java-tutorials/guest/logback-example/src/main/resources/logback.xml

<configuration debug="true">
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
        <target>System.out</target>
    </appender>

    <property name="fileName" value="file.log" />
    <property scope="context" resource="application.properties" />

    <!-- configure appenders -->
    <appender name="rollingFileAppender" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <fileNamePattern>log-%d{yyyy-MM-dd}.log</fileNamePattern>
            <maxHistory>30</maxHistory>
            <totalSizeCap>3GB</totalSizeCap>
        </rollingPolicy>
        <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy">
            <maxFileSize>3MB</maxFileSize>
        </triggeringPolicy>
        <encoder>
            <pattern>%d [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="roleSiftingAppender" class="ch.qos.logback.classic.sift.SiftingAppender">
        <discriminator>
            <key>userRole</key>
            <defaultValue>ANONYMOUS</defaultValue>
        </discriminator>
        <sift>
            <appender name="fileAppender" class="ch.qos.logback.core.FileAppender">
                <file>${userRole}.log</file>
                <layout class="ch.qos.logback.classic.PatternLayout">
                    <pattern>%d [%thread] %level %mdc %logger{50} - %msg%n</pattern>
                </layout>
            </appender>
        </sift>
    </appender>

    <!-- configure layouts -->
    <appender name="colorAppender" class="ch.qos.logback.core.ConsoleAppender">
        <encoder class="ch.qos.logback.classic.encoder.PatternLayoutEncoder">
            <pattern>%d %green([%thread]) %highlight(%level) %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="htmlAppender" class="ch.qos.logback.core.FileAppender">
        <encoder class="ch.qos.logback.core.encoder.LayoutWrappingEncoder">
            <layout class="ch.qos.logback.classic.html.HTMLLayout">
                <pattern>%thread%level%logger%msg</pattern>
            </layout>
        </encoder>
        <file>log.html</file>
    </appender>

    <!-- configure filters -->
    <appender name="STDOUT_LEVEL_FILTER_APPENDER" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
        <target>System.err</target>
    </appender>

    <appender name="STDOUT_THRESHOLD_FILTER_APPENDER" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
            <level>WARN</level>
        </filter>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>

    <appender name="STDOUT_EVALUATOR_FILTER_APPENDER" class="ch.qos.logback.core.ConsoleAppender">
        <filter class="ch.qos.logback.core.filter.EvaluatorFilter">
            <evaluator class="ch.qos.logback.classic.boolex.JaninoEventEvaluator">
                <expression>return (level > DEBUG &amp;&amp; message.toLowerCase().contains("employee"));</expression>
            </evaluator>
            <OnMismatch>DENY</OnMismatch>
            <OnMatch>NEUTRAL</OnMatch>
        </filter>
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n</pattern>
        </encoder>
    </appender>

    <!-- configure turbo filters -->
    <turboFilter class="ch.qos.logback.classic.turbo.DuplicateMessageFilter">
        <AllowedRepetitions>2</AllowedRepetitions>
    </turboFilter>

    <turboFilter class="com.stackify.logging.IgnoreLoggerFilter">
        <LoggerName>ignoredColorLogger</LoggerName>
    </turboFilter>

    <!-- configure loggers -->
    <logger level="info" name="rollingFileLogger" additivity="false">
        <appender-ref ref="rollingFileAppender" />
    </logger>
    
    <logger level="info" name="htmlLogger" additivity="false">
        <appender-ref ref="htmlAppender" />
    </logger>
    
    <logger level="info" name="roleSiftingLogger" additivity="false">
        <appender-ref ref="roleSiftingAppender" />
    </logger>
	
    <logger level="info" name="colorLogger" additivity="false">
        <appender-ref ref="colorAppender" />
    </logger>
    
    <logger level="info" name="ignoredColorLogger">
        <appender-ref ref="colorAppender" />
    </logger>
    
    <logger level="info" name="levelFilterLogger" additivity="false">
        <appender-ref ref="STDOUT_LEVEL_FILTER_APPENDER" />
    </logger>
    
    <logger level="info" name="thresholdFilterLogger" additivity="false">
        <appender-ref ref="STDOUT_THRESHOLD_FILTER_APPENDER" />
    </logger>
    
    <logger level="info" name="evaluatorFilterLogger" additivity="false">
        <appender-ref ref="STDOUT_EVALUATOR_FILTER_APPENDER" />
    </logger>
    
    <!-- configure root logger -->
    <root level="INFO">
        <appender-ref ref="STDOUT" />
    </root>
	
    <!-- configure root logger conditionally -->	
    <property scope="context" resource="application.properties" />
	
    <if condition='property("env").equals("dev")'>
        <then>
            <root level="TRACE">
                <appender-ref ref="STDOUT" />
            </root>
        </then>
    </if>

</configuration>