0

I have a Client and Server class. There is one Client instance running and eight Server instances running at the same time in the same JVM.

I now wish to (programatically or through properties file) setup log4j so that I'd have one log file per class instance. For the example above I'd like to have 9 separate log files.

Improve this question
4
  • Why do you run them in the same VM?
    – user647772
    Commented Jul 24, 2012 at 8:33
  • You're probably not going to like this, but it seems you are using logging for debugging purposes, which is an antipattern. Better write automated tests.
    – Christian Schlichtherle
    Commented Jul 24, 2012 at 8:41
  • I'm currently trying to pinpoint the location where the problem occurs, before I actually go debugging. The funny thing is that I'm actually debugging a unit test... @ChristianSchlichtherle What I'm doing feels wrong. Can you perchance point me to some resource on this antipattern?
    – Howie
    Commented Jul 24, 2012 at 9:44
  • Well, it was a general comment - no offense intended. But rather than adding logging statements, I would write a unit test which tests for multithreading. There are plenty of resources on the web about writing unit tests, so you sure find some good tutorials.
    – Christian Schlichtherle
    Commented Jul 24, 2012 at 10:58

1 Answer 1

Reset to default
1

If you are using the same Logger for all the instances (v.g., private static final Logger log = Logger.getLogger(MyClass.class), all logs will follow the same process.

You should define the logger as an instance attribute and setup a different behavior for each one in the log4j.properties, v.g.

private final Logger log;

public MyClass(String instanceID) {
  this.log = Logger.getLogger(MyClass.class.toString() + "_" + instanceID);
}
Improve this answer

Not the answer you're looking for? Browse other questions tagged or ask your own question.