Find actual opened logfile with JDK Logging

Question

I saw Java Logging - where is my log file?, but in my case I would like to find out in my Java application which logfile the FileHandler actually opened, i.e. if I start multiple processes and have a pattern set as

java.util.logging.FileHandler.pattern=MyApp.%g.%u.log

Then the %g and %u will be replaced with numbers depending on how many processes are running.

I can iterate over all logging Handlers and find the File-based one. But as far as I see there is no method in FileHandler to get the currently opened file.

Is there a way I can do this?

Answer 1

Yes, you can break the private protection of the field using reflection. See this question: How do I read a private field in Java?

The next option is to override the class and write your own handler which exposes this field.

The last option is to use a different logging framework like logback or log4j2. Writing your own appender for them would be more simple than for JUL.