# jenv/jenv

Manage your Java environment

Repository: https://github.com/jenv/jenv
Canonical: https://ross.abutalabs.com/products/jenv
Homepage: http://www.jenv.be
Language: Shell
License: MIT
License Family: permissive
Last push: 2026-02-22T09:58:28+00:00

## Health v2 (maintenance only)
Score: 67/100 (v2, computed 2026-09-03T02:39:23.370411+00:00)
- activity 68, release rhythm 47, longevity 100
- inputs: {"age_days": 4969, "days_push": 192, "days_rel": 272, "gap_med": 70.5, "n_releases_24m": 3}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 6655, forks 396 (observed 2026-08-28T04:09:47.389029+00:00)

## What it is
jEnv is a command-line tool, adapted from rbenv, for managing multiple Java JDK/JRE installations on a development machine. It lets you switch Java versions globally, per-directory, or per-shell and automatically sets JAVA_HOME.

## Use cases
- switch between java versions per project
- set JAVA_HOME automatically in my shell
- manage multiple JDKs on macOS
- use java 8 for android and java 11 for server projects
- pin a java version per directory
- list installed JDKs from the terminal

## When to choose
- you develop across projects requiring different Java versions
- you want rbenv-style version switching for Java
- you need per-directory or per-shell JAVA_HOME control

## When to avoid
- you expect it to install Java for you - it only manages already-installed JDKs
- you need Windows support
- you want a GUI JDK manager

## Facets
- artifact type: cli-tool
- maturity: active
- function: developer-tools, cli, configuration-management
- domain: developer-tools
- platform: cli
- tags: java, jdk-version-manager, java-home, shell, rbenv-inspired, environment-manager, command-line, macos, linux

## Member repositories
- jenv/jenv (main) score 67

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:09:47.389029+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 2026-08-29T17:43:03.454964+00:00, confidence not recorded.
  - readme: https://github.com/jenv/jenv (fetched 2026-08-28T04:09:47.389029+00:00, sha 8799181bcd10)
  - homepage: http://www.jenv.be (fetched 2026-08-29T08:39:16.956700+00:00, sha 9d205e945d9b)
- Data as of 2026-08-30T08:39:29.467469+00:00.