Sharing one encoder/pattern among multiple Appenders in Logback

Patterns are reusable with variable substitution.

<configuration>

    <property name="defaultPattern"
        value="%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n" />

    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>${defaultPattern}</pattern>
        </encoder>
    </appender>

    <root level="debug">
        <appender-ref ref="STDOUT" />
    </root>
</configuration>