<appender name="SIFT" class="ch.qos.logback.classic.sift.SiftingAppender">

        <discriminator class="com.hotwaxmedia.logger.ThreadNameBasedDiscriminator"/>

        <sift>

            <appender class="ch.qos.logback.core.FileAppender">

                <file>runtime/logs/app-${threadName}.html</file>

                <layout class="ch.qos.logback.classic.PatternLayout">

                    <pattern>&lt;div class=&quot;%p&quot;&gt;%d \(${threadName}\) [%logger{0} : %-5level] %msg%n%rEx&lt;/div&gt;</pattern>

                </layout>

            </appender>

        </sift>

    </appender>

please help.

Thanx and regards 

praveen