# micronaut-projects/micronaut-core

Micronaut Application Framework

Repository: https://github.com/micronaut-projects/micronaut-core
Canonical: https://ross.abutalabs.com/products/micronaut-core
Homepage: http://micronaut.io
Language: Java
License: Apache-2.0
License Family: permissive
Topics: microservices, java, kotlin, groovy, cloudnative, serverless
Last push: 2026-08-26T10:58:14+00:00

## Health v2 (maintenance only)
Score: 95/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 99, release rhythm 86, longevity 100
- inputs: {"age_days": 3101, "days_push": 7, "days_rel": 12, "gap_med": 3.5, "n_releases_24m": 123}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6421, forks 1206 (observed 2026-08-28T04:09:43.333556+00:00)

## What it is
Micronaut is a modern, JVM-based full-stack framework for building modular, easily testable applications and microservices in Java, Kotlin, and Groovy. It pre-computes framework infrastructure at compile time (AOT), delivering fast startup, low memory footprint, and minimal reflection compared to reflection-based frameworks like Spring Boot.

## Use cases
- build microservices in java with fast startup and low memory
- develop serverless functions on the jvm
- create rest apis with a netty-based non-blocking http server
- replace spring boot with a compile-time dependency injection framework
- build message-driven and command-line jvm applications
- set up service discovery and distributed configuration for cloud-native apps
- generate openapi/swagger documentation for jvm services

## When to choose
- you need fast startup and low memory for microservices or serverless (e.g., GraalVM native images)
- you want a Spring Boot alternative with compile-time DI and no runtime bytecode generation
- your team works in Java, Kotlin, or Groovy on the JVM
- you need built-in cloud-native features like service discovery, distributed config, and tracing

## When to avoid
- your team is deeply invested in the Spring ecosystem and its libraries
- you need the largest possible third-party integration ecosystem or community size
- you are building a simple script or small tool where a framework is overkill
- you rely on libraries that depend heavily on runtime reflection or proxies

## Facets
- artifact type: framework
- maturity: stable
- function: web-framework, api-framework, http-server, routing, middleware, microservices, serverless, cli, configuration-management, service-discovery, tracing
- domain: web-development, backend, microservices, developer-tools, cloud-computing, apis
- platform: jvm, cross-platform, cloud, serverless
- tags: jvm, aot-compilation, dependency-injection, netty, graalvm, spring-alternative, groovy, cloud-native, openapi, docker

## Member repositories
- micronaut-projects/micronaut-core (main) score 95

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:43.333556+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T17:44:53.893637+00:00, confidence not recorded.
  - readme: https://github.com/micronaut-projects/micronaut-core (fetched 2026-08-28T04:09:43.333556+00:00, sha bbaa8d8f4573)
  - homepage: http://micronaut.io (fetched 2026-08-29T08:41:41.559061+00:00, sha 29030dc42a00)
  - site_page: https://docs.micronaut.io/index.html (fetched 2026-08-29T08:41:41.565300+00:00, sha 0b86845ab944)
  - site_page: https://micronaut.io/category/release-announcements (fetched 2026-08-29T08:41:41.561577+00:00, sha 2c508392042b)
  - site_page: https://micronaut.io/faq (fetched 2026-08-29T08:41:41.563382+00:00, sha 8ecf5581e459)
- Data as of 2026-08-30T08:39:29.467469+00:00.