Stop editing JAVA_HOME

jfs (Java Fucking Sucks) is a Windows Java version manager. Point it at JDKs you already have, then switch with one command. Your actual JAVA_HOME environment variable stays unchanged. Behind the scenes, a directory junction moves. No shims, no shell hooks, no background service.

irm https://jfs.acdev.app/install.ps1 | iex

1. Install once The script puts jfs.exe in %LOCALAPPDATA%\jfs\bin, sets your user JAVA_HOME to %LOCALAPPDATA%\jfs\current, and adds that bin plus %JAVA_HOME%\bin to your user PATH.

2. Register local JDKs jfs does not download Java. jfs add 21 "C:\path\to\jdk" checks for bin\java.exe and records the path.

3. Switch jfs use 21 retargets the current junction. New java processes follow it. Open terminals do not need a hook.

Commands

Command	What it does
jfs list	Show registered JDKs. The active one is marked with *.
jfs add <name> <path>	Register a local JDK directory.
jfs use <name>	Point the current junction at that JDK.
jfs current	Print the active version name.
jfs rm <name>	Forget a version. Files on disk stay. The active version cannot be removed.

Where state lives

%LOCALAPPDATA%\jfs\
  config.json     registry of names and paths
  current         NTFS junction to the active JDK
  bin\jfs.exe     the program