Hi there, I tried to configure a SizeAndTimeBasedRollingPolicy programmatically (see below) Logger statisticsLogger = (Logger) LoggerFactory.getLogger("statistics"); int MAX_HISTORY = 1095; FileSize MAX_FILE_SIZE = FileSize.valueOf("250MB"); private static final String PATTERN = "%d %-5level %logger %msg%n"; LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory(); String filename = "log/"+applicationContext.serviceGroupKey()+"-statistics.log"; String rollingFilenamePattern="log/"+applicationContext.serviceGroupKey()+"statistics-%d{yyyy-MM-dd_HH}.log.gz"; PatternLayoutEncoder patternLayoutEncoder = new PatternLayoutEncoder(); patternLayoutEncoder.setPattern(PATTERN); patternLayoutEncoder.setContext(loggerContext); patternLayoutEncoder.start(); RollingFileAppender<ILoggingEvent> rollingFileAppender = new RollingFileAppender<ILoggingEvent>(); rollingFileAppender.setFile(filename); rollingFileAppender.setName("statistics"); rollingFileAppender.setEncoder(patternLayoutEncoder); rollingFileAppender.setContext(loggerContext); rollingFileAppender.setImmediateFlush(true); rollingFileAppender.setAppend(false); patternLayoutEncoder.setParent(rollingFileAppender); SizeAndTimeBasedRollingPolicy<Object> rollingFilePolicy = new SizeAndTimeBasedRollingPolicy<>(); // TimeBasedRollingPolicy<Object> rollingFilePolicy = new TimeBasedRollingPolicy<>(); rollingFilePolicy.setContext(loggerContext); rollingFilePolicy.setParent(rollingFileAppender); rollingFilePolicy.setFileNamePattern(rollingFilenamePattern); rollingFilePolicy.setMaxHistory(MAX_HISTORY); rollingFilePolicy.setMaxFileSize(MAX_FILE_SIZE); // comment out for TimeBasedRollingPolicy rollingFilePolicy.start(); rollingFileAppender.setRollingPolicy(rollingFilePolicy); rollingFileAppender.start(); statisticsLogger.addAppender(rollingFileAppender); statisticsLogger.setAdditive(false); However, no logfile is produced. If the SizeAndTimeBasedRollingPolicy is replaced by a TimeBasedRollingPolicy, everything works fine. What is my mistake. Thanks in advance - Ulrich