Java - dynamically change logging level

Question

I would like to be able to tell the JVM to stop logging certain level of messages at some point in the execution chain. At some point I want to only log messages with SEVERE level, so I was thinking of doing this:

    for(Enumeration<String> loggerNames = logManager.getLoggerNames(); loggerNames.hasMoreElements();){
        String name = loggerNames.nextElement();
        Logger nextLogger = logManager.getLogger(name);
        if(nextLogger != null)
            nextLogger.setLevel(Level.SEVERE);
    }

Is there a cleaner way to achieve the same logic i.e. set a global variable that would stop printing to log unless SEVERE? I need to distinguish between Console output (in test) and file output in live, so I could potentially set these level on the handler (console and File)?

I think you need a java logging properties files. Check this javapractices.com/topic/TopicAction.do?Id=143 — Kiran Mohan
– Kiran Mohan, Commented Dec 7, 2012 at 9:39

Bober02 · Accepted Answer · 2012-12-07 10:53:36Z

8

ANSWERING MY OWN QUESTION:

This is exactly what I needed:

Handler[] handlers =
  Logger.getLogger( "" ).getHandlers();
for ( int index = 0; index < handlers.length; index++ ) {
  handlers[index].setLevel( Level.SEVERE);
}

answered Dec 7, 2012 at 10:53

Bober02

15.4k33 gold badges101 silver badges183 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Sridhar Sarnobat Over a year ago

That worked for me too. The advantage of this pure java approach is that I can do it in groovy too, when libraries have too much logging at the default level (I'm looking at you Apache SSHD).

Olivier.Roger · Accepted Answer · 2012-12-07 10:08:02Z

2

To control you application configuration dynamically, a common way is to use JMX.

JConsole, part of the jdk, allows you to control MBeans manually but you could also access them programatically.

You can use JMX to control MBeans as described in this page.

edited Dec 7, 2012 at 10:08

answered Dec 7, 2012 at 10:00

Olivier.Roger

4,2297 gold badges44 silver badges70 bronze badges

Comments

Taher A. Ghaleb · Accepted Answer · 2018-12-25 19:42:49Z

0

With log4j you can change the level of the root logger.

This may work:

logManager.getLogger( "" ).setLevel(Level.SEVERE);

or use Logger.getParent() to find the root logger

edited Dec 25, 2018 at 19:42

Taher A. Ghaleb

5,2805 gold badges33 silver badges47 bronze badges

answered Dec 7, 2012 at 10:41

opi

2442 silver badges9 bronze badges

Collectives™ on Stack Overflow

Java - dynamically change logging level

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

1 Comment

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related