extend Logger Class Log4J

[Arvindu]

I want to extend Logger Class like MyLogger

and add new Level like Trace

How to make the MyLogger.getLogger
to return MyLogger instance

MyLogger must extend Logger

Thanks in advance

[Pavan Panduga]

Arvind,

If you want to define custom levels like TRACE, you could do this by writing a class which extends org.apache.log4j.Level.

there's an example,XLevel, in the log4j distribution. This is a subclass of Level and adds TRACE, LETHAL.

After writing a custom level class, there are two steps to follow. Configure this new calss, and fire custom log events.

1.Configuration
since, DEBUG is the default level, in order to print levels less than DEBUG should be configured.
my sample config file looks like this:

  
log4j.rootLogger=TRACE#customlevel.XLevel, STDOUT
 
log4j.appender.STDOUT=org.apache.log4j.ConsoleAppender
log4j.appender.STDOUT.layout=org.apache.log4j.PatternLayout
log4j.appender.STDOUT.layout.ConversionPattern=%-5p - %m%n

2. Using custom levels:

  
String resource =
"example.properties";
URL configFileResource =
TestCustomLevel.class.getResource(resource);
PropertyConfigurator.configure(configFileResource);
logger.log(XLevel.TRACE,"test Custom Level TRACE");
logger.log(XLevel.LETHAL,"Lethal One level close");
 

here's the output.

  
TRACE - test Custom Level TRACE
LETHAL - Lethal One level close
 

Hope that helps.

Regards,

[Arvindu]

Thanks Pavan

It is very much helpful

I want my TRACE case come inbetween WARN and ERROR

DEBUG-->INFO-->WARN--->TRACE--->ERROR--->FATAL

Is it possible?

[Pavan Panduga]

sure,
modify your XLevel calss from this

  
  static public final int  TRACE_INT   = Level.DEBUG_INT - 1;

to

  
  public static final int TRACE_INT = Level.WARN_INT + 1;

Regards,

[Arvindu]

Thanks Pavan cool
everything work as i needed..