Building a REST Service in minutes with Spring Boot

Building a REST Service in minutes with Spring Boot

• 1.
  Spring Boot Building aREST Service in minutes
• 2.
  omri.spector@develeap.com I am… • OmriSpector, CEO deveLeap • deveLeap mission – Helping development teams use the right tools, technologies & architecture to achieve their business objective. – Specialize in Java, CI and the JVM eco-system • Omri – Active commercial developer since 1985 – In Java since 2004 – Managed large multi national development groups
• 3.
  omri.spector@develeap.com Agenda • What isSpring Boot • Creating a SpringBoot Application • Creating a basic REST Service (POST, GET) • Connecting to a Database • Going forward
• 4.
  omri.spector@develeap.com What is Springboot • Spring • Opinionated • Geared for fast development of robust micro services • Others in this arena – Drop wizard – Play – Vert.x – Jodd – …
• 5.
  omri.spector@develeap.com Where would Iuse SpringBoot? • Green Field – Get new project up & running in no time without compromising architecture and infrastructure • Modernizing Legacy – Gradually modernize legacy monolith applications by moving aspects to Spring Boot “micro-services”
• 6.
  Let’s code
• 7.
  omri.spector@develeap.com Starting a project •https://start.spring.io/ – Actuator: “Production Ready” – Web: Web related functionality (e.g. MVC) – Devtools: Hot swap during development – Lombok: “Less boilerplate” Later we can easily add more, e.g. “data”, “cloud”,…
• 8.
  omri.spector@develeap.com Alternative start -JHipster • JHipster is a code generation tool that offers a much more comprehensive starting point • It adds opinioned use of the client side stack: Angular, Gulp, SASS, Bower, etc. • It adds many common features and UI out of the box • The amount of code it creates is large – which can be viewed as good or bad
• 9.
  omri.spector@develeap.com What we created •Pom – spring boot pom • DemoApplication – – @SpringBootApplication: spring mvc, scanner – Main: embedded tomcat • Resources/static, resources/template • Application.properties (empty) • DemoApplicationTests – context loads, Spring test
• 10.
  omri.spector@develeap.com Build & Run •Fat Jar for easy deploy • Actuator endpoints: – /health, – /env, – /metrics, – : • Hot swap
• 11.
  omri.spector@develeap.com Chapter 1 –POST, GET • Domain: Simplify with lombok • Services: @Service pojo for all business logic • Controller: @Controller utilizing: – @RequestMapping (hierarchical) – @ResponseBody – to avoid writing views – @RequestBody & @PathVariable on params • PostMan – Post, Get, Get non existing
• 12.
  omri.spector@develeap.com Chapter 2 –HTTP Errors • Return 404 using RuntimeException with @ResponseStatus
• 13.
  omri.spector@develeap.com Chapter 3 –Working with a DB • Add spring-boot-starter-data-jpa and a db driver • Add a CrudRepository based @Repository • Model object is now and @Entity with an @id – Make sure name matches table name! • Changed service to use it • Configuring the db connection in application properties
• 14.
  omri.spector@develeap.com Chapter 4 –Getting a list • Many options, from findAll to HQL to SQL • We will use Spring Data Proxy • Of course this is naïve, and is often improved: – Limiting the fields returned or even defining a “light” version – Adding sort and paging Iterable<Artist> findByNameContaining(String s);
• 15.
  omri.spector@develeap.com Chapter 5 –It doesn’t stop here • Spring is a very comprehensive project • Spring-Boot wraps many of it’s aspects and integrates many other successful open source facilities
• 16.
  omri.spector@develeap.com Typical additions • SpringSecurity • Spring Social – Facebook, Twitter, LinkedIn… • Spring Cloud – Service discovery, Circuit breakers, control bus, … • Schema Management – Liquibase, Flyway • Front end assets management – Web jars • Transaction Management • Spring Data – Both Relational and many NoSQL And the list goes on…
• 17.
  omri.spector@develeap.com In Summary • Springboot creates an: – easy to deploy – executable – “fat” jar • Management services out of the box • In several minutes and very little code we get: – REST against a db backend – JPA based ORM – And the spring power to easily add so much more
• 18.
  omri.spector@develeap.com Shameless Plug Are youconsidering the move to “micro-services”? Don’t hesitate to call: omri.spector@develeap.com
• 19.
  Thank you! www.develeap.com Slide Share: http://www.slideshare.net/omrispector/building-a-rest-service-in-minutes-with-spring-boot