Here is an example of using the ReconfigureOnChangeFilter class from the logback.classic.filter package in Java:

import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.core.ConsoleAppender;
import ch.qos.logback.core.filter.ReconfigureOnChangeFilter;

public class Example {
    public static void main(String[] args) {
        LoggerContext context = new LoggerContext();
        Logger rootLogger = context.getLogger(Logger.ROOT_LOGGER_NAME);

        // Create a pattern layout
        PatternLayoutEncoder encoder = new PatternLayoutEncoder();
        encoder.setContext(context);
        encoder.setPattern("%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n");
        encoder.start();

        // Create a console appender
        ConsoleAppender<ILoggingEvent> appender = new ConsoleAppender<>();
        appender.setContext(context);
        appender.setEncoder(encoder);

        // Create a reconfigure on change filter
        ReconfigureOnChangeFilter filter = new ReconfigureOnChangeFilter();
        filter.setContext(context);
        filter.setRefreshPeriod(2);
        filter.start();
        appender.addFilter(filter);

        appender.start();

        // Attach the appender to the root logger
        rootLogger.addAppender(appender);

        // Log some messages
        rootLogger.debug("Debug message");
        rootLogger.info("Info message");
        rootLogger.warn("Warning message");
        rootLogger.error("Error message");

        // Simulate a change in the logback configuration
        // by modifying a property in the context
        context.putProperty("level", "ERROR");
        filter.setRefreshPeriod(2);
        filter.start();
    }
}

The ReconfigureOnChangeFilter is a filter that checks for changes in the logback configuration and automatically reconfigures the logger context if a change is detected. In this example, we set the refresh period of the filter to 2 seconds, so it will check for changes every 2 seconds.

In this example, We start the filter after adding it to the appender, and then log some messages using the root logger. After that, we simulate a change in the logback configuration by setting a context property named level to ERROR, the filter will detect this change and automatically reconfigure the logger context to reflect the new configuration.

You need to add logback classic and slf4j-ext library in the classpath to use this example.