[ACCEPTED]-How do I make log4j clear a log at startup?-log4j
If you set the append parameter to false, the base 4 log file will be "started fresh" when the 3 application restarts. Do you mean that you 2 want any "rolled" log files to be deleted 1 too?
I've written some custom code to find my 17 RollingFileAppender (which is unnecessarily difficult to get 16 access to in log4j!) which I then cause 15 to roll over. I've adapted my code below 14 for a single use. I use code similar to 13 this at application startup to force my 12 logs to roll (if non-empty) so I always 11 start in a fresh log but never delete any 10 log but the oldest.
This code takes a given 9 Logger and loops up the logger hierarchy 8 until it finds a Logger that has Appenders 7 attached. If it never does, then it gives 6 up. If it does, it loops over all Appenders 5 attached to that Logger and for each one 4 that is a RollingFileAppender, it forces 3 the log to roll.
Something like this should be 2 a lot easier to do in log4j, but I haven't 1 found a simpler way of doing it.
public void rollLogFile(Logger logger) {
while (logger != null && !logger.getAllAppenders().hasMoreElements()) {
logger = (Logger)logger.getParent();
}
if (logger == null) {
return;
}
for (Enumeration e2 = logger.getAllAppenders(); e2.hasMoreElements();) {
final Appender appender = (Appender)e2.nextElement();
if (appender instanceof RollingFileAppender) {
final RollingFileAppender rfa = (RollingFileAppender)appender;
final File logFile = new File(rfa.getFile());
if (logFile.length() > 0) {
rfa.rollOver();
}
}
}
}
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