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README.md

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Steps:

1 - Spring Initializr

  • Go to https://start.spring.io/
  • Change the Artifact to "item-catalog"
  • Select: web, acutator, devtools, jpa, h2, cache, lombok
  • Click Generate
  • Find the download, unzip and move to your workspace/repo folder

2 - Import into IntelliJ

  • Select the maven pom.xml and import
  • Wait...
  • Update the application.properties
    • management.endpoints.web.exposure.include=*
    • management.endpoint.health.show-details=always
    • spring.datasource.platform=h2
    • spring.jpa.show-sql=true
  • Select "run" to verify the app is running
  • Hit the actuator
    • http :8080/actuator/health

3 - Create a traditional JPA Entity + Repository + Controller

  • Create a package "items"
  • Create a class Item
    • Add fields id, upc, name, size, lastModified
    • Add Lombok - @Data, @NoArgs, @Entity and @Id (plus strategy Identity)
  • Create a class ItemRepository
    • extends JpaRepository<Item, Long>
    • add method Optional getByUpc
  • Create a class ItemController
    • add @RestController
    • add @GetRequest accepting UPC (not id)
      • throw custom exception
      • @ResponseStatus(code = HttpStatus.NOT_FOUND, reason = "The resource requested does not exist")
  • Add data.sql
  • Restart the application
  • Test the endpoint
    • http :8080/items/013764027053

4 - Introduce Spring @Cacheable

  • Add the @Cacheable annotation to the get method
  • Add a println to demonstrate the cache miss
  • Restart and test the endpoint
    • Perform a get to show the cash miss
    • Use gfsh to demonstrated that the value is in the region
    • Perform a second get to now show its getting the value from cache