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copied!<p>Once you programmatically configure your appender, you need invoke its <code>start()</code> method. If the appender has sub-components, invoke <code>start()</code> on the sub-components first. You then add the appender to the logger of your choice.</p> <p>Here is an example:</p> <pre><code>import ch.qos.logback.classic.Logger; import ch.qos.logback.classic.encoder.PatternLayoutEncoder; import ch.qos.logback.core.rolling.FixedWindowRollingPolicy; import ch.qos.logback.core.rolling.RollingFileAppender; import ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy; import ch.qos.logback.core.util.StatusPrinter; import org.slf4j.LoggerFactory; import ch.qos.logback.classic.LoggerContext; public class Main { public static void main(String[] args) { LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory(); RollingFileAppender rfAppender = new RollingFileAppender(); rfAppender.setContext(loggerContext); rfAppender.setFile("testFile.log"); FixedWindowRollingPolicy rollingPolicy = new FixedWindowRollingPolicy(); rollingPolicy.setContext(loggerContext); // rolling policies need to know their parent // it's one of the rare cases, where a sub-component knows about its parent rollingPolicy.setParent(rfAppender); rollingPolicy.setFileNamePattern("testFile.%i.log.zip"); rollingPolicy.start(); SizeBasedTriggeringPolicy triggeringPolicy = new ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy(); triggeringPolicy.setMaxFileSize("5MB"); triggeringPolicy.start(); PatternLayoutEncoder encoder = new PatternLayoutEncoder(); encoder.setContext(loggerContext); encoder.setPattern("%-4relative [%thread] %-5level %logger{35} - %msg%n"); encoder.start(); rfAppender.setEncoder(encoder); rfAppender.setRollingPolicy(rollingPolicy); rfAppender.setTriggeringPolicy(triggeringPolicy); rfAppender.start(); // attach the rolling file appender to the logger of your choice Logger logbackLogger = loggerContext.getLogger("Main"); logbackLogger.addAppender(rfAppender); // OPTIONAL: print logback internal status messages StatusPrinter.print(loggerContext); // log something logbackLogger.debug("hello"); } } </code></pre> <p>The above code is the programmatic expression of the steps taken by the logback's XML configurator, i.e. Joran, when it parses the <a href="https://github.com/qos-ch/logback/blob/master/logback-examples/src/main/resources/chapters/appenders/conf/logback-RollingFixedWindow.xml" rel="noreferrer">RollingFixedWindow.xml</a> file. </p>

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