Logback to log different messages to two files

Question

It's very possible to do something like this in logback. Here's an example configuration:

<?xml version="1.0"?>
<configuration>
    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
        <file>logfile.log</file>
        <append>true</append>
        <encoder>
            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>
    <appender name="ANALYTICS-FILE" class="ch.qos.logback.core.FileAppender">
        <file>analytics.log</file>
        <append>true</append>
        <encoder>
            <pattern>%-4relative [%thread] %-5level %logger{35} - %msg %n</pattern>
        </encoder>
    </appender>
    <!-- additivity=false ensures analytics data only goes to the analytics log -->
    <logger name="analytics" level="DEBUG" additivity="false">
        <appender-ref ref="ANALYTICS-FILE"/>
    </logger>
    <root>
        <appender-ref ref="FILE"/>
    </root>
</configuration>

Then you'd setup two separate loggers, one for everything and one to log analytics data like so:

Logger analytics = LoggerFactory.getLogger("analytics");

You can have as many loggers as you wish. But, it's better you have one for each package that you need to log differently. Then all the classes in that package and its sub-packages will get the that specific logger. They all can share the root logger and send their log data to root logger appender using additivity="true". Here's an example:

<?xml version="1.0" encoding="UTF-8"?>
<configuration>

<property name="pattern" value="%date{HH:mm:ss.SSS} %-5p %logger{36} 
%X{akkaSource} [%file:%line] - %m%n" />

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
    <encoder>
        <pattern>%date{HH:mm:ss.SSS} %-5p %logger{36} %X{akkaSource} [%file:%line] - %m%n</pattern>
    </encoder>
</appender>

<appender name="abc" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${catalina.base}/logs/worker.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <fileNamePattern>${catalina.base}/logs/worker-%d{yyyy-MM-dd_HH}.log</fileNamePattern>
        <maxHistory>360</maxHistory>
    </rollingPolicy>
    <encoder>
        <pattern>${pattern}</pattern>
    </encoder>
</appender>

<appender name="xyz" class="ch.qos.logback.core.rolling.RollingFileAppender">
    <file>${catalina.base}/logs/transformer.log</file>
    <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
        <fileNamePattern>${catalina.base}/logs/transformer-%d{yyyy-MM-dd_HH}.log</fileNamePattern>
        <maxHistory>360</maxHistory>
    </rollingPolicy>
    <encoder>
        <pattern>${pattern}</pattern>
    </encoder>
</appender>

<logger name="com.xxx.yyy.zzz" level="INFO" additivity="true">
    <appender-ref ref="xyz"/>
</logger>

<logger name="com.aaa.bbb.ccc" level="INFO" additivity="true">
    <appender-ref ref="abc"/>
</logger>

<root>
    <level value="INFO" />
    <appender-ref ref="STDOUT" />
</root>

in my case I wanted to leave class names as log name

private static final Logger log = LoggerFactory.getLogger(ScheduledPost.class);

and as I had few such classes, so my logback.xml

<!--additivity=false ensures this log data only goes to the this log, and no one more -->
<logger name="xxx.xxx.xxx.ScheduledPost" level="DEBUG" additivity="false">
    <appender-ref ref="ASYNC_SCHEDULE_LOG_FILE"/>
</logger>
<logger name="xxx.xxx.xxx.GcmPost" level="DEBUG" additivity="false">
    <appender-ref ref="ASYNC_SCHEDULE_LOG_FILE"/>
</logger>
<logger name="xxx.xxx.xxx.PushUtils" level="DEBUG" additivity="false">
    <appender-ref ref="ASYNC_SCHEDULE_LOG_FILE"/>
</logger>