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Java / Micronaut Interview questions

What are the key features of Micronaut?

Micronaut's defining features all stem from doing work at build time instead of runtime.

  • Compile-time dependency injection - beans and their wiring are resolved by an annotation processor, not reflection.
  • Fast startup and low memory footprint - because there's no classpath scanning at boot.
  • Built-in HTTP server/client - reactive, non-blocking, built on Netty.
  • Cloud-native tooling - service discovery, distributed configuration, and client-side load balancing out of the box.
  • Micronaut Data - compile-time generated repository implementations with no runtime proxies.
  • GraalVM native image support - designed from the ground up to compile cleanly to native binaries.
  • Polyglot - works with Java, Kotlin, and Groovy.

Together these make Micronaut a strong fit for microservices, serverless functions, and CLI tools where startup time and memory matter.

Which capability is generated at compile time rather than resolved through reflection?
Micronaut's built-in HTTP layer is built on top of:

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