ivanopassari / java-example-application

Java Example Application

Java Example application

Java 8 example application.

• Spring boot v2.3.8
• Java 8 (OpenJDK)
• Dependencies:
  • spring-boot-starter-actuator
  • spring-boot-starter-web
  • spring-boot-starter-test
  • micrometer-registry-prometheus
• Graceful shutdown
• Liveness&Readiness probes
• Actuator endpoints enabled:
  • health
  • info
  • env
  • loggers
  • metrics
  • prometheus
• Standardized, layered Dockerfile
• standardized configuration management:
  • configurations under src/main/resources/application.yaml
  • You can choose a profile using the environment variable ACTIVE_PROFILES.
• The container is run with the user app (UID 1000, GID 1000) to avoid the root user

Docker Image Build

The Dockerfile specifies how the image is created. This file creates a layered image, click here for more info. The base image is eclipse-temurin:8u342-b07-jre-focal.

Docker entrypoint bin/docker-entrypoint.sh.

Docker build command docker build -t <tag> .

Actuator

Spring Boot Actuator enabled on src/main/resources/application.properties:

management.endpoints.web.exposure.include = health, info, env, loggers, metrics, prometheus, configprops

Connect to a Database

You can connect a MySQL database by activating the spring profile db. The environment variable is ACTIVE_PROFILES=db. In the default behaviour, no database is connected. You can also set other environment variables:

DB_URL default value localhost:3306

DB_USER default value user

DB_PASSWORD default value password

Rest Interface

The application exposes the default context path /test-app/v1.

The class TestController exposes some test endpoints.

For example, you can get the instance id calling GET localhost:8080/test-app/v1/app/id

AWSCodeBuild

You can build this project with AWSCodeBuild. The configuration file under the root directory is buildspec.yml. This file builds the maven project and uploads a docker image to Elastic Container Registry.

Remember to define your Elastic Container Registry parameters AWS_DEFAULT_REGION,AWS_ACCOUNT_ID,AWS_DEFAULT_REGION,IMAGE_TAG.