This document discusses Spring Boot and compares it to traditional Spring frameworks. It notes that Spring Boot is opinionated and aims to accelerate time to market by significantly reducing the amount of boilerplate code needed. The document shows an example of the boilerplate code required for traditional Spring configuration versus the single class needed for basic Spring Boot configuration. It also provides metrics on the lines of code, WAR size, and app start time for a sample app built with both traditional Spring and Spring Boot, demonstrating the reduced complexity of Spring Boot.

1. TECHNOLOGY SOLUTIONS DELIVERED
Using Spring Boot Effectively in Cloud
Foundry
Josh Ghiloni (@joshghiloni)
Senior Consultant, ECS Team

2. Agenda
 What is Spring? Why use it?
 What is Spring Boot? Why use it?
 Side by side with traditional Spring
 Spring Boot in Action

3. What is Spring? Why use it?
 Premier Java inversion of control (IoC) /
dependency injection framework
 Presents common design patterns as first class
objects
 Robust community of developers
 Responsive component owners

4. What is Spring Boot? Why use it?
 Opinionated
It knows what you probably want your app
configuration to look like
 Passive
It knows to get out of the way when it’s wrong
 Accelerated time to market
Significantly less boilerplate code necessary

5. Side by side with Traditional Spring
Traditional Spring Spring Boot
Lines of Code Written 147 (34 actual app code) 53 (34 actual app code)
Compiled WAR Size 5202 KB 16539 KB
App Start Time ~ 4 sec ~ 7 sec

6. Side by side with Traditional Spring
Boilerplate code (Traditional Spring)
@Configuration
@ComponentScan
@Order(Ordered.HIGHEST_PRECEDENCE)
public class AppInitializer extends
AbstractDispatcherServletInitializer {
// 15 lines of code omitted
}
@Configuration
@Order(Ordered.HIGHEST_PRECEDENCE + 10)
public class SecurityInitializer extends
AbstractSecurityWebApplicationInitializer {
// 3 lines of code omitted
}
@Configuration
@EnableWebMvc
public class WebConfig {
// 10 lines of code omitted
}
@Configuration
@EnableWebMvcSecurity
public class WebSecurityConfig extends
WebSecurityConfigurerAdapter {
// 34 lines of code omitted
}

7. @SpringBootApplication
public class SpringBootExampleApplication extends SpringBootServletInitializer {
public static void main(String[] args) {
SpringApplication.run(SpringBootExampleApplication.class, args);
}
@Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(SpringBootExampleApplication.class);
}
}
Side by side with Traditional Spring
Boilerplate code (Spring Boot)

8. Spring Boot in action
 Code located at
https://github.com/jghiloni/cf-meetup-march2015