Micro Apps

Modern microservices for Post-Kubernetes Era. An open source framework for building and deploying distributed applications.
This template monorepo style project allows you to write your application as a modular monolith and deploy it as a set of microservices.

Monorepo(services, pipelines and libs) project to showcase workspace setup with multiple apps and shared libraries
This template project has the best of both worlds: the development velocity of a monolith, with the scalability, security, and fault-tolerance of microservices.

Features

1. Modular-monolith distributed applications

2. Polyglot - Support multiple languages (java, kotlin, groovy)

3. Support multiple app frameworks (apache-beam, cli, micronaut, quarkus)

4. Support multiple serialization methods (JSON, Avro, ProtoBuf)

5. A type-safe cascading configuration with konf

6. Integrated with best testing frameworks (kotest , MockK)

7. Build lightweight Docker and OCI images with Jib

8. Build native binaries using GraalVM

9. Cloud Native (Service Mesh, health checks, observability)

10. Platform independent Observability instrumentation via OpenTelemetry

11. Deployment automation with kustomize and Event-driven Autoscaling with KEDA

12. End-to-End Google Cloud DevOps flow pop-kustomize

13. JReleaser The quick and effortless way to release your project!

14. 

Quality

Sub Modules

Services	Libs	Pipelines
GraphQL-r2dbc	Core	WordCount
Redis OM	KBeam	Classifier
Streams	Spring	Ingestion
Account	GraphQL
	Test
	Model

Setup

Prerequisites

sdk rm java
sdk i java 17.0.8-zulu
java --version

sdk rm gradle
sdk i gradle
gradle --version

sdk i springboot
sdk i quarkus

# optional
sdk i java 21-graal
# Do you want java 21-graal to be set as default? (Y/n): n

Oracle GraalVM Container Images

IntelliJ Plugins

1. Spotless
2. Ktlint
3. Kotest
4. GraphQL
5. Env files support
6. lombok

Contribution

Pre-commit checks

# spotlessCheck - Checks that sourcecode satisfies formatting steps.
gradle spotlessCheck
# spotlessApply - Applies code formatting steps to sourcecode in-place.
gradle spotlessApply

Run tests, lint, coverage for all subprojects

gradle check

Code Quality

# Generates code coverage HTML and XML reports for all enabled test tasks in one project.
gradle koverMergedReport

Software Composition Analysis (SCA) tool that attempts to detect publicly disclosed vulnerabilities contained within a project’s dependencies.

gradle dependencyCheckAggregate

Maintenance

# Update versions in libs.versions.toml file
gradle versionCatalogUpdate --interactive

Run

Docker

start app dependencies: postgres, redis

# start local sonarqube
docker compose up postgres # docker compose up -V postgres
# stop local postgres before restart again
docker compose down # docker compose down -v

start optional CI/CD infra dependencies: sonarqube, nexus

# start local sonarqube
docker compose up sonarqube # docker compose up -V sonarqube
# stop local sonarqube before restart again
docker compose down
# (optional) this remove volumes - needed when you upgrade image versions 
docker compose down -v
# start local nexus
docker compose up nexus

Dashboard access

• SonarQube → Browser http://localhost:9000 → user: admin, password: admin
• Grafana → Browser http://localhost:3000/plugins/redis-app/ → user: admin, password: admin
• Redis Insight → Browser http://localhost:8001/
• Jaeger → Browser http://localhost:16686
• Kibana → Browser http://localhost:5601
• Prometheus → Browser http://localhost:9090

See gradle commands for this project.

Apps

Apache Beam Pipelines

Explore Wordcount Pipeline

Explore Streaming Ingestion Pipeline

Explore Classifier Pipeline

Quarkus

Explore REST, OpenAPI, OpenID Connect, API

Explore GraphQL API

Kotlin-gRPC

Explore Account-gRPC API

Explore Kotlin-gRPC API

Explore Kotlin-gRPC API

Spring

Explore Spring-RSocket Chat APP

Explore Spring CRUD + Redis Search API

Svelte

Explore SvelteKit WebApp

Libs

Reusable libraries

Explore Apache Beam Kotlin Extensions

Explore Shared gRPC Components

Shared code within this repo

Explore Shared Core Code

Explore Shared Model Objects

Explore Shared Pipelines Code

Explore Shared Spring Services Code

Explore Shared Spring GraphQL Services Code

Explore Shared ProtoBuf Contracts

Explore Shared Test Fixtures

Inspiration

• Creating a Multi Module Project
• Microservices in a Post-Kubernetes Era link
• Why is a workspace (or monorepo) needed?
• Gradle Setup arara
• GoogleCloudPlatform's microservices-demo
• Google Service Weaver: A Framework for Writing Distributed Applications