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Micronaut Java

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2 månader
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Micronaut is a JVM framework for microservices, optimized for cloud (startup 50ms, memory 20-50MB vs. Spring's 5s/300MB). You write controllers, services, and integrations with minimal boilerplate. Used by fintech, cloud-native teams, and serverless deployments. Senior practitioners earn 130-190k USD. Mastery takes 6-8 weeks. Spring dominates enterprise Java, but Micronaut is gaining 20% YoY (cloud migration tail wind). Teams moving to cloud + Kubernetes prefer Micronaut; jobs increasingly require it.

Vad är Micronaut Java

Micronaut is a lightweight JVM framework for building microservices. You write standard Java code: controllers (REST endpoints), services (business logic), repositories (data access). Micronaut compiles most "magic" at compile-time (not runtime), resulting in tiny, fast apps. A typical workflow: create project with mn create-app, add controller (annotated method), add service, add data layer (JPA/SQL/MongoDB), write integration tests with Testcontainers, compile to native binary with GraalVM. Deploy container or serverless function.

🔧 VERKTYG & EKOSYSTEM
Micronaut frameworkMicronaut CLIGraalVM for native compilationTestcontainers for integration testsGradle/Maven build toolsJUnit 5 testingDocker containerizationKubernetes deployment

💰 Lön per region

OmrådeNybörjareMidErfaren
USA$85k$145k$230k
UK£55k£95k£155k
EU€60k€105k€170k
CANADAC$95kC$160kC$250k

❓ Vanliga frågor

Why is Micronaut faster than Spring?
Micronaut compiles more at compile-time (instead of runtime reflection). No classpath scanning, no annotation processing overhead at startup. Trades flexibility for speed.
When should I use Micronaut vs. Spring?
Micronaut: microservices, serverless, tight resource budgets (kubernetes, edge). Spring: monoliths, large teams, stability required. Micronaut growing, Spring entrenched. Pick based on constraints.
How do I compile Micronaut to native with GraalVM?
Use `mn create-app --features=graalvm-native-image`. Build with `./gradlew nativeCompile`. Result: standalone executable, no JVM needed. Startup <100ms, memory <20MB.
Does Micronaut work with AWS Lambda?
Yes. With GraalVM native compile, cold start < 1 second. Spring cold start = 10-20 seconds, often timeout on Lambda. Micronaut is best-in-class for serverless Java.
What's the learning curve from Spring to Micronaut?
Moderate. Concepts are similar (controllers, services, DI). Syntax and configuration differ. Most Spring developers pick it up in 2-3 weeks.

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