Hi All
I just dowloaded Log4j and started working on some samples, I have these questions.
1. There are 2 jars in distribution Log4j.jar and Log4j-core.jar do we need both of
these. What is the necessity for 2 jars ?
2. I downloaded Log4j version 1.1.3 eventhough documentation says that there is a
Logger class org.apache.log4j.Logger
I did not find one in either of jars. There is a Category class which I was able to
use. What version of jar has Logger ?
3. Documentation says
" Log4j makes it easy to name loggers by software component. This can be accomplished
by statically
instantiating a logger in each class, with the logger name equal to the fully
qualified name of the class. "
should I put
static Category logger = Category.getInstance(MyClass.class.getName());
at the top of every class and have configuration read like this in say constructor
PropertyConfigurator.configure("d:/dev-web/src/log4j.conf");
Then it will log to all appenders in log4j.conf
Documentation : " it is possible to configure a logger and then to retrieve the same
instance somewhere else in the code without passing around references"
does it mean this logger is available in same class , .... I am clueless on usage
"Can anybody comment why one should require so many loggers one for each class"
I can understand if one module logs to a particular file, why is this logger at class
level.
4.I tried to use sort1.lcf which I got from samples
log4j.rootCategory=, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%-4r %-5p [%t] %37c %3x - %m%n
put this line at top
static Category logger = Category.getInstance(HTTPToXML.class.getName());
I have just one class in my package which extends extends
org.xml.sax.helpers.DefaultHandler i put 2 debug statements
logger.debug("Entering application.");
logger.debug("Exiting application.");
I get this as output...
0 DEBUG [main] com.sentius.webhandler.HTTPToXML - Entering application.
63 DEBUG [main] com.sentius.webhandler.HTTPToXML - Exiting application.
78 DEBUG [main] com.sentius.webhandler.HTTPToXML - Entering application.
78 DEBUG [main] com.sentius.webhandler.HTTPToXML - Exiting application.
I read about appender additivity since there is just one class in my package I dont
know where the duplicates are comming from.
Intrestingly output looks like my method ran twice but this is just a main method
calling init() method a normal java standalone
app.
Any comments....
Replies will be greatly appreciated.
Thanks
Modha/-
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