Learn Micronaut from a Microservices Solutions Architect

Architecture-first Micronaut microservices: Data Access, Reactive Systems, Kafka, Security, and Testing using Docker

What you’ll learn
✓ Micronaut architecture and core mechanisms.
✓ How to initialize and run a Micronaut Maven application using the Micronaut CLI and Micronaut Launch.
✓ How to properly structure a Micronaut project with Maven using Micronaut’s Bill of Materials (BOM).
✓ How to connect and integrate our Micronaut microservices with relational databases using JPA, JDBC, and R2DBC, both imperatively and reactively.
✓ How to connect and integrate our Micronaut microservices with non-relational MongoDB, both imperatively and reactively.
✓ How to integrate our Micronaut microservices with databases using transactions and roll back writes on errors.
✓ The architecture of imperative and reactive RESTful microservices under Micronaut’s native support.
✓ Implement client-to-server calls (imperatively and reactively) between microservices using Micronaut’s HTTP client native support.
✓ How to explore and test the capabilities of reactive streaming and implement backpressure mechanisms.
✓ Apply Jakarta Validation and create custom validation constraints for real business rules
✓ How to use Swagger with Micronaut’s native OpenAPI support and how to generate a Micronaut server from an OpenAPI specification.
✓ How to secure our application using Micronaut’s security features (Bearer/JWT authentication with Keycloak as IdP, session, cookie, and ID token).
✓ How to perform authorized (white-hat) security testing on a vulnerable yet secured microservice and harden it afterwards.
✓ Approach for unit, component (semi-integration), and full integration testing of microservices using Micronaut’s testing framework and Mockito.
✓ Design production-grade Micronaut microservices using REST, reactive, and event-driven architectures
✓ Build reliable pagination and streaming APIs with proper ordering, backpressure, and client coordination
✓ Apply reactive principles and design patterns to achieve responsiveness, resilience, and elasticity
✓ Avoid common reactive anti-patterns such as blocking event loops or unsafe lazy loading
✓ Design event-driven systems using Event Streams and Kafka, including partitions, offsets, rebalancing, and replay
✓ Understand Kafka’s guarantees and limitations, and prevent silent data loss using correct consumer strategies
✓ Implement OpenAPI & Swagger correctly for documentation, client generation, and contract-first development
✓ Generate Micronaut servers from OpenAPI specifications and manage contract drift safely
✓ Build secure applications with Micronaut Security Session-based authentication and CSRF protection
✓ Build secure applications with Micronaut Security Stateless JWT authentication
✓ Build secure applications with Micronaut Security OAuth2 / OIDC integration with Keycloak
✓ Build secure applications with Micronaut Security Bearer, Session, and ID Token modes — and when to use each
✓ Implement logout and token revocation strategies, including immediate logout via token introspection
✓ Understand real-world JWT lifecycle management, refresh tokens, and security trade-offs
✓ Write unit, semi-integration, and full integration tests using Micronaut Test, JUnit 5, Mockito, and Reactor Test
✓ Structure tests to remain stable as systems evolve, avoiding fragile mocks and overcoupled test suites
✓ Make architecture-level decisions confidently, not just framework-level ones

Requirements
● Basic Java knowledge is required
● Knowledge of SQL and databases is helpful
● Basic MVC pattern Knowledge is helpful

Description
Students who complete the course will receive a Udemy Certificate of Completion.

This course is a deep, production-focused exploration of microservice architecture using Micronaut, designed for developers who want to go beyond framework syntax and understand why systems are designed the way they are.

While Micronaut is used as the primary implementation framework, the core architectural principles taught in this course are cross-framework and transferable. The concepts apply equally to other modern Java frameworks such as Spring Boot, Quarkus, and beyond.

You will not just learn how to use Micronaut features — you will learn when to use microservice and distributed-system features in general, when they apply across frameworks, when Micronaut-specific capabilities add value, and what trade-offs each choice introduces.

What makes this course different

Most courses focus on “how to make things work”.
This course focuses on how to make systems survive in production.

Throughout the course, we derive architecture decisions from

• system behavior under load

• failure scenarios

• data consistency and integrity

• security boundaries and trust models

• long-term maintainability

Learning reinforced through quizzes

This course includes frequent, high-quality quizzes designed to reinforce architectural reasoning, not just memorization.

The quizzes

• focus on decision-making and trade-offs, not syntax recall

• include scenario-based questions similar to real production situations

• contain explaination why an answer is correct, not just what the answer is

• are distributed throughout the course to validate understanding incrementally

These quizzes are intended to help you internalize architectural principles and confidently apply them across frameworks and real-world systems.

Micronaut is used as a concrete, efficient vehicle to demonstrate these ideas, not as the goal itself.

What you will actually learn

You will learn to design production-grade microservices that

• behave predictably under load

• scale without hidden bottlenecks

• fail safely instead of silently

• remain testable as they evolve

• enforce security correctly, not accidentally

You will understand

• imperative vs reactive architectures and when each is appropriate

• reliable pagination, streaming, and backpressure

• event-driven systems and Kafka’s real guarantees (and limitations)

• contract-first API design using OpenAPI

• security models including session-based auth, JWT, OAuth2, and OIDC

• token lifecycle management, logout semantics, and revocation strategies

• testing strategies that align with system boundaries, not mocks

Framework-agnostic architecture principles

Even though examples are implemented in Micronaut, this course explicitly teaches

• architecture patterns that apply across frameworks

• failure modes that exist regardless of technology choice

• design constraints imposed by distributed systems, not libraries

• security trade-offs that every backend stack must handle

By the end of the course, you will be able to evaluate frameworks instead of being constrained by them.

Who this course is for
■[Beginner – Intermediate – Expert] Spring, Quarkus, Micronaut, and other microservice Tech Leads or Developers who want to update, strengthen, or enrich their knowledge specifically in Micronaut and microservice architectures.
■[Beginner – Intermediate – Expert] Microservices Solution Architects who want to explore different perspectives for implementation strategies, design trade-offs, and medium-scale capabilities within Micronaut.
■[Beginner – Intermediate – Expert] IT Managers who want to understand how and why we validate, secure, and test microservice-based products — enabling better communication and alignment with Tech Leads and Development teams.

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