How to disable log4j logging from Java code

Question

I use a legacy library that writes logs using log4j. My default log4j.properties file directs the log to the console, but in some specific functions of my main program, I would

Answer 1

You can use

Logger.getRootLogger().setLevel(Level.OFF); 

to disable any logging in java code

Answer 2

If you wanna achieve perfect silence (like for a quiet command line tool), you can always use the NullAppender.

Logger.getRootLogger().removeAllAppenders();
Logger.getRootLogger().addAppender(new NullAppender());

Answer 3

You could try TO disable it changing your log4j.properties:

log4j.rootLogger=off, stdout
#log4j.logger.ac.biu.nlp.nlp.engineml=info, logfile
#log4j.logger.org.BIU.utils.logging.ExperimentLogger=warn

...

Ref: http://logging.apache.org/log4j/1.2/apidocs/org/apache/log4j/Level.html#OFF

Answer 4

So, you have 3 loggers defined, including the root:

log4j.rootLogger=warn, stdout
log4j.logger.ac.biu.nlp.nlp.engineml=info, logfile
log4j.logger.org.BIU.utils.logging.ExperimentLogger=warn

Unfortunately, to disable them programatically, you need to specify ALL OF THEM in the code:

Logger.getLogger("ac.biu.nlp.nlp.engineml").setLevel(Level.OFF);
Logger.getLogger("org.BIU.utils.logging.ExperimentLogger").setLevel(Level.OFF);
Logger.getRootLogger().setLevel(Level.OFF);

Here's how to reset it back to what's set in the config file.

Answer 5

Add the following to your log file

log4j.logger.com.class.with.package.BasicImplementation = off, logfiledata

log4j.appender.logfiledata = ac.biu.nlp.nlp.log.BackupOlderFileAppender
log4j.appender.logfiledata.append=false
log4j.appender.logfiledata.layout = org.apache.log4j.PatternLayout
log4j.appender.logfiledata.layout.ConversionPattern = %-5p %d{HH:mm:ss} [%t]: %m%n
log4j.appender.logfiledata.File = logfiledata.log

If the above will not stop if from logging, it will at least log all the data from BasicImplementation class to a separate file.

Answer 6

Perhaps like that:

Logger.getRootLogger().shutdown();