Log4j create a file for each logger - log4j

Question

I have a lot of selenium tests that create a logger per class, it might not be the best way but it's code written by somebody else and I dont have time to rewrite it. I would like each Test of have it's own logfile so that it's easier to see what went wrong.
Is there a way to have log4j create a file for each logger that is created?

Answer 1

Yes, you can do this with log4j1 but I believe the only way is through programmatically adding the file appender to the logger.
Here is some sample code:
package test;
import org.apache.log4j.Appender;
import org.apache.log4j.FileAppender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
public class Main {
private static final Logger logger = Logger.getLogger(Main.class);
private static final Logger logFoo = Logger.getLogger("test.Foo");
private static final Logger logBar = Logger.getLogger("test.Bar");
public static void main(String[] args) {
logger.addAppender(createFileAppender("logs/main.log"));
logFoo.addAppender(createFileAppender("logs/foo.log"));
logBar.addAppender(createFileAppender("logs/bar.log"));
logger.info("This is the main logger");
logFoo.info("this is the foo logger");
logBar.info("This is the bar logger");
}
private static Appender createFileAppender(String logName) {
FileAppender fa = new FileAppender();
fa.setName("FileLogger");
fa.setFile(logName);
fa.setLayout(new PatternLayout("%d %-5p [%c{1}] %m%n"));
fa.setThreshold(Level.DEBUG);
fa.setAppend(true);
fa.activateOptions();
return fa;
}
}
Here is a sample log4j.xml config file:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/'>
<appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
<layout class="org.apache.log4j.PatternLayout">
<param name="ConversionPattern" value="%d %-5p [%c{1}] %m %n" />
</layout>
</appender>
<logger name="test" additivity="false">
<level value="DEBUG" />
<appender-ref ref="consoleAppender" />
</logger>
</log4j:configuration>
Note that you probably don't need to specify the console appender, I did it just to make sure things were working. You may not even need to specify any loggers, but I didn't test with that configuration.
The output of the above is 3 log files each containing the one message that was provided to the corresponding logger, and console output of all log messages.