Logging

Add a logger with the following dependencies:

MavenKotlin Gradle

<dependencies>
    ...

    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-api</artifactId>
        <version>SLF4J_VERSION</version>
    </dependency>
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>LOGBACK_VERSION</version>
    </dependency>
</dependencies>

repositories {
    ...
    mavenCentral()
}

dependencies {
    ...

    implementation("org.slf4j:slf4j-api:SLF4J_VERSION")
    implementation("ch.qos.logback:logback-classic:LOGBACK_VERSION")
}

Here are the logback configs I recommend using:

Dev configProd config

I would recommend putting it in your project, in a folder containing your config files, and load it as such:

Danger

Just like any sensitive data, make sure to add the folder to your .gitignore, as it will contain much more than just the logback config.

However, you can provide a template for contributors/other users.

KotlinJava

System.setProperty(ClassicConstants.CONFIG_FILE_PROPERTY, PATH_TO_LOGBACK.absolutePathString())

System.setProperty(ClassicConstants.CONFIG_FILE_PROPERTY, PATH_TO_LOGBACK.toAbsolutePath().toString());

logback-test.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true"> <!-- Reloads every minute -->
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} %boldCyan(%-26.-26thread) %boldYellow(%-20.-20logger{0}) %highlight(%-6level) %msg%n%throwable</pattern>
        </encoder>
    </appender>

    <!-- JDA -->
    <logger name="net.dv8tion.jda" level="info"/>

    <!-- HikariCP -->
    <logger name="com.zaxxer.hikari" level="info"/>

    <!-- Flyway -->
    <logger name="org.flywaydb" level="warn"/>

    <!-- BotCommands -->
    <logger name="io.github.freya022.botcommands" level="debug"/>

    <!-- Other logs -->
    <root level="info">
        <appender-ref ref="STDOUT"/>
    </root>
</configuration>

I would recommend putting it in a folder next to the bot's JAR, and load it as such:

KotlinJava

System.setProperty(ClassicConstants.CONFIG_FILE_PROPERTY, PATH_TO_LOGBACK.absolutePathString())

System.setProperty(ClassicConstants.CONFIG_FILE_PROPERTY, PATH_TO_LOGBACK.toAbsolutePath().toString());

logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration scan="true"> <!-- Reloads every minute -->
    <timestamp key="bySecond" datePattern="yyyyMMdd'T'HHmmss"/>

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} %boldCyan(%-26.-26thread) %boldYellow(%-20.-20logger{0}) %highlight(%-6level) %msg%n%throwable</pattern>
        </encoder>
    </appender>

    <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <file>logs/latest.log</file>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <!-- daily rollover -->
            <fileNamePattern>logs/logs-%d{yyyy-MM-dd}.log</fileNamePattern>

            <!-- keep 90 days worth of history capped at 3GB total size -->
            <maxHistory>90</maxHistory>
            <totalSizeCap>3GB</totalSizeCap>
        </rollingPolicy>

        <encoder>
            <pattern>%d{HH:mm:ss.SSS} %-26.-26thread %-36.-36class{36} #%-24.-24method{24} L%-5.-5line %-20.-20logger{0} %-6level %msg%n%throwable</pattern>
        </encoder>
    </appender>

    <!-- JDA -->
    <logger name="net.dv8tion.jda" level="info"/>

    <!-- HikariCP -->
    <logger name="com.zaxxer.hikari" level="info"/>

    <!-- Flyway -->
    <logger name="org.flywaydb" level="info"/>

    <!-- BotCommands -->
    <logger name="io.github.freya022.botcommands" level="debug"/>

    <!-- Other logs -->
    <root level="info">
        <appender-ref ref="STDOUT"/>
        <appender-ref ref="FILE"/>
    </root>
</configuration>