STEP1: Add slf4fx to you Flex3 applicationWe will write our sample application that generates some log records on button click. <?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()">
<mx:Script><![CDATA[
import mx.logging.LogEventLevel;
import org.room13.slf4fx.Slf4FxLoggingTarget;
import mx.logging.Log;
import mx.logging.ILogger;
private var _log : ILogger = Log.getLogger("org.room13.slf4fx.MyApplication");
private function init() : void {
Log.addTarget(new Slf4FxLoggingTarget("myApplication", "mySecret"));
}
private function generateLogRecords() : void {
_log.debug("level={0} {1}", LogEventLevel.DEBUG, "**DEBUG**");
_log.info("level={0} {1}", LogEventLevel.INFO, "**INFO**");
_log.warn("level={0} {1}", LogEventLevel.WARN, "**WARN**");
_log.error("level={0} {1}", LogEventLevel.ERROR, "**ERROR**");
_log.fatal("level={0} {1}", LogEventLevel.FATAL, "**FATAL**");
}
]]></mx:Script>
<mx:Button label="Generate log records" x="20" y="20" click="generateLogRecords()"/>
</mx:Application>Don't forget to compile application :D STEP2: Start provided simple SLF4Fx serverjava -jar slf4fx-server-deps.jar STEP3: Start your applicationIn our case we start sample application in browser. 
STEP4: Watch the log01:06:27.883 DEBUG MyApplication : level=2 **DEBUG**
01:06:27.890 INFO MyApplication : level=4 **INFO**
01:06:27.890 WARN MyApplication : level=6 **WARN**
01:06:27.891 ERROR MyApplication : level=8 **ERROR**
01:06:27.891 ERROR MyApplication : level=1000 **FATAL**
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