Using SLF4J and Logback

1. Replace default JUL(java.util.logger) with SLF4J

some application use java.util.logger as default logging, for example: grizzly. 

document: SLF4JBridgeHandler

package: org.slf4j:jul-to-slf4j

import org.slf4j.bridge.SLF4JBridgeHandler;SLF4JBridgeHandler.removeHandlersForRootLogger();SLF4JBridgeHandler.install();

2. Use logback filter for appender

using appender's filter to unwanted log message

<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">        <filter class="ch.qos.logback.classic.filter.ThresholdFilter">            <level>WARN</level>        </filter>        <!-- encoders are assigned the type             ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->        <encoder>            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>        </encoder></appender>