How to make log4j print origin of message?

Question

Is there a way to make Log4j-outputs include the origin of the message? The following configuration via log4j.properties (which has been handed over to me...):

log4j.rootCategory=INFO, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-5p - %m%n

fails to print out the very important detail of what class is sending that message, and right now I could really need that bit on info!

Layna

Answer 1

See Conversion Pattern Layout

For example, you can use ConversionPattern=%d{ABSOLUTE} %5p %t %c{1}:%M:%L - %m%n

Answer 2

If you use the %C notation, you can see the package and the class name of the log origin.

So, you can use:

log4j.rootCategory=INFO, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-5p - %m%n - %C