Line number not showing?

Question

I have discovered some issues in my program.
I was using log4j for logging,
however, inside the log file, all line number become "?".

The conversation pattern is as follow:

log4j.appender.file.layout.ConversionPattern=%d{dd/MM/yyyy HH:mm:ss,SSS} %5p %c: %L - %m%n

Answer 1

You are most probably missing debug information in your compiled artifacts. I.e. it is not log4j's fault, you need to make sure you are compiling your stuff with debug information included. A quick test would be to try and debug your app with your favourite IDE. If there is no debug info it will complain and won't establish debug session...

Answer 2

Set the options debug="true" debuglevel="lines,source" in your javac ant-task.