使用相同的 appender 回退多个记录器

Question

Is that possible to get several loggers working with the same appender ? When i create a logback.xml like this one:

<?xml version="1.0" encoding="UTF-8" ?>
<configuration scan="true">
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%-18.18thread] %highlight(%-5level) %-30.30logger - %msg%n</pattern>
        </encoder>
    </appender>
    <logger name="events.A" level="trace"><appender-ref ref="STDOUT"/></logger>
    <logger name="events.B" level="trace"><appender-ref ref="STDOUT"/></logger>
    <root level="info"/>
</configuration>

But when i do:

    Logger loggerA = LoggerFactory.getLogger("events.A");
    Logger loggerB = LoggerFactory.getLogger("events.B");
    loggerA.trace("I am A");
    loggerB.trace("I am B");

It prints only "I am B".

It that a normal behaviour ? is there a way to do it ? I know i could only use "events" logger but i will have a lot of events and i would like to be able to switch log level of each events separately.

Answer 1

Having one appender with multiple loggers is not only possible but normal: in facts I usually put just one <appender-ref ref="xyz"/> tag inside the <root> tag so it is valid for all loggers. Your example works fine, so check better your real config.