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Step 12. Dockerized Spring Boot application

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existing-spring-boot-app-modification/spring-petclinic-main
- Dockerfile
- docker-compose.yaml
- src/main/resources
  - application.properties

+47

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`@@ -0,0 +1,20 @@`
	`1`	`+FROM gradle:latest AS builder`
	`2`	`+WORKDIR /application`
	`3`	`+COPY . .`
	`4`	`+RUN --mount=type=cache,target=/root/.gradle gradle clean build -x test`
	`5`	`+`
	`6`	`+FROM bellsoft/liberica-openjre-alpine:21 AS layers`
	`7`	`+WORKDIR /application`
	`8`	`+COPY --from=builder /application/build/libs/*.jar app.jar`
	`9`	`+RUN java -Djarmode=layertools -jar app.jar extract`
	`10`	`+`
	`11`	`+FROM bellsoft/liberica-openjre-alpine:21`
	`12`	`+VOLUME /tmp`
	`13`	`+RUN adduser -S spring-user`
	`14`	`+USER spring-user`
	`15`	`+COPY --from=layers /application/dependencies/ ./`
	`16`	`+COPY --from=layers /application/spring-boot-loader/ ./`
	`17`	`+COPY --from=layers /application/snapshot-dependencies/ ./`
	`18`	`+COPY --from=layers /application/application/ ./`
	`19`	`+`
	`20`	`+ENTRYPOINT ["java","org.springframework.boot.loader.JarLauncher"]`

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`@@ -1,4 +1,27 @@`
`1`	`1`	`services:`
	`2`	`+spring-petclinic:`
	`3`	`+image:spring-petclinic:latest`
	`4`	`+build:`
	`5`	`+context:.`
	`6`	`+args:`
	`7`	`+DOCKER_BUILDKIT:1`
	`8`	`+restart:always`
	`9`	`+ports:`
	`10`	`+ -"8080:8080"`
	`11`	`+environment:`
	`12`	`+POSTGRES_DB_NAME:spring-petclinic`
	`13`	`+POSTGRES_HOST:postgres`
	`14`	`+POSTGRES_USERNAME:root`
	`15`	`+POSTGRES_PASSWORD:root`
	`16`	`+KAFKA_BOOTSTRAP_SERVERS:kafka:29092`
	`17`	`+healthcheck:`
	`18`	`+test:wget --no-verbose --tries=1 --spider http://localhost:8080/actuator/health \|\| exit 1`
	`19`	`+interval:30s`
	`20`	`+timeout:5s`
	`21`	`+start_period:30s`
	`22`	`+retries:5`
	`23`	`+depends_on:`
	`24`	`+ -postgres`
`2`	`25`	`postgres:`
`3`	`26`	`image:postgres:16.3`
`4`	`27`	`restart:always`

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`@@ -13,7 +13,7 @@ spring.jpa.show-sql=true`
`13`	`13`	`spring.messages.basename=messages/messages`
`14`	`14`	`#Spring Kafka`
`15`	`15`	`spring.kafka.consumer.group-id=visit`
`16`		`-spring.kafka.bootstrap-servers=localhost:9092`
	`16`	`+spring.kafka.bootstrap-servers=${KAFKA_BOOTSTRAP_SERVERS:localhost:9092}`
`17`	`17`	`# Actuator`
`18`	`18`	`management.endpoints.web.exposure.include=*`
`19`	`19`
`@@ -23,9 +23,9 @@ logging.level.org.springframework=INFO`
`23`	`23`	`spring.flyway.baseline-on-migrate=true`
`24`	`24`	`spring.flyway.baseline-version=0`
`25`	`25`	`#Datasource configuration`
`26`		`-spring.datasource.url=jdbc:postgresql://localhost/spring-petclinic`
`27`		`-spring.datasource.username=root`
`28`		`-spring.datasource.password=root`
	`26`	`+spring.datasource.url=jdbc:postgresql://${POSTGRES_HOST:localhost}/${POSTGRES_DB_NAME:spring-petclinic}`
	`27`	`+spring.datasource.username=${POSTGRES_USERNAME:root}`
	`28`	`+spring.datasource.password=${POSTGRES_PASSWORD:root}`
`29`	`29`	`spring.datasource.driver-class-name=org.postgresql.Driver`
`30`	`30`	`# Maximum time static resources should be cached`
`31`	`31`	`spring.web.resources.cache.cachecontrol.max-age=12h`

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