logwindow

When the client launches, logwindow opens an independent Java Swing window next to the game. Log4j2 output is intercepted and displayed in that window in real time, which makes it easier to follow what the game is doing during startup and play. The window is meant for debugging, for developers who want to watch log lines and for players who need to check what happened when something goes wrong.

The line count kept in the window is capped by a setting in the client configuration file, so a long session cannot grow the log without limit. Left at its default of -1, the window keeps every line with no cap, while setting a number such as 10000 stops the log from growing until it takes up a large share of memory. The file is created in the config directory after the first launch of the game, and the mod itself is placed in the mods folder of the .minecraft directory.

The mod is a simple Forge 1.20.1 project. Only the client needs it, because it works on the local game window and does not change what a server runs. It is published for Forge only, with one version, 1.0.0 for 1.20.1. The license is Creative Commons Attribution Non Commercial Share Alike 4.0, so the code is not open source, and source code and an issue tracker are linked publicly.