# square/dagger

A fast dependency injector for Android and Java.

Repository: https://github.com/square/dagger
Canonical: https://ross.abutalabs.com/products/square-dagger
Homepage: https://square.github.io/dagger/
Language: Java
License: Apache-2.0
License Family: permissive
Archived: true
Last push: 2021-08-26T11:07:52+00:00

## Health v2 (maintenance only)
Score: 10/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 5144, "days_push": 1833, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases, archived
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 7279, forks 3081 (observed 2026-08-28T04:09:57.992872+00:00)

## What it is
Dagger 1 is a fast, reflection-free dependency injection library for Android and Java built on JSR-330 (javax.inject) annotations. It is deprecated in favor of Google's Dagger 2 and should not be adopted for new projects.

## Use cases
- inject dependencies in an Android app
- replace factory boilerplate classes in Java projects
- make classes easier to unit test with fakes
- swap modules between dev and production
- learn how Dagger 1 dependency injection worked

## When to choose
- maintaining a legacy Android or Java codebase already using Dagger 1.x
- studying the design that led to Dagger 2

## When to avoid
- starting any new Android or Java project
- you can use Google's Dagger 2 instead
- you need ongoing support or security fixes

## Facets
- artifact type: library
- maturity: abandoned
- function: developer-tools, boilerplate
- domain: mobile-development, developer-tools, android-tools
- platform: jvm
- tags: dependency-injection, jsr-330, deprecated, android

## Member repositories
- square/dagger (main) score 10

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:57.992872+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 2026-08-29T17:38:53.723613+00:00, confidence not recorded.
  - readme: https://github.com/square/dagger (fetched 2026-08-28T04:09:57.992872+00:00, sha 4780d2708e55)
  - homepage: https://square.github.io/dagger/ (fetched 2026-08-29T08:34:10.297605+00:00, sha c7849fd7d643)
- Data as of 2026-08-30T08:39:29.467469+00:00.