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 like to disable logging altogether (from all classes).
I tried this:
Logger.getLogger(BasicImplementation.class.getName()).setLevel(Level.OFF);
where "BasicImplementation" is one of the main classes that does logging, but it didn't work - the logs are still written to the console.
Here is my log4j.properties:
log4j.rootLogger=warn, stdout
log4j.logger.ac.biu.nlp.nlp.engineml=info, logfile
log4j.logger.org.BIU.utils.logging.ExperimentLogger=warn
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = %-5p %d{HH:mm:ss} [%t]: %m%n
log4j.appender.logfile = ac.biu.nlp.nlp.log.BackupOlderFileAppender
log4j.appender.logfile.append=false
log4j.appender.logfile.layout = org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern = %-5p %d{HH:mm:ss} [%t]: %m%n
log4j.appender.logfile.File = logfile.log
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.
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());
You can use
Logger.getRootLogger().setLevel(Level.OFF);
to disable any logging in java code
在 java.util.logging.Logger 的 1.8 版中,正确的形式是:
Logger.getLogger("").setLevel(Level.OFF);
也许是这样:
Logger.getRootLogger().shutdown();
For newer log4j versions, you may consider to call:
LogManager.shutdown();
Instead of:
Logger.shutdown();
which is deprecated. But it still makes the same thing:
Calling this method will safely close and remove all appenders in all the categories including root contained in the default hierachy.
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
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.
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