Building a REST Service in minutes with Spring Boot
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The document outlines a presentation by Omri Spector on building a REST service using Spring Boot, emphasizing its rapid development capabilities for microservices and its integration with databases. It covers the basics of creating a Spring Boot application, working with HTTP methods, error handling, and connecting to a database with JPA. Additional topics include starter options, management services provided out of the box, and potential extensions like Spring Security and Cloud.
Building a REST Service in minutes with Spring Boot
- 1. Spring Boot Building a REST Service in minutes
- 2. [email protected] I am… • Omri Spector, 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. [email protected] Agenda • What is Spring Boot • Creating a SpringBoot Application • Creating a basic REST Service (POST, GET) • Connecting to a Database • Going forward
- 4. [email protected] What is Spring boot • Spring • Opinionated • Geared for fast development of robust micro services • Others in this arena – Drop wizard – Play – Vert.x – Jodd – …
- 5. [email protected] Where would I use 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. [email protected] 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. [email protected] 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. [email protected] 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. [email protected] Build & Run • Fat Jar for easy deploy • Actuator endpoints: – /health, – /env, – /metrics, – : • Hot swap
- 11. [email protected] 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. [email protected] Chapter 2 – HTTP Errors • Return 404 using RuntimeException with @ResponseStatus
- 13. [email protected] 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. [email protected] 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. [email protected] 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. [email protected] Typical additions • Spring Security • 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. [email protected] In Summary • Spring boot 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. [email protected] Shameless Plug Are you considering the move to “micro-services”? Don’t hesitate to call: [email protected]
Editor's Notes
- #8: Devtools in IDE – only when running in debug mode. “Mostly” works. Not as fast or total as Jrebel.
- #10: Tomcat alternatives: jetty, undertow, grizzly, …
- #11: Note: Fat jar created by maven, not when running from IDE
- #15: To add paging: - findByNameContaining(String s, Pageable pageable); and pass PageRequest