Is it possible to find logback log files programmatically?

Question

It would be useful to automatically attach log files to support emails. I could set the path programmatically (as in Setting Logback Appender path programmatically), but I'd prefer to let users configure logging in the familiar way via logback.xml. So, can I find the files logback uses for logging?

Sorry but I fail to understand the question. Could you expand a bit? — Ceki, Aug 15 '11 at 22:50
@Ceki: more generally, can I get a list of all appenders used by Logback? — Alexey Romanov, Aug 16 '11 at 06:54

score 36 · Accepted Answer · answered Aug 24 '11 at 15:04

36

You can get the list of all appenders in a certain context. To do this:

LoggerContext context = (LoggerContext)LoggerFactory.getILoggerFactory();
for (Logger logger : context.getLoggerList()) {
        for (Iterator<Appender<ILoggingEvent>> index = logger.iteratorForAppenders(); index.hasNext();) {
            Appender<ILoggingEvent> appender = index.next();
        }
    }

This iterates over the list of all appenders in all loggers for the current context.

answered Aug 24 '11 at 15:04

tafoo85

869
8
12

1

iteratorForAppenders method doesn't exist any more on logger (http://www.slf4j.org/apidocs/org/slf4j/Logger.html). Any idea how it works now? – user3885927 Jul 26 '16 at 00:13
2

@user3885927 make sure you're importing ch.qos.logback.classic.Logger and not org.slf4j.Logger ! – Catchwa Feb 21 '17 at 03:43

score 24 · Answer 2 · answered Aug 07 '15 at 10:37

Answer given by @tafoo85 is correct one but it will give you appenders only.

To more specific get file used by Logback logger i hope below code will help some one.

File clientLogFile;
FileAppender<?> fileAppender = null;
LoggerContext context = (LoggerContext)LoggerFactory.getILoggerFactory();
for (Logger logger : context.getLoggerList())
{
     for (Iterator<Appender<ILoggingEvent>> index = logger.iteratorForAppenders();
                 index.hasNext();)
     {
           Object enumElement = index.next();
           if (enumElement instanceof FileAppender) {
                fileAppender=(FileAppender<?>)enumElement;
           }
     }
}

if (fileAppender != null) {
     clientLogFile=new File(fileAppender.getFile());
}
else {
     clientLogFile = null;
}

Log.d("logfile path", clientLogFile.getAbsolutePath());

Was exactly what I needed, though I changed the line `Object enumElement = index.next();` to `Appender enumElement= index.next();` as well as `fileAppender = (FileAppender>) enumElement;` to `fileAppender = (FileAppender) enumElement;` to make it work for me. — daniel.kahlenberg, Oct 13 '15 at 12:08
@danial that will be more specific. but if you want 2-3 file logger (debug and trace) then this code will work perfectly. — Wasim K. Memon, Oct 14 '15 at 05:14

score 3 · Answer 3 · answered May 25 '18 at 14:54

You can get the actual file like so:

    LoggerContext context = (LoggerContext)LoggerFactory.getILoggerFactory();

    for (ch.qos.logback.classic.Logger logger : context.getLoggerList()) {
        for (Iterator<Appender<ILoggingEvent>> index = logger.iteratorForAppenders(); index.hasNext();) {
            Appender<ILoggingEvent> appender = index.next();

            if (appender instanceof FileAppender) {
                FileAppender<ILoggingEvent> fa = (FileAppender<ILoggingEvent>)appender;
                ResilientFileOutputStream rfos = (ResilientFileOutputStream)fa.getOutputStream();
                File file = rfos.getFile();

                System.out.println(file.getAbsolutePath());
            }
        }
    }

Is it possible to find logback log files programmatically?

3 Answers3

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