway,	liquibase
• Operational
• shutdown
33
Health	Information
• Beans	implements	HealthIndicator
• You	can	@Autowired what	you	need	for	health	
checking.
• Result	will	be	cached	for	1	seconds	by	default.
• Out-of-the-box	indicators
• Application,	DiskSpace,	DataSource,	Mail,	Redis,	
Elasticsearch,	Jms,	Cassandra,	Mongo,	Rabbit,	Solr…
34
Metrics
• Gauge
• records	a	single	value.
• Counter
• records	a	delta	(an	increment	or	decrement).
• PublicMetrics
• Expose	metrics	that	cannot	be	record	via	one	of	those	
two	mechanisms.	
35
Spring	Boot:	Ext
Custom	AutoConfigurationsand	ConfigurtaionProperties
36
Auto	Configuration
• META-INF/spring.factories
• Nothing	special	but	@Configuration.
• Spring	Boot	will	then	evaluate	all	AutoConfiguration
available	when	bootstrapping.
37
# Auto Configure
org.springframework.boot.autoconfigure.EnableAutoConfiguration=
com.cht.inception.autoconfigure.DemoAutoConfiguration
@ConditionalOn*
• Eliminating	all	@Configuration	will	not	work.
• Knowing	and	using	built-ins	where	possible
• @ConditionalOnBean
• @ConditionalOnClass
• @ConditionalOnMissingBean
• @ConditionalOnMissingClass
• @ConditionalOnProperty
• …	and	more
38
@Order matters
• Hints	for	Spring	Boot
• @AutoConfigureAfter
• @AutoConfigureBefore
• You	still	have	to	know	what	underlying
• Not	every	operation	is	idempotent	or	cumulative.
• WebSecurityConfigurerAdapter for	example.
39
@ConfigurationProperties
• Naming things	seriously
• There are only two hard things in Computer Science:
cache invalidation and naming things. -- Phil Karlton
• It	will	be	an	important	part	of	your	own	framework!
• Generates	properties	metadata	at	compile	time
• Located	at	META-INF/spring-configuration-
metedata.json.
• A	Spring	Boot-aware	IDE	will	be	great	help	for	you.
40
Deploying
41
Package	as	WAR
• POM.xml
• <packaging>war</packaging>
42
@SpringBootApplication
public class Application
extends SpringBootServletInitializer
implements WebApplicationInitializer {
...
}
JBoss EAP
• JBoss EAP	v6.0	– 6.2
• Have	to	remove	embedded	server.
• JBoss EAP	v6.x
• spring.jmx.enabled=false
• server.servlet-path=/*
• http://stackoverflow.com/a/1939642
• Multipart	request	charset	encoding	value	is	wrong.
• Have	to	downgrade	JPA	and	Hibernate.
• JBoss EAP	v7
• Haven’t	tried	yet.
43
Oracle	WebLogic	Server
• WebLogic	11g	and	below
• Not	supported.
• WebLogic	12c
• Filter	registration	logic	is	WRONG!
• https://github.com/spring-projects/spring-
boot/issues/2862#issuecomment-99461807
• Have	to	remove	embedded	server.
• Have	to	downgrade	JPA	and	Hibernate.
• Have	to	specify	<wls:prefer-application-
packages/> in	weblogic.xml.
44
IBM	WebSphere	AS
• WebSphere	AS	v8.5.5
• Have	to	remove	embedded	server.
• Have	to	downgrade	JPA	and	Hibernate.
45
What’s	Next?
46
Try	JHipster
https://jhipster.github.io/
and	to	learn	something	from	him.
47
References
• Introduction	to	Spring	Boot	- Dave	Syer,	Phil	Webb
• http://presos.dsyer.com/decks/spring-boot-intro.html
• Spring	Boot	Reference	Guide
• http://docs.spring.io/spring-boot/docs/current/
48

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