How to set mod level on commandline

[Two]

Hi,

I am trying to help a modder to pin down an issue that's happening on my system and I am trying to figure out how to set the log level of forge file logging to debug. My attempts at googling and using the usual log4j settings have failed.

I do not have access to the source code of the mod, so I need to set the log level on the command line.

Edited December 3, 2022 by Two

[ChampionAsh5357]

Basically, add '-Dforge.logging.console.level=debug -Dforge.logging.markers=REGISTRIES' to your JVM arguments in your game profile.

[Two]

Thank you, but this doesn't actually change anything about the log output. I also tried to set the file logger to debug, but again: no change in the log output.

[ChampionAsh5357]

1 hour ago, Two said:

Thank you, but this doesn't actually change anything about the log output. I also tried to set the file logger to debug, but again: no change in the log output.

Did you check the debug.log in the logs folder?

[Two]

There is no debug log in the logs folder.

[warjort]

If you are using curseforge, you need to enable the forge debug.log in its settings.

 

Otherwise, it's likely something you are doing when trying to change the log configuration is incorrect and you have broken the logging.

Since you don't say what you have actually done, it's impossible to help further.

Forge's debug logging is enabled by default, when launchers don't elect to turn it off.

Edited December 7, 2022 by warjort

[Two]

I was setting the debug defines on the commandline used to start Minecraft in the Minecraft launcher as ChampionAsh535 suggested, this had zero effect. However enabling debugging in Curseforge did it.

I have no idea what Curse is doing to suppress the commandlines, but if running with the Curseforge Launcher using that specific setting seems to be the only way to activate debug logs. Which is a bit odd, because it should listen to the commandline settings, especially if enforcing something like a log4j config file, but it is not.

Thanks for the help!

Edited December 8, 2022 by Two