Logging

As you probably already saw, Krobot uses a logging engine. What is logging ? It's the art of doing System.out.print, like this :

[22:17:10] [DEBUG] [Command] Parsing command call for -> /clear

Krobot uses Apache Log4J as logging engine. It already has a bundled config for it. You should always use logging instead of System.out.print.

How to use it

In each class you want to use a logger, you need to create a private constant instance :

import org.apache.logging.log4j.LogManager; // Choose the right imports
import org.apache.logging.log4j.Logger;

private static final Logger LOGGER = LogManager.getLogger(YourClass.class);

This will create a logger called "YourClass", but you can also put a String as name.

Then you can use different functions, depending on the information to print :

• fatal => Fatal errors
• error => Errors
• warn => Warnings
• info => Main infos
• debug => Debug infos
• trace => Low level infos

They are classed by importance. Krobot is configured to print only debug or greater.

Example :

public static final String VERSION = "1.0.0";
private static final Logger LOGGER = LogManager.getLogger(MyBot.class);

LOGGER.info("Bot v{} initialized !", VERSION);

Prints :

[20:01:05] [INFO ] [MyBot] Bot v1.0.0 initialized !

Log functions can take a lot of parameters, like throwable by example, and it support formatting. Log4J is a very complete logging engine, so you can look at the official documentation if you want to go further !