@Slf4j
@Service
public class LoggerDownloadService {

    public void printAppenders() throws IOException {
        LoggerContext context = (LoggerContext) StaticLoggerBinder.getSingleton()
                .getLoggerFactory();
        for (Logger logger : context.getLoggerList()) {
            for (Iterator<Appender<ILoggingEvent>> index = logger.iteratorForAppenders(); index.hasNext(); ) {
                Appender<ILoggingEvent> appender = index.next();
                log.info("Appender NAME: {}", appender.getName());

                ConsoleAppender<ILoggingEvent> consoleAppender = (ConsoleAppender) appender;
                ConsoleTarget consoleTarget = ConsoleTarget.findByName(consoleAppender.getTarget());
                try (FileOutputStream fos = new FileOutputStream("test.log")) {
                    ByteArrayOutputStream byteArrayOutputStream = (ByteArrayOutputStream) consoleTarget.getStream();
                    byteArrayOutputStream.writeTo(fos);
                }
            }
        }

        log.info("FINISH!!!");
    }


}

ByteArrayOutputStream byteArrayOutputStream = (ByteArrayOutputStream) consoleTarget.getStream();

java.lang.ClassCastException: ch.qos.logback.core.joran.spi.ConsoleTarget$1 cannot be cast to java.io.ByteArrayOutputStream