protected Logger initLogger(String fileStr) throws IOException {
RollingPolicy rollingPolicy = initRollingPolicy(fileStr, getMaxLogBackupFiles(), getMaxLogFileSize());
RollingFileAppender appender = buildAppender(buildEncoder(), rollingPolicy);
rollingPolicy.start();
appender.start();
// configure the logger for info and add the appender
return getAndConfigureLogger(appender);
}