Spring Workhsop

This is a simple Spring application to introduce someone to Spring. Each commit adds additional features to the project.

"initial commit"

• create application with the initializer
  • dependencies: Spring Web
• Resources
  • https://start.spring.io/
  • https://spring.io/guides/gs/testing-web/#scratch

"create HelloWorldController"

• DemoApplicationJava
  • @SpringBootApplication
    • short for @Configuration & @EnableAutoConfiguration & @EnableWebMvc & @ComponentScan
    • @ComponentScan --> look for other components, configurations, and services, looks in the current package, this finds the HelloWorldController
• HelloWorldController
  • @RestController
    • alternative for @Controller & @ResponseBody
    • https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/web/bind/annotation/RequestBody.html
    • uses https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/http/converter/HttpMessageConverter.html in behind
  • @GetMapping
    • short for @RequestMapping(method=GET)
• HelloWorldController
  • @SpringBootTest
    • look for @SpringBootApplication and use that to start a Spring application context
  • @AutoConfigureMockMvc
    • does not start the server, but will be processed same as if the server was started.
    • alternative inject TestRestTemplate class to make a request to a running server
• Resources
  • https://spring.io/guides/gs/testing-web/

"use Repository"

• Movie
  • @Entity -> JPA Annotation to mark as entity
• MovieRepository
  • CrudRepository -> implements all Crud functions
  • function name is parsed there is also something possible like: findByNameAndReleaseDate(String name, LocalDate releaseDate)
    • https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#jpa.query-methods.query-creation
• MovieController
  • similar to HelloWorldController
  • can be removed by adding the following to the repository: @RepositoryRestResource(collectionResourceRel = "people", path = "people") from org.springframework.boot:spring-boot-starter-data-rest
    • see: https://docs.spring.io/spring-data/rest/docs/current/reference/html/#reference
• MovieRepositoryTest
  • @DataJpaTest -> creates an inmemory DB that allows us to also test queries
• MovieControllerTest
  • @MockBean creates a mock of the repository
  • similar to HelloWorldController
• Resources
  • https://spring.io/projects/spring-data#learn
  • https://docs.spring.io/spring-boot/docs/current/reference/html/features.html#features.testing
  • https://docs.spring.io/spring-framework/docs/5.3.13/reference/html/testing.html#testing