Log4j & filtering

[Patrizio.Ferlito]

Ciao,

I'm trying to using filtering in my very simple app.

Follow my java class test:
------------------------------------------------------
package test.log4j;

import org.apache.log4j.Logger;

class MyException extends Exception
{
        public MyException(String msg)
        {
                super(msg);
        }
}

public class TestLog4j
{
        public static void main(String[] args)
        {
                Logger logger = Logger.getLogger(TestLog4j.class);

                logger.info("info - main");
                logger.debug("debug - main");
                logger.warn("warn - main");

                logger.error("error - main");
                logger.fatal("fatal - main");

                MyException ex1 = new MyException("ex for error msg");
                MyException ex2 = new MyException("ex for fatal msg");
               
                logger.error(ex1);
                logger.fatal(ex2);
        }
}
------------------------------------------------------

Follow my log4j.properties

------------------------------------------------------
# Setup the root category
log4j.rootCategory=ERROR,errorAppender
 
# Log only messages of level specified below or above in the following
packages
log4j.category.test.log4j=DEBUG,errorAppender,infoAppender,stdout
log4j.additivity.test.log4j=false
 
# The appenders
log4j.appender.errorAppender=org.apache.log4j.RollingFileAppender
log4j.appender.errorAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.errorAppender.layout.ConversionPattern=%d %-5p [%l - %t]
%m%n
log4j.appender.errorAppender.File=C:/projects/workspace/test/log4j/error
.log
log4j.appender.errorAppender.MaxBackupIndex=10
log4j.appender.errorAppender.MaxFileSize=1000KB
#log4j.appender.errorAppender.filter=test.log4j.ErrorFilter
log4j.appender.errorAppender.filter.levelToMatch=ERROR
log4j.appender.infoAppender=org.apache.log4j.RollingFileAppender
log4j.appender.infoAppender.layout=org.apache.log4j.PatternLayout
log4j.appender.infoAppender.layout.ConversionPattern=%d %-5p [%l - %t]
%m%n
log4j.appender.infoAppender.File=C:/projects/workspace/test/log4j/info.l
og
log4j.appender.infoAppender.MaxBackupIndex=10
log4j.appender.infoAppender.MaxFileSize=1000KB
 
# The log stdout appender
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d %-5p [%l - %t] %m%n
------------------------------------------------------

I would like to split messages on two files.
For example in my app I have my logger  (linked  to TestLog4j.class) and
I would like to use only this one logger to log errors and
info/debug/warn events.
In addition I would like to have one file (info.log) that contains all
messages and another file (error.log) that contains ONLY error /fatal
messages.
In this way I can monitor only one file that contains only error /fatal
messages and avoid to filtering messages not critical.
The info log file is also available for developers in order to trace
what application is doing.
I could accomplish this need in a simple way istantiating 2 loggers:
 
  Logger logger      = Logger.getLogger("info."  + TestLog4j.class);
  Logger errorLogger = Logger.getLogger("error." + TestLog4j.class);
...

  Logger logger      = Logger.getLogger("info."  + AnotherClass.class);
  Logger errorLogger = Logger.getLogger("error." + AnotherClass.class);
 
and then
 
  logger.info(...) or .debug(...) etc.
  errorLogger.error(...) or errorLogger.fatal(...)
 
but in this way I've to duplicate the categories and, in the source, to
remeber to call the correct logger according to level of the event.
So I'm trying to understand if I can use filtering to accomplish my need
and if this way is the correct solution to my problem.
 
I thank you in advance
Best regards
Patrizio