Can Java cold-start?

A JavaSE based HTTP service

In this installment of the series we are using examples created using just JavaSE APIs to cold start a HTTP server.

If you want to run the experiment yourself you can download the example.tar.gz file.

Example	Process start	Process ready	Process total
Example 1 - JShell	541 ms	12 ms	553 ms
Example 2 - JAR file	76 ms	31 ms	107 ms
Example 3 - .class files	72 ms	30 ms	102 ms
Example 4 - JShell (Docker)	988 ms	12 ms	1000 ms
Example 5 - JAR file (Docker)	574 ms	22 ms	596 ms

These numbers were collected on a Mac Mini M1 with 16GB using Java 17

Process start - the amount of time it takes before the JVM is executing your code.
Process ready time - the amount of time it takes for the HTTP server to be ready for processing.
Process total - the total time (process start + process ready).

If you have any comments, suggestions or concerns, please start a discussion on GitHub.

Posted October 15th, 2021