The short version
A browser extension that runs legacy Java applets through WebAssembly.
From the HackerLinks archive
CheerpJ Applet Runner
A browser extension that runs legacy Java applets through WebAssembly.
At a glance:
First seen:2026-07-12
Last seen:2026-07-12
Times seen:1
Website:cheerpj.com
Why it caught our attention
It preserves old educational software without requiring a full rewrite.
Where it surfaced on Hacker News
2026-07-12
Editorial paraphrase
A commenter highlighted it as a longstanding solution for running educational Java applets in modern browsers.
Original threadOld and new apps, via modern coding agents