Groovy Log
Everything Groovy related has its own log, and it generates its own file. If you run into issues with your script you should look to this file first.
Location
The file is always [Minecraft instance path]/logs/groovy.log for clients and [Minecraft instance path]/logs/groovy_server.log for servers.
Interacting
There are six main ways to add messages to the log file. Each has a different purpose and level of severity.
When adding messages to the log via these methods, the time, side, log channel, currently loaded script, and currently running line will be printed to the log file.
However, if you do not want any of that information, you can use println instead of any of the other options to print the messages you provide it directly to the log file.
Debug
Called via log.debug(msg), this indicates that the information is detailed information about the system for debugging purposes and is not important for regular use.
Logging on the debug channel will not be added to the groovy.log file unless the debug option in the runConfig.json is enabled.
Info
Called via log.info(String), this indicates that the information is used to provide a record of the normal operation of the system.
Warn
Called via log.warn(String), this indicates that the information is an indication of potential issues that may lead to errors or unexpected behavior.
Error
Called via log.error(String), this indicates that the information is related to part of the script breaking and not functioning as intended.
When joining the game or reloading, any errors encountered will be added to the chat.
Fatal
Called via log.fatal(String), this indicates that the information is a severe error that will prevent the application from continuing.
Exception
Called via log.exception(Throwable), this indicates that the information is related to part of the script breaking and not functioning as intended.
Additionally, it will log the stacktrace of the Throwable, making identifying the issue significantly easier.
Debug
When the debug setting of the runConfig.json is enabled, messages logged to the debug channel will be printed to the log file.
These messages are typically things that are helpful in tracking what causes a problem, but are generally unneeded in causual use.
Additionally, when this setting is enabled, errors and exceptions will include the line numbers in their logs.
Reporting Issues
When sharing the Groovy Log, you should share the entire text of the log and that of the relevant class file as text.
Waiting Idly