Micronaut Security

In this tutorial, you'll learn about Fix Micronaut Security Not Authenticating. We cover key concepts, practical examples, and best practices.

The Problem

Micronaut Security does not protect routes or authentication fails.

Quick Fix

Add security dependency

Wrong:

<!-- No security -->

Output:

No authentication

Right:

<dependency>
  <groupId>io.micronaut.security</groupId>
  <artifactId>micronaut-security-annotations</artifactId>
</dependency>

Output:

Security enabled

Secure endpoints with @Secured

Wrong:

@Controller("/api")
public class ApiController { } // No security

Output:

All routes open

Right:

@Secured(SecurityRule.IS_AUTHENTICATED)
@Controller("/api")
public class ApiController { }

Output:

Routes require authentication

Configure JWT authentication

Wrong:

# No JWT config
micronaut.security.enabled=true

Output:

No auth provider

Right:

micronaut:
  security:
    authentication: bearer
    token:
      jwt:
        signatures:
          secret:
            generator:
              secret: "mySecretKey12345"

Output:

JWT authentication configured

Prevention

• Add micronaut-security-annotations dependency
• Annotate controllers with @Secured
• Configure authentication provider (JWT, LDAP, etc.)

Common Mistakes with security

1. Using return to exit a function early instead of wrapping a pure value in the monad
2. Mixing let bindings with <- bindings in do notation, producing type errors
3. Overlapping type class instances that cause GHC to reject the program with ambiguous dispatch errors

These mistakes appear frequently in real-world MICRONAUT code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ

This quick fix is part of the DodaTech Spring & JVM ecosystem series. Built by the developers of Doda Browser, DodaZIP, and Durga Antivirus Pro.