Warning
This plugin is from Minecraft Beta around 2010 for the PilzBros Network. It was created by the developer while they were in High School. It's no longer maintained and last ran on MC 1.6+. It's being published here for historical purposes. The code quality, quite frankly, is abysmal. Don't code like this.
This is a lightweight Minecraft plugin that fires fireworks when a player joins the server.
psj.firework- Launch firework on user login