Learn MICRONAUT-SECURITY with Real Code Examples

Secure REST API endpoints with JWT

Implement OAuth2 login with Google or Keycloak

Use method-level security with `@RolesAllowed`

Build custom authentication provider for LDAP

Add reactive token validation for high-throughput services

Check logs for authentication failures

Ensure JWT secret or OAuth2 client credentials are correct

Verify annotations are applied correctly

Debug token parsing and validation

Confirm configuration properties in `application.yml`

Use Micronaut Test with JUnit or Spock

Mock authentication providers for unit tests

Test endpoint access with valid and invalid tokens

Verify role-based access restrictions

Include integration tests for security flows

Deploy on JVM-based servers (AWS, GCP, Azure)

Docker containerization for microservices

Serverless deployments with AWS Lambda or Google Cloud Functions

Include secrets management for keys and tokens

Monitor security and authentication metrics in production

Micronaut framework

Micronaut Security modules (JWT, OAuth2, LDAP)

Gradle or Maven build tools

Micronaut Data for database access

Micronaut Test for unit and integration testing

OAuth2 providers: Google, Keycloak, Okta

LDAP authentication servers

JWT token-based stateless APIs

Database for user roles and permissions

Reactive or non-reactive Micronaut applications

Use annotation-based security for clarity

Leverage reactive JWT validation for performance

Centralize authentication providers for reuse

Test secured endpoints early

Monitor token lifecycles and roles for consistency

Configuring multiple authentication strategies

Integrating reactive security with non-blocking services

Managing JWT secrets and token expiration

Understanding annotation-based authorization

Scaling security across multiple microservices