Spring Boot Workshop

By FaustoC

Basics

Generating a project

Generate a gradle project from https://start.spring.io

Suggested values to be filled in the form:

Spring Boot 2.0.0
Group: org.test
Artifact: tvseries
Starters: H2, JDBC, JPA

After that, run:

./gradlew bootRun

Convert it as an IntelliJ project. Edit build.gradle file and add:

apply plugin: 'idea'

After that, run:

./gradlew idea

Starters

Spring Boot starters are a sets of libraries that includes everything for specific funcionalities.

Starters	Description
_{spring-boot-starter}	_{Base starter. It's a dependency of the other starters}
_{spring-boot-starter-jdbc}	_{For database connections based on JDBC}
_{spring-boot-starter-test}	_{For testing, stubbing and mocking}
_{spring-boot-starter-security}	_{Depedencies for spring-security}
_{spring-boot-starter-social-x}	_{x -> {Facebook, Twitter, LinkedIn}}
...	...

Example spring.profile of spring-boot-starter-test:

provides: spring-test, spring-boot, junit, mockito,
hamcrest-library, assertj, jsonassert, json-path

A runnable application

@SpringBootApplication
public class TvSeriesApplication {

  public static void main(String[] args) {
      SpringApplication.run(TvSeriesApplication.class, args);
  }
}

REST Services -> Entities

@Entity
public class Actor {
  @Id
  @GeneratedValue
  private Integer id;
  private String name;

  ...
}

@Entity
public class TvSerie {
  @Id
  @GeneratedValue
  private Integer id;
  private String name;
  @ManyToMany
  private List<Actor> actors;

  ...
}

REST Services -> Repository and Runner

@Repository
public interface TvSeriesRepository extends
                 CrudRepository<TvSerie, Long> {}

public class StartupRunner implements CommandLineRunner {
  private final Log logger = LogFactory.getLog(getClass());
  @Autowired
  private TvSeriesRepository repository;

  public void run(String... args) {
    logger.info("Number of tvSeries" + repository.count());
  }
}

public class TvSeriesApplication {
  ...

  @Bean
  public StartupRunner scheduleRunner() {
    return new StartupRunner();
  }
}

REST Services -> Controller

build.gradle

...
dependencies {
  compile('org.springframework.boot:spring-boot-starter-web')
}
...

@RestController
@RequestMapping("tvseries")
public class TvSeriesController {

  @Autowired
  private TvSeriesRepository repository;

  @RequestMapping(value = "", method = RequestMethod.GET)
  public Iterable<TvSerie> getAllTvSeries() {
    return repository.findAll();
  }
}

Spring Data REST