Hi everyone 

I am setting two variable in MDC and then in my appender in file tag i gave two variable ${configId} and ${threadName}. but when i run it i get only threadName value and for ${configId} it shows configId is UNDEFIND. but when the mdc context i found it is in the context, then why it giving error.

<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/DataManagerLog/${configId}-${threadName}.html</file>
                <layout class="ch.qos.logback.classic.PatternLayout">
                    <pattern>&lt;div class=&quot;%p&quot;&gt;%d \(${threadName} -%X{configId}\) [%logger{0} : %-5level] %msg%n%rEx&lt;/div&gt;</pattern>
                </layout>
            </appender>
        </sift>
    </appender>

please help.

Praveen