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// Live runtime demo

Java Spring Boot

Not a screenshot — a real JVM running in a Docker container on private hardware, reached through a Cloudflare Tunnel. Every number below is read live from the process on each request.

Java version
Spring Boot
JVM
Uptime
Heap used
CPU cores
Live threads
Host · arch

Exercise the JVM

Compute n! exactly using java.math.BigInteger — arbitrary precision, no overflow. The work happens on the server; you get back the digit count and how long the JVM took.

n
digits in n!
computed in
first 20 digits
last 20 digits
GET /java/api/info — live responseloading…

Auto-refreshes every 5s · powered by Spring Boot on a JVM that won't be online 24/7.